About SlabCalc

Free construction calculators for DIYers and professionals

What We Do

SlabCalc provides free, easy-to-use construction calculators for concrete, gravel, rebar, pavers, and more. Whether you're pouring a patio, building a shed foundation, or planning a driveway, our tools help you calculate exactly how much material you need and what it will cost.

We built SlabCalc because we were tired of doing the same calculations over and over—or worse, guessing and ordering too much or too little material. Our calculators take the math out of construction planning so you can focus on building.

Everything on SlabCalc is free. No accounts, no subscriptions, no paywalls. Just open a calculator, enter your dimensions, and get instant results.

What Makes SlabCalc Different

Built by DIYers, for DIYers

We understand the frustration of unclear instructions and confusing calculators. Our tools are designed to be simple and straightforward.

Real-World Focused

We include practical details like waste factors, bag sizes, and delivery minimums—things that matter when you're actually buying materials.

No Nonsense

Clean interface, no intrusive ads or popups. Just calculators that work and optional resources to help you succeed.

Always Improving

We regularly add new calculators and features based on what people actually need for their projects.

Why Use SlabCalc?

Precision Calculations

Industry-standard formulas for concrete, gravel, rebar, and more. Calculate exactly what you need—no guesswork.

Instant Results

Get material quantities, bag counts, and cost estimates in seconds. No spreadsheets, no complicated math.

100% Free Forever

No subscriptions, no hidden fees, no premium tiers. All calculators and features are completely free.

Works Everywhere

Use on your phone at the hardware store, tablet on-site, or desktop at home. Fully responsive design.

Our Calculators

We offer specialized calculators for every type of construction project:

Concrete Calculators: Slabs, footings, columns, steps, driveways—calculate cubic yards, bags needed, and costs
Material Calculators: Gravel, asphalt, rebar, pavers—get accurate quantities for any project
Specialty Tools: Deck footings, post holes, and custom calculations for unique projects
Cost Estimators: Location-based pricing to help you budget accurately

Each calculator includes helpful tips, waste factors, and practical advice to ensure your project goes smoothly.

DIY Guides & Articles

Beyond calculators, we publish practical guides to help you tackle construction projects with confidence. Learn from expert tips, cost breakdowns, and step-by-step instructions.

Guides

7 Ways DIYers Can Save Money on Concrete Projects in 2025

Discover 7 proven strategies to cut concrete costs without sacrificing quality. Learn how DIYers save hundreds on slabs, patios, and driveways.

Local Concrete Prices: How Much in Your Area?

Discover typical concrete prices by region and learn how to get the best local rates for your project in 2025.

Single Car Driveway Cost: DIY vs Hiring a Pro

Compare DIY and professional costs for a single car driveway. Learn which option saves money and when hiring a pro makes sense.

How to Use SlabCalc

Pick a Calculator: Choose the calculator that matches your project (concrete slab, gravel, rebar, etc.)
Enter Your Measurements: Input length, width, depth, or other dimensions—we support feet, inches, and metric
Get Instant Results: See exactly how much material you need, how many bags to buy, and estimated costs

Head to the Store: Take your results with you and order with confidence

Who Uses SlabCalc?

DIY Homeowners

Weekend warriors tackling patios, driveways, shed foundations, and home improvement projects.

Small Contractors

Independent contractors who need quick estimates for bids and material orders.

First-Time Builders

People planning their first concrete project who need guidance and accurate calculations.

Ready to Calculate Your Project?

Choose a calculator and get instant, accurate results—completely free.

Browse All Calculators