Trades Calculators
BTU Calculator
Estimate the BTUs your room needs based on square footage, ceiling height, sun exposure and number of occupants.
Paint Calculator
Estimate gallons of paint needed for any wall area in square feet, including coats and waste.
Tile Calculator
Calculate the number of tiles needed for a floor or wall, including a configurable waste percentage.
Concrete Calculator
Estimate cubic yards of concrete for slabs, footings and pads in feet and inches.
About our free trades calculators
Fast, accurate calculators for contractors, painters, tilers and concrete pros working in feet, square feet and yards. Whether you are a small business owner, a tradesperson on the job site, a restaurant manager pricing a menu, or a homeowner planning a project, our trades calculators are designed to give you a clear answer fast — with no signup, no paywall, and no data leaving your device.
Every tool in the Trades Calculators category was built around a real-world question we kept seeing online: "How much paint do I need?", "What should my menu price be?", "How do I make a clean invoice?". Instead of forcing you through a long form or a marketing funnel, we give you the calculator or generator at the top of the page and the helpful background information below.
Designed for the US market
Our trades calculators use US units (feet, square feet, inches, gallons, cubic yards, ounces) and US dollars by default, with formulas tuned for typical American homes, contractors, small businesses and restaurants. If you are in Ohio, the Midwest, or anywhere in the United States, the defaults will feel familiar.
Browser-based and private
Every calculation happens locally in your browser using JavaScript. Image and file tools use the HTML canvas API, so your photos and documents never leave your device. That makes the tools fast, private and usable even on slow Wi-Fi.
Always free
All 4 trades calculators on this page will remain free forever. The site is supported by non-intrusive advertising, not by selling your data or hiding the tool behind a paywall.
Tips for using these tools
- Enter realistic numbers — the more accurate your inputs, the more accurate the estimate.
- Always add a buffer for waste or overruns when ordering materials, food or supplies.
- Use the printable outputs (where available) to share results with a client or coworker.
- Bookmark this page so you can come back next time you need the same calculator.
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Frequently Asked Questions
What is included in the Trades Calculators category?
Are these trades calculators free to use?
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Is my data private?
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