90 free calculators · no sign-up
Free calculators that do the math for you
Stop guessing. Measurely turns your numbers into exact answers — concrete yardage, GPA, Etsy profits, paint gallons, ROAS — in seconds, in imperial or metric.
Categories
Three categories, ninety tools
Construction, academic, and ecommerce — every tool held to the same bar: real math, documented assumptions, and results you can verify.
Construction30 calculators across 15 project areas — concrete, roofing, flooring, framing, HVAC, and more.Explore tools Academic30 calculators — GPA, grades, final exams, SAT/ACT, study planners, and classroom tools.Explore tools Ecommerce30 calculators — Etsy, Amazon, eBay, and Shopify fees, profit, pricing, and marketing metrics.Explore tools
Most used
Featured calculators
Concrete CalculatorEstimate cubic yards and pre-mix bags for slabs, footings, columns and piers.ConcreteSquare Footage CalculatorArea of rectangles, circles, triangles, and L-shapes — in ft², m², yd², and acres.AreaPaint CalculatorGallons, wall area, and primer — from room dimensions or total area.PaintingRoofing CalculatorEstimate roofing squares, underlayment rolls, drip edge, and ridge cap for gable or hip roofs.RoofingTile CalculatorTile counts, thinset bags, and grout — sized to your tile and layout.FlooringFence CalculatorEstimate pickets, posts, rails, and concrete bags for any wood fence run.FencingBTU CalculatorEstimate the heating or cooling load of any room in BTU/hr from its size, climate, and insulation.HVACStair CalculatorLay out stair risers, tread depth, stringer length, and stair angle from total rise and run.Stairs
How it works
Measurements in, material lists out
Pick your calculator
Search or browse 90 purpose-built tools — each one solves a single real-world math problem, nothing generic.
Enter your measurements
Type in feet, inches, meters, or centimeters. Inputs are validated on the spot so a typo can't silently wreck your order.
Get an exact material list
See yardage, bag counts, gallons, or board feet instantly — with the formula shown, so you can trust and verify every number.
Browse by project area
Frequently asked questions
Yes — every calculator on Measurely is free to use, with no account, no sign-up, and no usage limits. We are preparing the site for Google AdSense, which is how the tools stay free; you will never hit a paywall in the middle of a calculation.
Yes. Every construction calculator supports both imperial and metric inputs — enter feet, inches, meters, or centimeters, and results adapt accordingly. We built for US, UK, Canadian, and Australian audiences, so you can work in whatever units your project uses.
The math is exact for the dimensions you enter, and material-specific guidance (like standard waste factors or bag yields) is stated as a labeled rule of thumb on each tool page. Every calculator also lists its assumptions and limitations, so you know exactly what the number includes — and what it doesn't.
No. Measurely results are planning estimates meant to help you budget and order materials. Anything involving structure, HVAC sizing, stairs, roofing, or building codes should be verified by a licensed professional against your local codes before you build or buy.
Your next project starts with a number you can trust
Ninety free calculators. Zero sign-ups. Exact math in seconds.