Concrete Calculator
Yards, bags and cost estimator
Free · Designed for iPad. Not verified for macOS.
Estimate concrete in seconds. Six pour shapes, US and metric units, waste allowance, bag counts, ready-mix orders and material cost. Built for the jobsite.
Concrete Calculator gives contractors and serious DIYers fast, accurate concrete estimates for any pour. Enter your dimensions and get cubic yards, cubic meters and bag counts instantly, then share the estimate with your crew, your customer or your supplier.
SIX POUR SHAPES
- Rectangular slabs for patios, driveways, shed floors and pads
- Footings for strip and spread footings
- Round columns, sonotube piers and post holes, with the option to subtract the post
- Poured foundation and retaining walls
- Solid poured stairs with an optional top landing
- Curb and gutter
SIMPLE BY DEFAULT, DETAILED WHEN YOU NEED IT
Each shape shows only the fields you need. Open More Options for quantity, waste allowance, bag size and a full details list: volume before and after waste, cubic feet and cubic meters, approximate weight, the ready-mix order rounded up to the next quarter yard, and truckloads.
BAGS OR READY-MIX
See how many 40, 50, 60 or 80 lb bags a pour needs, or 20, 25 and 30 kg bags in metric. Bag counts use manufacturer yields so your order matches what the store sells.
KNOW THE COST BEFORE YOU ORDER
Enter your supplier's price per yard or per bag and the app shows the estimated material cost for ready-mix or bagged mix.
US AND METRIC
Switch between feet and inches or meters and centimeters at any time. Every field converts exactly, and each dimension has its own unit selector so width can be in inches while length stays in feet.
QUICK SLAB WIDGET
Adjust slab length, width and thickness from your home screen and see yardage and bag counts at a glance. Tap the widget to open the full calculator with those dimensions.
SHARE THE ESTIMATE
One tap produces a plain text summary with the dimensions, volume including waste, bag count, ready-mix order and costs, ready to text or email.
PROFESSIONAL BY DESIGN
A clean, high-contrast layout with six color themes that stay readable in the sun or in the truck. No ads, no account and no subscription.
Estimates are approximate. Confirm quantities with your supplier before ordering.
Ratings & Reviews
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The developer, Zaffles, 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
- Zaffles LLC
- Size
- 1.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 18.5 or later.
- iPhone
Requires iOS 18.5 or later. - iPad
Requires iPadOS 18.5 or later. - Mac
Requires macOS 15.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.5 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Zaffles LLC