Mortar Calculator
Calculate how many bags of mortar mix you need by brick or block count and joint thickness.
How It Works
This calculator estimates mortar quantity based on the number of bricks or blocks and your joint thickness. It uses standard industry ratios for Type S mortar.
Brick ratios: 6 bags (80 lb) per 1,000 bricks with 3/8" joints, or 8 bags per 1,000 bricks with 1/2" joints.
Block ratios: 3 bags (80 lb) per 100 standard 8×8×16 blocks with 3/8" joints, or 4.5 bags per 100 blocks with 1/2" joints.
60 lb bag counts are derived from cubic footage. Each 80 lb bag yields approximately 0.6 cu ft and each 60 lb bag yields approximately 0.45 cu ft of mixed mortar.
Frequently Asked Questions
How many bags of mortar do I need per 1000 bricks?
For standard modular bricks with 3/8" joints, you need approximately 6 bags (80 lb) of Type S mortar per 1,000 bricks. With 1/2" joints, that increases to about 8 bags per 1,000 bricks. Always buy 10-15% extra for waste.
What is the difference between Type S and Type N mortar?
Type S mortar has higher compressive strength (1,800 PSI) and is used for structural walls, below-grade work, and exterior applications. Type N mortar (750 PSI) is used for above-grade, non-load-bearing walls and interior work. Type S is the most common choice for general masonry.
How much mortar do I need for concrete blocks?
For standard 8x8x16 concrete blocks (CMU) with 3/8" joints, plan on about 3 bags (80 lb) of mortar per 100 blocks. With 1/2" joints, you will need approximately 4.5 bags per 100 blocks.
Should I use 60 lb or 80 lb bags of mortar?
80 lb bags are more economical per pound and better for large projects. 60 lb bags are easier to handle and transport, making them a good choice for smaller jobs or when working alone. Both yield the same quality mortar when mixed correctly.
How long does mortar last once mixed?
Mixed mortar is workable for about 90 minutes to 2 hours in moderate conditions. In hot, dry, or windy weather it may stiffen sooner. You can re-temper (add small amounts of water and remix) once, but after 2.5 hours the mortar should be discarded. Mix only what you can use in 1-2 hours.