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Free Business Tools & Calculators

Every free invoice24 tool in one place, built for United States 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 itemized, print-ready receipts for any sale or payment.Estimate 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 Memo Generator →Correct or cancel an already-issued invoice with a referenced credit note, then download as PDF.United States 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 the United States with editable line items, validity dates, sales tax notes, and Word or Excel formats.Quote Template →Download a free quote template for the United States with acceptance terms, expiry dates, sales tax notes, and Word or Excel formats.Proforma Invoice Template →Download a free proforma invoice template for the United States with line items, customs/payment notes, sales tax caution, and Word or Excel formats.Credit Memo Template →Download a free credit memo template for the United States with original invoice reference, reason, sales tax adjustment, and Word or Excel formats.Delivery Note Template →Download a free delivery note template for the United States with delivery address, item quantities, carrier details, signature fields, and Word or Excel formats.Purchase Order Template →Download a free purchase order template for the United States with PO number, supplier details, delivery address, approval fields, and Word or Excel formats.Itemized Invoice Template →Download a free itemized invoice template for the United States with detailed line items, quantities, unit prices, sales tax, totals, and Word or Excel formats.Receipt Template →Create professional receipts for your US business. Add line items, apply sales tax, and download as a clean 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

Sales Tax Calculator →Calculate the correct sales/VAT/GST tax to charge on an invoice.Paycheck Calculator →Calculate gross-to-net salary, tax, and deductions for an employee.Payslip Generator →Generate compliant, itemized payslips for employees each pay period.Hourly Paycheck Calculator →Calculate take-home pay from an hourly rate, overtime, and the full 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 →Estimate the federal tax withholding mismatch that happens when you work two jobs at once in the US, caused by each employer's W-4 assuming it is your only job.Pro Rata Salary Calculator →Calculate prorated salary from full-time pay, weekly hours and part-year work.Bradford Factor Calculator →Calculate an absence-pattern score for HR policy review.PTO Accrual Calculator →Estimate US vacation or PTO allowance from an employer policy, with federal FLSA caveats.FMLA Medical Leave Calculator →Estimate federal FMLA medical leave eligibility and remaining protected weeks.FMLA Parental Leave Calculator →Estimate federal FMLA parental and bonding leave eligibility and remaining protected weeks.Company Car Personal Use Tax Calculator →Calculate the taxable value of personal use of an employer-provided vehicle using the IRS cents-per-mile rule.W-4 Withholding Calculator →Estimate federal tax withholding to fill out Form W-4 correctly.

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 your business →Logo templates for 450+ industries and trades. Customize on the page and download SVG and transparent PNG free — no account, no watermark.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 customizable length and character sets.Word Counter →Count words, characters, sentences, and estimated reading time instantly.Online whiteboard →Open a free online whiteboard for drawing, lessons, brainstorming and quick exports. No install required.Remove Image Background →Automatically remove the background from any photo or product image.Image Resizer →Resize, compress and convert images in your browser — set exact pixels or a target size in KB, with no upload.Color Picker →Pick any color 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.

Conversions & geometry

Square Footage Calculator →Free square footage calculator for rooms, floors, and lots. Enter length and width to instantly get square footage for flooring, paint, or real estate — with a multi-room total.Square Meter Calculator →Free square meter calculator for square, rectangular, circular, and polygon rooms. Get an instant m² figure for flooring, tiling, or paint — enter your shape and dimensions.Square Yards Calculator →Square yards calculator for carpet, turf, and flooring. Enter length and width in feet or metres to get square yards instantly, plus a waste-adjusted quantity and cost.Wall Square Footage Calculator →Calculate wall square footage for paint, wallpaper, or drywall — enter room dimensions and door/window openings for an accurate paintable area and material cost estimate.Cubic Yard Calculator →Cubic yard calculator for gravel, mulch, topsoil, and concrete. Choose your shape, enter dimensions, and get cubic yards plus an estimated delivered material cost.Square Feet to Cubic Yards Calculator →Convert square feet to cubic yards for concrete slabs, mulch, or gravel. Enter area (or length x width) and depth to get the cubic yards you need to order, plus cost.Gallons Per Square Foot Calculator →Gallons per square foot calculator for pools, tanks, and raised beds. Enter area (or length x width) and height/depth to get total gallons and the gal/sq ft coverage rate.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 calculator for wheelchair and ADA-compliant accessibility ramps. Enter rise and choose a slope ratio (e.g. ADA 1:12) to get the required run, ramp length, and grade percent.Miter Angle Calculator →Miter angle calculator for trim, crown molding, and framing corners. Enter the joint angle and board widths to get the exact miter 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 concrete slab calculator: enter length, width and thickness in feet/inches to get cubic yards, bag count or ready-mix order size and a real cost estimate.Concrete Column Calculator →Concrete column calculator: work out concrete volume for round or square columns from diameter/side and height, in cubic yards, with bag count and cost.Concrete Cylinder Calculator →Concrete cylinder calculator for pours and ASTM C39/C31 test cylinders: enter diameter and height (4x8 in / 6x12 in) for volume, bags and material cost.Concrete Block Calculator →US concrete block (CMU) calculator: work out how many 16x8 in blocks and mortar bags you need for a wall, with joint-aware maths and a real cost estimate.Concrete Block Fill Calculator →US CMU core-fill calculator: work out how much grout fills the hollow cores of a standard 8x8x16 in concrete block wall, with bags and material cost. The standard method for reinforced CMU cavity walls in US construction.Cement Calculator →US cement calculator: enter your wet (placed) volume and mix ratio to get cement, sand and aggregate quantities, 94 lb bag count and material cost.Sonotube Calculator →US sonotube calculator: pick a standard tube diameter (6 in - 24 in) and enter height to get concrete volume, bag count and material cost for piers and footings.Rebar Calculator →US rebar calculator: enter slab size and bar spacing (#3-#8, ASTM A615 Grade 60) to get bar count, total weight in lbs and material cost.Brick Calculator →US brick calculator: work out how many modular bricks (7⅝ x 2¼ in actual, 8x2⅔x4 in nominal) you need for a wall, single or double wythe, plus mortar and cost.Retaining Wall Calculator →US 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 →US wall volume and cost calculator: enter wall length, height and thickness for a poured concrete wall, or block/brick size for a masonry wall, to get 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 lb/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 lb/kg and cost estimate.Aluminum Weight Calculator →Calculate the weight of aluminum sheet, plate, round bar or tube by alloy (6061, 5083, 7075 and more). Instant weight in lb/kg and cost estimate.Metal Weight Calculator →Calculate the weight of bar, tube, plate or box stock in steel, aluminum, brass, copper, titanium and more. Instant weight in lb/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 lb/kg and cost estimate.Pipe Weight Calculator →Calculate pipe or tube weight from outer diameter, wall thickness (or bore) and length. Instant weight in lb/kg and cost estimate.Lumber Weight Calculator →Calculate the weight of dimensional lumber (2x4, 2x6, 2x8 and more) from length, width, thickness and species, adjusted for moisture state.Log Weight Calculator →Calculate the weight of a tapered round log from its small-end/large-end diameters, length and species, adjusted for moisture state.Concrete Weight Calculator →Calculate the weight of a concrete pour from its volume or dimensions, by concrete type. Instant weight in lb/tons 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 custom density.

Surfaces & finishes

Flooring Calculator →Calculate how much flooring you need for a room in square feet, 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.Thinset Calculator →Calculate how many bags of thinset mortar you need for a tile job, with thickness and trowel-notch size looked up by tile size.Drywall Calculator →Calculate how many drywall sheets you need for a room from wall/ceiling area, door and window openings, panel size and waste allowance.Wallpaper Calculator →Calculate how many rolls of wallpaper you need for a room, using the standard US double roll size and pattern repeat.Paint Calculator →Calculate how many gallons 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 (caulk) 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 asphalt shingle, metal, tile or membrane roofing.Roof Shingle Calculator →Calculate how many bundles and squares of asphalt shingles you need from your roof’s footprint, pitch and material coverage.