Concrete Calculator
Calculate concrete volume in cubic meters for strip foundation, slab, or column. Mix proportions: cement, sand, gravel, and water for M200, M300, M400 grades.
Structure length in meters
Structure width in meters
Structure height or thickness in meters
Grade defines the cement, sand and gravel proportions
Calculation formula
V = Length × Width × Height
Concrete volume equals the product of the three structure dimensions. Mix composition is taken from material consumption norms for the selected grade per 1 m³.
About the Concrete Calculator
The concrete calculator helps you compute the cubage and mix composition based on structure dimensions. You enter length, width and height, choose a grade — M200, M300 or M400 — and instantly get the volume in cubic meters plus the consumption of cement, sand, gravel and water.
Use this tool when planning a strip foundation, monolithic slab, column, or apron walkway. You will know in advance how many cubes of ready-mix to order from a concrete truck or how many bags of cement to buy if you mix concrete on-site.
All calculations run locally in your browser: data is never sent to a server, no registration is required. Use the calculator for free, with no limits and no ads.
Calculator benefits
Instant calculation
Volume and mix composition update automatically whenever you change a dimension or grade.
Composition by grade
Built-in proportions for M200, M300 and M400 — no need to look up material consumption tables.
Cement bag count
Besides kilograms, we show the number of 50-kg bags — handy for ordering and delivery planning.
Frequently asked questions
How do I calculate concrete cubage for a foundation?
Multiply length, width and height of the structure in meters to get the volume in m³. For a strip foundation use the total strip length as 'length'; for a slab use length and width of the slab; for a column use cross-section area and height.
Which concrete grade should I choose?
M200 suits light structures, walkways and screeds. M300 is the most universal option for private-house foundations and floor slabs. M400 is needed for heavy loads and monolithic structures.
What are the cement, sand and gravel proportions?
Per 1 m³ of M300 concrete you need roughly 350 kg of cement, 800 kg of sand, 1200 kg of gravel and 175 L of water. M200 needs less cement, M400 needs more; the calculator substitutes the right values automatically.
How many cement bags per cubic meter of concrete?
For M300 you need about 7 bags of cement per 1 m³ (350 kg ÷ 50). For M200 about 6 bags is enough, and for M400 you need around 8–9 bags.
Should I order extra concrete as a reserve?
Yes — when pouring a foundation or slab it is wise to order 5–10% more than the calculated volume to cover losses, ground unevenness, and mix consolidation during vibration.
How accurate is the result?
The calculator uses average per-cubic-meter consumption norms for each grade. Actual proportions may vary by 5–10% depending on cement quality, sand moisture, and gravel fraction.