Mortar calculator
How much mortar do I need?
Estimate the number of 60-lb bags of mortar for brick or concrete block projects based on the number of units.
Mortar calculator
Mortar calculator result
Mortar mixing tips
Use a mortar mixing paddle and bucket for small batches. Add water gradually while mixing until the mortar reaches a peanut butter consistency. Mortar has a working time of about 2-3 hours, so mix only what you can use in that time. Keep mortar from freezing for 24-48 hours after application.
Worked example
For example, for 500 bricks, using Type S mortar:
- 500 bricks × 0.02 cu ft per brick = 10 cu ft of mortar
- 60-lb bags: 10 ÷ 0.75 = 13.3 → 14 bags needed
- For blocks: 500 blocks × 0.38 cu ft = 190 cu ft → 254 bags
- Add 1-2 extra bags for waste and buttering
Common mistakes
| Mistake | Why it matters |
|---|---|
| Mixing too much at once | Mortar sets in 1.5-2.5 hours — only mix what you can use in that time |
| Using the wrong mortar type | Type N for above-grade walls, Type S for below-grade or retaining walls |
| Adding too much water | Stiff mortar holds brick in place — wet mortar causes bricks to slide out of alignment |