# SlabMate: Concrete Calculator — Slab, footing & bag estimator

> Slab, footing & bag estimator (iPhone/iPad app by Alex Whinfield.)

- Source: https://appshunter.io/ios/app/slabmate-concrete-calculator/id6793449418 (this page in markdown: same URL + `.md`)
- Developer: [Alex Whinfield](https://appshunter.io/developer/6793449420)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 53 MB
- Languages: American English
- Released: 2026-08-04
- Data updated: 2026-08-22
- User reviews in markdown: https://appshunter.io/ios/app/slabmate-concrete-calculator/id6793449418/reviews.md

## What is SlabMate?

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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly Premium | $4.95 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime | $14.95 | one-time |



## Version history (last 2 releases)

### 1.0.1 — 2026-08-19

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

### 1.0.0 — 2026-08-05

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-22.*