Concrete mix calculator

Allocate a specified dry-material volume among cement, fine aggregate and coarse aggregate by your chosen volume ratio.

On your device · No account

Privacy details

Concrete mix calculator processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

Copy link includes the inputs you choose to share in the address. Anyone with that link can reopen them. Files and generated results are excluded. Password and key tools share settings only.

Cement parts

Fine aggregate parts

More inputs and assumptions

Coarse aggregate parts

Dry material volume to allocate

Answer

…

Allocate a specified dry-material volume among cement, fine aggregate and coarse aggregate by your chosen volume ratio.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Saved scenario

Save the current answer, then change an input to compare. This clears when you leave.

Formula and assumptions

This is ratio arithmetic only. Dry ingredient volumes do not sum to finished concrete yield; water content, moisture, compaction and strength are not inferred. No structural mix design or recommended ratio is supplied.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

Scratch calculator

Check another calculation

Use +, −, ×, ÷, parentheses and %. A percentage is divided by 100. This does not change the main tool.

Reset reloads the tool with its starting values and releases open files and device controls. Saved drafts stay on this device until you delete them.

Links include your inputs and settings. Anyone with the link can see them, so leave out private text. Files and generated results are left out; random draws run again.

Keyboard shortcuts

Updated 2026-09-26

Using Concrete mix calculator

Allocate a specified dry-material volume among cement, fine aggregate and coarse aggregate by your chosen volume ratio.

Next: Ratio calculator

A worked example

Example inputs: cement parts = 1, fine aggregate parts = 2, coarse aggregate parts = 3, dry material volume to allocate = 0.12. Cement volume fraction = 0.166666666667.

Before you use the result

Example results for cement parts

These examples use Fine aggregate parts: 2; Coarse aggregate parts: 3; Dry material volume to allocate: 0.12. They are reference calculations, not recommended settings.

Cement parts	Cement volume fraction
0.5	0.0909090909091
1	0.166666666667
2	0.285714285714

Cite this page

Citation style

ToolOctopus. “Concrete mix calculator.” Updated 2026-09-26. https://tooloctopus.com/concrete-mix-calculator.

Add an access date if your instructions require one.

Citation formatting uses citeproc-js by Frank Bennett and Citation Style Language styles. Licence and source code.