Mortar Bags Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the number of bricks or blocks.
- Adjust bricks-per-bag if your mix differs from ~30.
How it works
Bags = bricks ÷ bricks laid per bag, rounded up. A 20 kg bag lays roughly 30 standard bricks.
Worked example
1000 bricks. ≈ 34 bags at 30 bricks per bag.
Common mistakes
- Joint thickness and brick size change the yield a lot — adjust bricks-per-bag.
- Not allowing ~10% spare for waste and spillage.
Frequently asked questions
How many bricks does a bag of mortar lay?
Roughly 30 standard bricks per 20 kg bag, but it varies with joint size and brick type.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.