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Mortar Calculation in Brickwork

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Size of brick with Mortar = 20 cm × 10 cm × 10 cm

No. of bricks required per 1 m3 brickwork = 1 / (0.2 × 0.1 × 0.1) = 500 nos.

No. of bricks for 10 m3 brickwork = 500 × 10 = 5000 nos.
Size of brick without Mortar = 19 cm × 9 cm × 9 cm
Actual volume of 5000 bricks = 5000 × (0.19 × 0.09 × 0.09) = 5000 × 0.001539 = 7.695 m3
approx 7.7 m3


Volume of mortar = 10 – 7.7 = 2.3 m3
Adding 10% wastage = 2.3 + 2.3 × 10% = 2.53 m3
Adding 25% for dry mortar weight (Dry mortar weight > wet mortar weight)
Volume of dry mortar = 2.53 + 2.53 × 25% = 3.16 m3
approx 3.2 m3

Now,
For 1: 6 cement mortar,
Volume of cement = 3.2 / 7 = 0.45 m3
Volume of sand = 3.2 – 0.45 = 2.7 m3
1 m3 OPC (Ordinary Portland Cement) = 1440 kg
Weight of 1 bag of cement = 50 kg
Volume of 1 bag of cement = 50 / 1440 = 0.0347 m3
For 10 m3 of brickwork, no. of cement bags needed = 0.45 / 0.0347 = 12.97
approx 13 bags

Similarly,
For 1: 5 cement mortar,
Volume of cement = 3.2 / 6 = 0.53 m3
Volume of sand = 3.2 – 0.53 = 2.67 m3
1 m3 OPC (Ordinary Portland Cement) = 1440 kg
Weight of 1 bag of cement = 50 kg
Volume of 1 bag of cement = 50 / 1440 = 0.0347 m3
For 10 m3 of brickwork, no. of cement bags needed = 0.53 / 0.0347 = 15.27
approx 15 bags

For 1: 4 cement mortar,
Volume of cement = 3.2 / 5 = 0.64 m3
Volume of sand = 3.2 – 0.64 = 2.56 m3
1 m3 OPC (Ordinary Portland Cement) = 1440 kg
Weight of 1 bag of cement = 50 kg
Volume of 1 bag of cement = 50 / 1440 = 0.0347 m3
For 10 m3 of brickwork, no. of cement bags needed = 0.64 / 0.0347 = 18.44
approx 18 bags

For 1: 3 cement mortar,
Volume of cement = 3.2 / 4 = 0.8 m3
Volume of sand = 3.2 – 0.8 = 2.4 m3
1 m3 OPC (Ordinary Portland Cement) = 1440 kg
Weight of 1 bag of cement = 50 kg
Volume of 1 bag of cement = 50 / 1440 = 0.0347 m3
For 10 m3 of brickwork, no. of cement bags needed = 0.8 / 0.0347 = 23.05
approx 22.5 bags

For 1: 2 cement mortar,
Volume of cement = 3.2 / 3 = 1.07 m3
Volume of sand = 3.2 – 1.07= 2.13 m3
1 m3 OPC (Ordinary Portland Cement) = 1440 kg
Weight of 1 bag of cement = 50 kg
Volume of 1 bag of cement = 50 / 1440 = 0.0347 m3
For 10 m3 of brickwork, no. of cement bags needed = 1.07 / 0.0347 = 30.83
approx 30 bags

Ratio Cement Sand
1:2 1 m3 (30 bags) 2 m3
1:3 0.75 m3 (22.5 bags) 2.25 m3
1:4 0.6 m3 (18 bags) 2.4 m3
1:5 0.5 m3 (15 bags) 2.5 m3
1:6 0.45 m3 (13 bags) 2.7 m3

As per standard values,

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