Free Tools
Concrete Mix Calculator (Cement, Sand, Gravel)
Calculate concrete volume and cement, sand, and gravel needs from dimensions and mix ratio. Free, with adjustable grade & composition.
Advanced — composition per m³▾
Typical values per grade; adjust for a different mix design.
Prices (optional)
Important — this is an estimate
Estimate based on standard coefficients; real needs depend on specification, work method, and field conditions. For an accurate BoQ, consult Luxury Art.
Coefficients reference SNI AHSP (typical values, adjustable).
Concrete requirement
For a manual mix; results differ from ready-mix. Excludes water & rebar.
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How to calculate concrete needs
Start from concrete volume
All material needs derive from concrete volume (m³). You can enter volume directly, or compute it from dimensions: slab/road (L × W × thickness) or column/beam (section × length).
Mix ratio drives composition
A manual 1:2:3 mix (cement:sand:gravel) is the most common for non-heavy structures. Higher grades (K-225, K-250) use more cement. Choose the grade suited to your work.
Excludes rebar & formwork
This calculator covers concrete mix material only. Rebar is calculated in the rebar calculator, and formwork plus labor are handled separately in the BoQ.
FAQ
Frequently asked questions
How much cement, sand, gravel for 1 m³ of concrete?
For a manual 1:2:3 mix, one m³ of concrete needs roughly 336 kg cement (about 7-8 bags @40 kg), 0.54 m³ sand, and 0.81 m³ gravel. These are typical SNI defaults you can adjust for a different mix design.
How do I calculate concrete volume for a floor slab?
Slab volume = length × width × thickness. Example: a 5 m × 3 m slab at 12 cm (0.12 m) thick = 1.8 m³. Pick 'Slab / road' mode, enter the three figures, and the calculator computes material needs instantly.
What do grades like K-225 or K-250 mean?
The number after K indicates compressive strength (kg/cm²). Higher means stronger and usually more cement. Important structures like columns and beams generally use a higher grade than a working floor.
Does this apply to ready-mix concrete?
Not entirely. This calculator is for on-site manual mixing. Ready-mix is ordered per m³ from a batching plant with factory-controlled composition — you just calculate the volume, then order that amount.
Why add a little extra?
There's shrinkage during mixing and spillage during pouring, so many builders order slightly more than the theoretical volume. For important structural work, ask the Luxury Art team for a proper BoQ and mix design.
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Luxury Art — Architecture, Interior & Construction
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The calculator here gives you a starting number. Building or renovating with a genuinely polished result takes the right team — that's where Luxury Art works. We handle architecture design, interior design, professional cost planning (RAB), and design-build and construction management.
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