Mortar Calculator
Calculate cement-sand mortar: proportions, cement and sand consumption by volume and grade. M100, M150, M200, M300.
How many cubic meters of mortar you need to mix
Grade defines the cement-to-sand proportions
Calculation formula
Consumption = Volume × Rate per 1 m³
Cement, sand, and water consumption is taken from per-1-m³ rates for the chosen grade and scaled linearly to the requested mortar volume.
About the mortar calculator
The mortar calculator helps you compute cement, sand, and water consumption for mixing the cement-sand mortar of any volume. Enter the cubic meters and pick a grade — M100, M150, M200, or M300 — and the calculator applies standard rates and scales them linearly to your volume.
It is useful when laying brick or block walls, plastering surfaces, pouring floor screeds, or making light foundations. You will know in advance how many cement bags to buy and how much sand to deliver, so the work does not stop halfway.
All calculations run locally in your browser — no server, no signup. Use it free and without ads.
Benefits of the calculator
Instant calculation
Cement, sand, and water consumption recompute automatically when you change volume or grade.
Four common grades
Ready-made rates for M100, M150, M200, and M300 — no need to look up consumption tables.
Cement bags count
Beyond kilograms, we also show the number of 50 kg bags — handy for ordering and delivery.
Frequently asked questions
Which cement-to-sand ratio should I use — 1:3 or 1:4?
A 1:3 ratio (one part cement to three parts sand) yields M150–M200 mortar and suits screeds and load-bearing masonry. A 1:4 ratio gives a weaker M100 — used for partition walls and plastering. M300 needs roughly 1:2.5, while M100 needs about 1:5.
How much water should I add as a percentage?
Water is roughly 50–60% of the cement weight, giving a water-cement ratio of 0.5–0.6. About 180–210 liters of water go into 1 m³ of mortar depending on the grade and sand moisture. Adjust by feel — the mix should slide off the trowel without running.
What is the difference between M150 and M200 mortar?
M200 is roughly 30% stronger than M150 and handles higher loads, so it is used for garage screeds, foundations, and load-bearing brickwork. M150 is the all-purpose grade for ordinary brick masonry and plastering, with lower cement consumption — 300 kg against 360 kg per cubic meter.
Do I need a plasticizer in cement-sand mortar?
A plasticizer is not mandatory but helpful: it improves workability, lowers water demand, and increases frost resistance of the cured mortar. It is most often added to winter mixes and to underfloor-heating screeds. For ordinary summer brickwork you can skip it or replace it with a small amount of liquid soap.
Should I order mortar with a reserve?
Yes, add 5–10% on top of the calculated volume — for mixing losses, leftovers in the container, and surface irregularities. The reserve matters especially in masonry and plastering, where joint or coat thickness varies.