Slab: Concrete Calculator
Rebar, cement & cost estimator
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Slab turns the numbers on your tape measure into exactly how much material to order — and what it costs — fully offline, right on the jobsite.
Pick what you're pouring, enter your dimensions in feet-and-inches (12' 6 1/2") or metric, set your waste %, and get a big, legible answer you can trust: cubic yards or cubic meters, bag counts for 40, 50, 60 and 80-lb bags, ready-mix trucks, rebar bar count and tonnage, block and mortar, gravel tons. Bag counts always round up to full bags, so you never come up short.
WHY CREWS PAY ONCE FOR SLAB
• A real dollar quote. Add your unit cost per bag, per yard, per ton or per foot of rebar and Slab gives you a line total and a project total — an estimate you can hand a client or text to the supplier.
• Saved projects. Keep a whole job in one place — slab + footing + gravel base + rebar — with running material and cost totals across every area.
• Every material a crew pours. Slab, footing, wall, columns (rectangular and round/Sonotube-style), stairs, rebar, CMU block + mortar, gravel and soil.
• Feet-inches the way you read a tape — and clean metric for the rest of the world.
• Results that never get cut off. Big tabular numbers that scale with your text size and never truncate.
• Share a clean quote. Export a tidy PDF or text summary through the share sheet — generated offline.
PAID ONCE. OWNED FOREVER.
No subscription, ever. No ads. No account, no sign-up. Your projects stay on your device — data not collected. Works fully offline, in airplane mode, in a basement with no signal.
FREE TO TRY
The Slab and Gravel calculators are free for unlimited ad-hoc calculations. Unlock once to add every other material, dollar cost quotes, saved projects, and PDF/text export.
Built for concrete, masonry and hardscape crews, owner-operators, foremen, and DIY-pros doing a pour.
Minor improvements.
The developer, Laure Shin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Laure Shin
- Size
- 989.2 KB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 2 more
- English, French, Korean
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Slab Pro $4.99
- Copyright
- © 2026 Laure Shin