Concrete Yield Calculator
Convert batch weights and density into actual yield and per-m³ contents.
Quick answer
With the default inputs: Cement 3600 · Sand 7000 · Gravel 11500 etc.Actual yield 9.96 m³
Edit the inputs below to recalculate.Inputs
Result
Actual yield
9.96m³
| Total batch weight | 23900kg |
| Cement per m³ | 362kg/m³ |
| Sand per m³ | 703kg/m³ |
| Gravel per m³ | 1155kg/m³ |
| Water per m³ | 181kg/m³ |
| Sand ratio | 37.8% |
| Water-cement ratio | 0.500 |
| Binder per m³ | 362kg/m³ |
Density must be measured (bucket method) because it varies widely with aggregate. If per-m³ contents differ from the batch ticket by more than 2%, check the weighing equipment.
Reverse: known result, work out one input
Enter a target result; the other inputs stay fixed and this one is worked out.
Formula
| Batch weight | M = cement + sand + gravel + water |
| Yield | V = M ÷ density |
| Per m³ | mi = weight ÷ V |
| Sand ratio | βs = sand ÷ (sand + gravel) × 100% |
3600 + 7000 + 11500 + 1800 = 23900 kg at 2400 kg/m³ yields 9.96 m³, giving 361 kg cement, 703 kg sand, 1155 kg gravel and 181 kg water per m³ at a 37.8% sand ratio.
How to work it out
- Add the batch weights: cement + sand + stone + water + supplementary cementitious materials + liquid admixture. SCMs and admixture are the items most often omitted.
- Divide by the measured bulk density, not the nominal 2,400 — measure it, and expect 2,350-2,450.
- Compare the resulting yield with the plant's stated volume; a deviation over 2% means the mix was not batched as designed.
- Work out the per-cubic-metre consumption of each material (item weight ÷ actual yield) and compare with the design mix.
- Sand ratio = sand ÷ (sand + stone) × 100%; a large deviation directly affects workability.
Where it goes wrong
- Dividing by a nominal 2,400 — 2,360 versus 2,440 is 3%, which is 30 kg of binder per cubic metre.
- Omitting SCMs and admixture — 60 kg of fly ash plus 2% admixture is 3% of the batch weight, and leaving it out inflates the yield.
- Checking only total yield, not per-metre consumption — the volume balances while cement is 20 kg/m³ short, and strength fails anyway.
Material and cost
Shortfall is a silent loss: 0.3 m³ missing from a 9 m³ truck is about 150 at C30, and 3% on a 5,000 m³ project is 70,000-80,000 — roughly a project team's margin.
On site
- Audit truck volumes periodically with a calibrated gauge; do not take the driver's word.
- Bulk density shifts with each material batch — retest when the source changes instead of reusing one figure all year.
- Keep the batching records (plants archive them electronically); they are the only evidence in a later claim.
Basis
- GB/T 14902-2012 Ready-mixed concrete, Chapter 8 (supply quantity and delivery testing)
- GB 50164-2011 Standard for quality control of concrete
- JGJ 55-2011 Specification for mix proportion design of ordinary concrete
FAQ
What is shortfall and how is it detected?
Shortfall means the delivered volume is less than what is invoiced. This calculator is the test: yield should equal batch weight divided by density. A batch that yields 9 m³ but is billed as 10 is 10% short. Cross-check with drum volume, weighbridge conversion and density measurement.
Why measure density instead of assuming it?
The same mix with limestone versus granite aggregate can differ by over 100 kg/m³, and lightweight concrete sits near 1800. Assuming 2400 overstates yield by 25% for lightweight aggregate and understates it for heavy aggregate. One bucket measurement beats any textbook figure.
What if the water-cement ratio comes out high?
Check aggregate moisture first. Sand at 5% moisture holds 350 kg of water in a 7000 kg batch; if that is not deducted from the added water, the true ratio runs more than 0.10 above the ticket and the strength drops a grade. This is the commonest cause of low strength on site, far more common than bad cement.
Cite this page
Use this format in reports, method statements or coursework. The link is permanent.
Building Calculator. Concrete Yield Calculator. 2026-10-25. https://jianzhujisuan.com/en/concrete-yield
Results are estimating aids only and are not a design basis. Construction and final accounts must follow the drawings, the applicable standards and an approved method statement. Anything affecting structural safety, shoring or falsework must be checked by a suitably qualified engineer.