SlabMate: Concrete Calculator
Slab, footing & bag estimator
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
SlabMate gives tradespeople and DIY users clear concrete estimates without spreadsheets or guesswork.
Choose the type of pour, enter the dimensions, and see the required volume, litres, bag count, waste allowance, estimated weight and cost. An isometric preview helps you catch dimension mistakes before you order or mix.
Use it for slabs, shed bases, paths, post holes, pads, footings, columns, steps and ring bases. The calculator works offline and remains free to use.
Custom bag sizes, prices and mix ratios are free, so estimates use your merchant's real yields and prices.
SlabMate Premium adds saved jobs, editing, duplication and search.
The yearly plan is an auto-renewing subscription unless cancelled at least 24 hours before the end of the current period. Manage or cancel it in Apple Account > Subscriptions. The lifetime option is a one-time purchase and does not renew.
Terms of Service: https://slabmate.underctrl.dev/terms
Privacy Policy: https://slabmate.underctrl.dev/privacy
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Custom bag sizes, prices and mix ratios are now free, so every estimate can use your merchant's real yields and rates. Premium remains saved jobs.
Imperial measurements also read back the way you type them. Switch to feet and inches and the result, the inputs list and the estimate you share all use them, so there is no metric conversion to double-check.
Also in this release:
- Every bag size, price and mix ratio is editable and removable, including the ones SlabMate ships with
- Small pours keep their figures instead of rounding away, and the notes restate the volume in millilitres
- A premix result names what you buy, so the bag count and purchased weight are never read as the concrete required
- Switching measurement system no longer leaves a converted value like "149.9997" sitting in a field
- Unlocking premium now finishes the save or duplicate you asked for, instead of returning you empty-handed
- The site mix ratio appears only when you are mixing on site
- Saved jobs state their volume once, in the unit you chose
- Site mix lists cement alongside sand, aggregate or ballast, and prices bulk bags when they work out cheaper
- Ready-mix quotes your supplier's minimum load rather than a part load
- Clearer warnings for shallow footings, oversized post holes, and pours that need one continuous go
- Optional anonymous usage and issue reporting, switched off by default and controlled in Settings
The developer, Alex Whinfield, 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 Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Alex Whinfield
- Size
- 55.8 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Yearly Premium $4.95
- Lifetime $14.95
- Copyright
- © 2026 Alex Whinfield
