Free Business Tools & Calculators
Every free invoice24 tool in one place, built for Australia businesses — invoicing, payroll, tax calculators, converters, PDF tools, and generators. All free, no sign-up required.
Invoicing & Documents
Invoice Generator →Create and send professional invoices, free, no sign-up required.Receipt Generator →Generate itemised, print-ready receipts for any sale or payment.Quote Generator →Create a professional quote or estimate to send to a prospective client.Quote Generator →Create a firm, fixed-price quote or quotation a client can accept, then download as PDF.Credit Note Generator →Correct or cancel an already-issued invoice with a referenced credit note, then download as PDF.Australia Purchase Order Generator →Create and send purchase orders to suppliers, tracked and print-ready.Expense Report Generator →Log business expenses and generate an expense report for reimbursement or accounting.Invoice Templates →Free, downloadable invoice templates in Word, Excel, and PDF.Estimate Template →Download a free estimate template for Australia with editable line items, validity dates, GST notes, and Word or Excel formats.Quote Template →Download a free quote template for Australia with acceptance terms, expiry dates, GST notes, and Word or Excel formats.Proforma Invoice Template →Download a free proforma invoice template for Australia with line items, customs/payment notes, GST caution, and Word or Excel formats.Credit Note Template →Download a free credit note template for Australia with original invoice reference, reason, GST adjustment, and Word or Excel formats.Delivery Note Template →Download a free delivery note template for Australia with delivery address, item quantities, carrier details, signature fields, and Word or Excel formats.Purchase Order Template →Download a free purchase order template for Australia with PO number, supplier details, delivery address, approval fields, and Word or Excel formats.Itemized Invoice Template →Download a free itemized invoice template for Australia with detailed line items, quantities, unit prices, GST, totals, and Word or Excel formats.Receipt Template →Create professional receipts for your Australian business. Add line items, include GST, and download as a PDF — free, no sign-up required.Document Templates →Fill-in legal and business document templates — free Word and PDF downloads, no sign-up.Invoice Templates by Industry →Download industry-specific invoice templates in Google Sheets, Google Docs, Excel, and Word.Invoice Generators by Industry →Invoice generators tailored field-by-field to your specific trade or profession.E-Signature →Sign documents electronically or collect signatures from clients online.
Payroll & Tax Calculators
GST Calculator →Calculate the correct sales/VAT/GST tax to charge on an invoice.Salary Calculator →Calculate gross-to-net salary, tax, and deductions for an employee.Payslip Generator →Generate compliant, itemised payslips for employees each pay period.Hourly Pay Calculator →Calculate hourly take-home pay, overtime, and the total employer cost.Income Tax Calculator →Estimate personal income tax owed based on income and allowances.Corporation Tax Calculator →Calculate corporation/company tax owed on business profits.Two Jobs Tax Calculator (Australia) →Use this two jobs tax calculator to see how claiming the tax-free threshold at only one employer affects PAYG withholding when you work two jobs in Australia.Pro Rata Salary Calculator →Calculate pro-rata salary from full-time pay, weekly hours and part-year work.Bradford Factor Calculator →Calculate an absence score from absence events and total days absent.Annual Leave Calculator →Estimate Australian annual leave under the National Employment Standards.Sick Pay Calculator →Estimate Australian paid sick and carer's leave accrual and pay under the NES.Parental Leave Pay Calculator →Estimate Australian Paid Parental Leave days and pay at the current Services Australia rate.Fringe Benefits Tax Calculator →Estimate Australian FBT from type 1 and type 2 benefits plus a simple car fringe benefit.ABN Lookup →Look up and verify an Australian Business Number (ABN).
Project & Time Tracking
Project Cost Calculator →Estimate total project cost from labour, materials, and overheads.Revenue Forecaster →Forecast future revenue based on historical growth and trends.Work Hours Calculator →Calculate total hours worked between a start and end time.Time Card Calculator →Total up weekly time card hours for payroll, including overtime.Timesheet Template →Log hours, breaks and overtime with automatic totals — no sign-up.
Business Calculators
Margin Calculator →Work out profit margin, markup, and selling price from cost and margin percentage.Percentage Calculator →Calculate percentages, percentage change, and percentage of a total instantly.Loan Calculator →Estimate monthly repayments, total interest, and amortisation for any loan.Investment Calculator →Project mutual fund and investment growth with compounding returns over time.Mortgage Calculator →Calculate mortgage repayments, interest, and amortisation schedules.Home Loan Amortisation Calculator →See your full amortisation schedule, compare repayment methods, and model extra payments.Date Calculator →Add, subtract, or find the difference between dates in days, weeks, or months.Timber Conversion Calculator →Calculate timber volume, cut lists, log scaling, and firewood conversions.
Converters & Lookup Tools
Currency Converter →Convert between world currencies using live exchange rates.Unit Converter →Convert length, weight, volume, area, temperature, and more between units.Timezone Converter →Compare times across timezones and find overlapping working hours.BSB Number Lookup →Look up bank routing, sort, or SWIFT/IBAN codes for domestic and international transfers.
PDF Tools
Edit PDF →Add text, images, and annotations to any PDF directly in your browser.Watermark PDF →Add text or logo watermarks to PDF files in your browser, with no upload.Merge PDF →Combine multiple PDF files into a single document in seconds.Split PDF →Extract specific pages or split a PDF into multiple separate files.Compress PDF →Reduce PDF file size for easier sharing and emailing without losing quality.PDF to Word →Convert a PDF into an editable Word (.docx) document.PDF to Excel →Extract tables and data from a PDF into an editable Excel spreadsheet.Word to PDF →Convert a Word document into a shareable, print-ready PDF.JPG to PDF →Combine one or more JPG images into a single PDF file.PDF to JPG →Convert each page of a PDF into a high-quality JPG image.
Generators & Design Tools
QR Code Generator →Create a free QR code for a URL, Wi-Fi network, contact card, or plain text.Barcode Generator →Create free EAN, UPC, Code 128, GS1-128, QR, DataMatrix and print-ready barcode labels.Logo Maker →Design a professional logo for your business in minutes, no design skills needed.Logo templates for tradies and small business →Logo templates built for Australian tradies and small businesses. Edit on the page, see it on a ute door, download SVG and PNG free — no sign-up.Business Card Maker →Create and download print-ready business cards with your branding.Business Name Generator →Generate unique, available business name ideas for your new venture.SKU Generator →Generate consistent, structured SKU codes for your product inventory.Random Number Generator →Generate random numbers within a custom range for draws, samples, or testing.Password Generator →Create strong, random passwords with customisable length and character sets.Word Counter →Count words, characters, sentences, and estimated reading time instantly.Online whiteboard →Use a free online whiteboard for teaching, tutoring, planning and brainstorming in your browser.Remove Image Background →Automatically remove the background from any photo or product image.Resize Image →Resize, compress and convert images in your browser — set exact pixels or a target size in KB, with no upload.Colour Picker →Pick any colour from an image and get instant HEX, RGB, HSL, HSV and CMYK codes.Email Signature Generator →Create a professional HTML email signature and copy it straight into Gmail or Outlook.QR Code Scanner →Scan a QR code from your camera, screenshot, or image.
Finance & Reporting
Conversions & geometry
Square Footage Calculator →Free square footage calculator for Australian rooms, floors, and property listings. Enter length and width to get square footage instantly for flooring, paint, or real estate.Square Metre Calculator →Free square metre calculator for Australian rooms — square, rectangular, circular, or polygon. Get an instant m² figure for flooring, tiling, or paint quotes.Square Yards Calculator →Convert square metres to square yards — useful when comparing US-sourced carpet or turf pricing. Enter your room size to get an instant square-yard conversion.Wall Square Metre Calculator →Calculate wall square metres for paint, wallpaper, or plasterboard — enter room dimensions and door/window openings for an accurate paintable area and cost estimate.Cubic Yard Calculator →Convert cubic yards to cubic metres for gravel, mulch, topsoil, or concrete. Choose your shape and enter dimensions for an instant volume conversion.Square Feet to Cubic Yards Calculator →Convert square feet to cubic yards (and m² to m³) for concrete slabs, mulch, or gravel. Enter area and depth to get the volume you need in either unit system.Gallons Per Square Foot Calculator →Work out pool, tank, or raised-bed fill volume in litres per square metre. Enter area (or length x width) and depth for an instant fill volume and cost estimate.Elevation Grade Calculator →Free elevation grade calculator: enter rise and run to get slope grade percentage, ratio, and angle of elevation — for driveways, drainage, ramps, and site grading.Ramp Slope Calculator →Ramp slope and gradient calculator for wheelchair and accessibility ramps. Enter rise and choose a slope ratio (e.g. AS 1428.1 guidance) to get the required run and ramp length.Mitre Angle Calculator →Mitre angle calculator for trim, cornice, and framing corners. Enter the joint angle and board widths to get the exact mitre saw cut angle for each board.Angle Cut Calculator →Angle cut calculator for knee braces and diagonal supports. Enter plank thickness and the two leg distances to get the cutting angle and required plank length.Angle of Depression Calculator →Angle of depression calculator: enter vertical drop and horizontal distance to find the angle below horizontal for a line of sight — useful for surveying and site planning.Taper Calculator →Taper calculator for machining and woodworking: enter major diameter, minor diameter, and taper length to get the taper angle and taper ratio (e.g. 1:x).Rolling Offset Calculator →Rolling offset calculator for pipefitters: enter roll, set, and fitting angle to get the true offset, travel (cut length), and run for angled pipe around obstructions.
Concrete & masonry
Concrete Slab Calculator →Free Australian concrete slab calculator: enter length, width and thickness in metres to get volume in m³, bag count or ready-mix order size and a real cost estimate.Concrete Column Calculator →Australian concrete column calculator: work out concrete volume for round or square columns (posts, piers) from diameter/side and height, with bag count and cost.Concrete Cylinder Calculator →Australian concrete cylinder calculator: for pours or standard AS 1012 test cylinders — enter diameter and height for volume in m³/litres, bags and cost.Concrete Block Calculator →Australian concrete block calculator: work out how many 390x190mm blocks (Besser block) and mortar bags you need for a wall, with a real cost estimate.Concrete Block Fill Calculator →Australian core-fill calculator for reinforced Besser (concrete masonry) block walls: work out grout fill volume for 390x190mm block cores, bags and cost. Used mainly for reinforced retaining walls and boundary walls rather than typical veneer construction.Cement Calculator →Australian cement calculator: enter your wet (placed) volume in m³ and mix ratio to get cement, sand and aggregate quantities, 20kg bag count and cost.Concrete Column Formwork Calculator →Australian concrete column formwork calculator (US "sonotube" equivalent): pick a tube diameter and enter height to get concrete volume, bags and cost.Rebar Calculator →Australian rebar calculator: enter slab size and N-bar spacing (AS/NZS 4671, N10-N24, grade 500N) to get bar count, total weight in kg and material cost.Brick Calculator →Australian brick calculator: work out how many 230x110x76mm modular bricks you need for a veneer or cavity wall, plus mortar quantities and real cost.Retaining Wall Calculator →Australian retaining wall calculator: work out how many segmental wall blocks you need plus gravel backfill volume and weight, with a real material cost estimate.Wall Volume & Cost Calculator →Australian wall volume and cost calculator: enter wall length, height and thickness for a poured wall, or block/brick size for a masonry wall, to get cost.
Aggregates & earthworks
Gravel Calculator →Work out how much gravel, road base or blue metal you need by area and depth. Get volume, weight in tonnes and an instant cost estimate for driveways and paths.Sand Calculator →Work out how much washed river sand or concrete sand you need by area and depth. Get volume, weight in tonnes and an instant cost estimate.Crushed Stone Calculator →Calculate how much crushed stone, road base or blue metal you need for a driveway or sub-base. Instant volume, weight in tonnes and cost.River Rock Calculator →Calculate how much decorative river pebbles or scoria you need to cover a garden area. Get volume, weight in tonnes and cost.Limestone Calculator →Calculate how much crushed limestone you need for a driveway, path or sub-base. Get volume, weight in tonnes and an instant cost estimate.Asphalt Calculator →Calculate how much asphalt you need for a driveway or path, accounting for compaction. Get tonnage and an instant cost estimate.Jointing Sand Calculator →Calculate how much bedding sand and jointing sand you need for block paving or a paver patio. Get volume, weight and cost.French Drain Calculator →Plan a French drain (ag drain) from trench dimensions: gravel backfill volume, slotted pipe run length and filter fabric area, plus cost.
Weights
Steel Weight Calculator →Calculate the weight of round bar, rebar, tube or rectangular steel stock from its dimensions and grade. Instant weight in kg and cost estimate.Steel Plate Weight Calculator →Calculate the weight of a rectangular, circular or ring steel plate from its dimensions and grade. Instant weight in kg and cost estimate.Aluminium Weight Calculator →Calculate the weight of aluminium sheet, plate, round bar or tube by alloy. Instant weight in kg and cost estimate.Metal Weight Calculator →Calculate the weight of bar, tube, plate or box stock in steel, aluminium, brass, copper and more. Instant weight in kg and cost estimate.Glass Weight Calculator →Calculate the weight of a glass sheet, panel or rod by shape, thickness and glass type. Instant weight in kg and cost estimate.Pipe Weight Calculator →Calculate pipe or tube weight from outer diameter, wall thickness (or bore) and length. Instant weight in kg and cost estimate.Timber Weight Calculator →Calculate the weight of dimensional timber (90x45 and other dressed sizes) from length, width, thickness and species, adjusted for moisture state.Log Weight Calculator →Calculate the weight of a tapered round log from its diameters, length and species, adjusted for green, air-dried or kiln-dried moisture.Concrete Weight Calculator →Calculate the weight of a concrete pour from its volume or dimensions, by concrete type. Instant weight in kg/tonnes and cost estimate.Size to Weight Calculator (Rectangular Cuboid) →Calculate the weight of any rectangular box or cuboid from its length, width and height, using a built-in materials density table or your own value.
Carpentry & framing
Stud Wall Calculator →Calculate the number of 90x45mm ("4x2") timber studs, plates, and corner studs for a stud wall. 450mm/600mm centres per AS 1684.Rafter Length Calculator →Calculate rafter length from rise, run, and overhang, plus rafter count for your roof.Roof Truss Calculator →Calculate rafter/top-chord length and truss count for your roof, with material and installation cost.Stair Calculator →Calculate step count, riser height, tread depth, and stringer length for your staircase, checked against NCC guidance.Spiral Staircase Calculator →Calculate step count, tread angle, handrail length, and headroom clearance for a spiral staircase.Spindle Spacing Calculator →Calculate spindle (baluster) count and spacing for a deck or stair railing, checked against a 100mm maximum gap convention.Wood Beam Span Calculator →Check a timber beam span against deflection, bending, and shear limits per AS 1720 (Timber Structures).Floor Joist Calculator →Calculate floor joist count and cost, or find the maximum allowable span, per AS 1720 (Timber Structures).Plywood Calculator →Calculate how many plywood sheets you need, using the standard 2440x1220mm metric sheet size.Roof Pitch Calculator →Convert roof rise and run into pitch as a percent grade, degrees, or ratio, plus rafter length.
Structural
Beam Deflection Calculator →Calculate maximum beam deflection for simply-supported or cantilever beams, with a deflection-limit pass/fail check.Beam Load Calculator →Calculate support reactions, shear force, and bending moment for a simply-supported beam carrying multiple point loads.Bending Stress Calculator →Calculate bending stress or applied moment using the flexure formula for common cross-sections, with a utilization-ratio check.Snow Load Calculator →Calculate roof snow load per AS/NZS 1170.3, applicable to Australia’s alpine and sub-alpine regions, with a roof-capacity pass/fail check.
HVAC, energy & flow
CFM Calculator →Work out the ventilation airflow you need in CFM or m³/h for any room, based on recommended air changes per hour.Air Changes Per Hour Calculator →Work out the ACH a room is actually getting from its size and measured airflow, and check it against the recommended target.Heat Loss Calculator →Calculate a room’s fabric heat loss in watts to size a heater correctly, using U-values in line with NCC energy-efficiency practice.Air Con Size (BTU) Calculator →Find the right air con size in BTU/hr and kW for your room from its floor area, sunlight, ceiling height and occupancy.Insulation Calculator →Calculate the total R-value and U-value (W/m²K) of a multi-layer wall, roof or ceiling insulation build-up.Gallons Per Minute (GPM) Calculator →Convert flow rate between gallons per minute and litres per minute, or solve for volume or time from a known flow rate.Pipe Volume Calculator →Calculate the internal fluid volume and liquid mass of a straight pipe from its inner diameter, length and liquid density.Tank Volume Calculator →Calculate the total and partial-fill capacity of a vertical cylinder, horizontal cylinder, rectangular or capsule-shaped tank, in litres.
Surfaces & finishes
Flooring Calculator →Calculate how much flooring you need for a room in m², with material-specific waste allowance and total cost.Tile Calculator →Calculate how many tiles and boxes you need for a floor or wall, including grout gap, layout pattern and waste allowance.Grout Calculator →Calculate how many bags of grout you need for a tiled area from tile size, joint width and depth, and grout type.Tile Adhesive Calculator →Calculate how many bags of tile adhesive you need for a tiling job, with thickness looked up by tile size.Plasterboard Calculator →Calculate how many plasterboard sheets you need for a room from wall/ceiling area, door and window openings, sheet size and waste allowance.Wallpaper Calculator →Calculate how many rolls of wallpaper you need for a room, using the standard EU roll size (0.53 x 10.05 m) and pattern repeat.Paint Calculator →Calculate how many litres of paint you need for a room from wall area, number of coats and coverage rate.Epoxy Calculator →Calculate how much epoxy resin and hardener you need for a rectangular or circular surface, at any mix ratio and coating thickness.Sealant Calculator →Calculate how many tubes or cartridges of sealant you need for a joint or gap from its length, width and depth.Roofing Calculator →Calculate your roof’s sloped surface area from its footprint and pitch, then estimate material and cost for tile, metal (Colorbond) or membrane roofing.Roof Shingle Calculator →Calculate how many bundles of asphalt shingles you need for a roof (an imported roofing style in Australia, distinct from the more common tile/metal roof).
Outdoor & fencing
Fence Calculator →Work out how many fence posts, rails, pickets and concrete for footings you need for your Australian fence, plus total material cost in AUD.Fence Picket Calculator →Calculate exactly how many fence pickets you need from picket width and gap spacing, plus material cost in AUD.Board on Board Fence Calculator →Calculate posts, rails and overlapping boards for a board-on-board privacy fence, plus material cost in AUD.Decking Calculator →Calculate how many decking boards and fasteners you need for your deck, plus material cost in AUD.Block Paving Calculator →Calculate how many paving blocks or pavers you need for a driveway or patio from area and block size, including waste allowance and installed cost in AUD.Pool Volume Calculator →Calculate your swimming pool volume in litres or cubic metres and an estimated water-fill cost in AUD.Round Pen Calculator →Work out how many fence panels you need for a round pen from its diameter and panel length, plus cost in AUD.
Mechanical & electrical
Thread Calculator →Calculate metric screw thread geometry — pitch diameter, minor diameter and ISO 965 tolerances — from major diameter and pitch.Thread Pitch Calculator →Work out metric thread pitch from a measured length and thread count, and match it to the nearest standard ISO metric size.Bolt Torque Calculator →Calculate bolt tightening torque from clamping force using K-factor, diameter and lubrication factor, with an ISO 898-1 torque table.Welding Calculator →Calculate fillet or butt weld load capacity from leg size, length and base-metal strength, with a typical callout cost in AUD.Box Fill Calculator →Check an electrical enclosure against its rated fill capacity from conductor count, gauge, devices and grounds — AS/NZS 3000 framing for Australia.
Contractor status & IR35-style calculators
PSI Tax Calculator →See the real dollar cost of the PSI rules applying: compare tax as a Personal Services Business vs PSI-attributed income, including lost deductions, for FY2026-27.PAYG Take-Home Pay Calculator →Work out take-home pay from a PAYG salary: income tax, Medicare Levy and 12% super guarantee for the 2026-27 financial year.Sole Trader (ABN) Tax Calculator →Estimate income tax, Medicare Levy and GST obligations on ABN sole-trader income for FY2026-27, with a PSI-rules warning built in.ABN vs TFN Calculator →Compare the same income on an ABN (sole trader) vs a TFN (PAYG employee): tax, Medicare Levy, super and leave value side by side.Super Guarantee Charge (SGC) Exposure Calculator →Estimate the SGC exposure — shortfall, 10% nominal interest and penalties — if a contractor engagement is reclassified as employment.Attributed PSI Calculator →See what happens when PSI is attributed to you personally: entity income, limited deductions and the resulting individual tax at marginal rates.Income Splitting & Trust Distribution Calculator →Model splitting income with a spouse or family trust, with PCG 2021/4 risk-zone and s100A guardrails flagged for FY2026-27.
Contract vs. permanent comparisons
Salary to Contractor Rate Calculator →Convert a permanent salary into an equivalent day or hourly contracting rate, accounting for tax, super, leave and utilisation.Day Rate to Salary Calculator →Convert a contractor day or hourly rate into an honest equivalent salary, factoring in lost super and leave value.Contract Comparison Calculator →Compare two contractor offers side by side — rate basis, super, GST and hours — with a break-even rate and annual take-home verdict.Salary Comparison Calculator →Compare two permanent salary offers after tax, Medicare Levy and super to see which is really worth more per year.Labour-Hire Contractor Take-Home Calculator →Model take-home pay through a labour-hire or payroll-services company, including their fee, payroll tax pass-through and super.
Contractor payroll & dividend tax
Medicare Levy & Super Guarantee Calculator →One combined view of Medicare Levy, Medicare Levy Surcharge and 12% Super Guarantee on your income.Franking Credits Calculator →Work out the actual extra tax or refund on a franked dividend at your marginal rate, including the 25% base-rate-entity company rate.
Small business & VAT
Contractor financial planning
Self-Employed Borrowing Power Calculator →Estimate borrowing power from ABN/company income using 2-year NOA averaging, add-backs and lender shading.Mortgage Repayment Calculator →See a mortgage repayment as a % of your after-tax income, with a buffer-months view for variable contractor income.Self-Employed Super Calculator →Plan concessional super contributions within the $32,500 cap and 5-year carry-forward, and see the tax saved at your marginal rate.Life Insurance Needs Calculator →Work out how much life cover you need, with a contractor-specific view of business debts and lost revenue instead of sick leave.Contractor Financial Health Check →Score your position across tax set-aside, GST owing, super gap, buffer months and insurance in one contractor financial profile.Employee Financial Health Check →See take-home pay, super vs age benchmark, savings rate and buffer months combined into one personalised financial score.
Target income & budget impact
Target Day Rate Calculator →Work backwards from the after-tax income you want to the day or hourly rate you need to charge, including GST and super.Net to Gross Salary Calculator →Solve for the gross salary needed to hit a target take-home amount, accounting for tax, Medicare Levy and super.Federal Budget Tax Calculator →Compare your tax under last financial year, this financial year and the legislated future rate cuts, on your own income.Late Payment Interest Calculator →Estimate interest on an overdue invoice using common state penalty-interest benchmarks, since Australia has no single national B2B rate.
