Free material calculators
for every DIY project
Know exactly how much to buy. Enter your dimensions and get the exact amount instantly — concrete, mulch, paint, decking and 28+ more.
Want to save your work? Create a free account →
Pick your project
Choose from 33+ calculators — concrete, paint, mulch, decking and more.
Enter your measurements
Type in your dimensions. We do the math in the units suppliers actually sell.
Buy the right amount
Get exact quantities — bags, sheets, boxes, tons — so you never over- or under-buy.
Browse by project type
Jump straight to the calculators for your job.
Popular calculators
View allMore than a calculator
Start free, save your work, and let us handle the measuring and the shopping list.
Explore all featuresSave your projects
Sign up free to save every calculation to a named project, reopen it anytime, and share a link with your crew or contractor.
- Unlimited free calculators
- Save & reopen projects
- Share read-only links
Measure with a photo
Don't want to measure by hand? Snap a photo of your room, wall, or yard and let AI estimate the dimensions, then auto-fill the calculator.
- AI photo measuring
- Auto-fills your calculator
- Works on any device
Smart shopping list
Turn any project into a real shopping list with current big-box prices and total cost — rounded to sellable bags, sheets, and boxes.
- Live material prices
- Total project cost
- Ready to take to the store
Save your first project in seconds
Free account. No credit card. Keep every calculation organized by project.
Instant results
No loading, no ads in your way — type your numbers and see the answer immediately.
Built on real formulas
Industry-standard coverage rates and waste allowances you can plan around with confidence.
Supplier-ready units
Answers in bags, sheets, boxes, cubic yards and tons — exactly how materials are sold.
Free forever to use
Every calculator is free with no sign-up. Create an account only when you want to save.
Get early access to My DIY Calculator Pro
Be first to try AI photo measuring and the smart shopping list with real store prices. No spam — just the launch.
Frequently asked questions
Are the calculators really free?
Yes. Every calculator on My DIY Calculator is 100% free to use, with no sign-up required. You only need a free account if you want to save your projects.
Do I need to create an account?
No — use any calculator instantly. A free account just lets you save projects, reopen them later, and share them.
How accurate are the estimates?
Our formulas use standard industry coverage rates and include waste allowances where appropriate. They're built for confident planning — always confirm final quantities with your supplier.
What's coming in Pro?
Pro adds AI photo measuring, a smart shopping list with real store prices, and branded PDF exports. Join the waitlist to get early access.
My DIY Calculator helps homeowners, DIYers, and contractors figure out exactly how much material a project needs — no guesswork, no overspending, no second trip to the store. Every calculator is free and shows the math in the units suppliers actually use: cubic yards, bags, sheets, boxes, rolls, and tons. Planning a patio, pouring a slab, refreshing a room, or building a deck? There's a calculator for it.