Free Construction Calculators
Estimate any construction project in seconds. No signup, no fees, mobile-friendly.
Browse by category
Eight trades covered, with more calculators added every week.
Popular calculators
The ten tools people reach for most.
Why CalcWright
Free forever
No paywall, no account, no trial that expires. Run any calculator as many times as you need.
Accurate math
Built on published construction standards and manufacturer specs. We show what we assumed so you can adjust.
Mobile-friendly
Designed for the job site. Big touch targets and a layout that works one-handed on a phone.
How it works
Pick a calculator
Find your tool by category or search. Roofing, concrete, fencing, and more.
Enter your numbers
Type your measurements. Each field has a tip if you're not sure what it wants.
Get your estimate
See the result instantly. Copy it, or share a link with your numbers built in.
Common questions
Are CalcWright's calculators really free?
Yes. Every calculator is free, with no signup and no limit on how often you run it. We make money from ads on the page, not from you.
Do I need to download or install anything?
No. They run right in your browser on a phone or laptop. There's nothing to install.
How accurate are the estimates?
The math uses standard industry formulas. But waste, site conditions, and local pricing all vary, so treat the number as a strong starting point. Confirm with your supplier or a licensed pro before you buy.
Can I use these on the job site?
That's the point. The layout is built for phones first, so you can pull up a calculator one-handed standing in the driveway.
Where do your formulas come from?
Published construction standards and manufacturer specs. Where a calculation needs a judgment call like waste factor, we tell you what we assumed so you can change it.
Can I share a result with someone?
Yes. Each calculator builds a shareable link with your numbers baked in, so you can text it to a client or crew and they'll see the same result.
About CalcWright
CalcWright started with a simple frustration: most construction calculators online are buried in popups, ask you to register, or hand you a number with no idea where it came from. We wanted the opposite — free tools that load fast, work on a phone, and show their work.
Every calculator here covers a real task a contractor or homeowner runs into, like squaring up a roof, ordering asphalt, or figuring out how much sod to buy. The formulas come from published construction standards and manufacturer specs, not guesswork. When a calculation depends on a judgment call, such as how much waste to add, we say so and let you change it.
We're builders and estimators who got tired of doing the same back-of-the-napkin math twice. CalcWright is run by the CalcWright Team, and we update the tools as codes and prices shift. One thing we'll always be upfront about: these are estimates. They'll get you a tight number for planning and ordering, but they don't replace a licensed professional signing off on the real thing.