How to calculate cement sand quantity for plastering

Mostly we get a trouble for calculating the accuracy of required materials for construction work because if we bought excess or shortage of material then unnecessarily we have to spend money.

Already we discussed concrete material calculation so in this post, we are going to discuss how to calculate cement and sand for plastering work with example calculation.

Plastering calculation, cement plastering thickness

How to calculate cement and sand quantity for plastering

We are going to estimate the required material quantity for Area – 10m2

Thickness of Mortar – 15mm (0.015m) and the Mortar Ratio – 1:3

Required volume of Mortar = 10 x 0.015 = 0.15 m3

We find out the volume of mortar in wet condition mortar volume 0.15 m(After the consolidation of Cement+sand+water). So in dry conditions, we have to take 30 to 35% sand bulkage and add 20% for wastage.

So the dry volume  = 0.15+(0.15 x 35%) + (0.15 x 20%) = 0.2325 m3

To estimate 1m3 of mortar volume  (Avg it will be 1.5 to 1.6) Normally it was taken as 1.54 as constant.

Mix ratio 1:3 – 1 part of cement and 3 part of sand (Quantityof sand is taken 3 times of Cement quantity)

So total part of mortar = 1+3 = 4

Cement = (0.2325 x 1)/4 = 0.058 cum  To convert into cement bags  – (0.058 x 1440)/50 = 1.67 Bags

Unit weigh of Cement – 1440 Kg/m3    1 bag cement – 50 Kg

Now, Sand = (0.2325 x 3)/4 = 0.174 m3


So the required quantity of material for 10 sqm, mortar thickness 15mm & mix ratio 1:3

Cement – 1.67 bags        Sand – 0.174 m3

Common plastering mortar thickness and mix ratio listed below.

External Wall20mm1:6
Internal Wall15mm1:4

Plastering Material Calculator

You may use the below plastering calculator for material estimation. If you like this share with your friends.

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