Calculator inputs
Enter your mix details, dosage basis, wastage, and packaging assumptions.
Usage trend graph
This graph scales admixture demand against batch volume using your current dosage assumptions.
Example data table
These example rows show how dosage demand changes with binder content, basis, and batch size.
| Scenario | Volume (m³) | Cement (kg/m³) | SCM (kg/m³) | Sample dosage | Density (kg/L) | Wastage (%) | Estimated result (L) |
|---|---|---|---|---|---|---|---|
| Starter Slab | 5.00 | 320 | 30 | 0.70% of binder | 1.07 | 3 | 11.79 |
| Parking Bay | 12.00 | 350 | 50 | 0.80% of binder | 1.08 | 5 | 37.33 |
| Pump Mix | 18.00 | 380 | 40 | 650 mL / 100 kg | 1.09 | 4 | 51.11 |
| Deck Pour | 25.00 | 400 | 60 | 0.90 L / 100 kg | 1.10 | 5 | 108.68 |
Formula used
Total binder per cubic meter equals cement content plus SCM content.
Total binder for the batch multiplies binder per cubic meter by concrete volume.
When dosage is entered as a percentage by weight of binder:
When dosage is entered by binder reference units:
After that, add wastage and estimate containers.
How to use this calculator
- Enter the total concrete volume for the pour.
- Add cement content and any SCM content in kilograms per cubic meter.
- Choose the dosage basis that matches your admixture data sheet or mix design note.
- Enter the dosage value and product density.
- Add wastage, container size, and price to estimate purchasing needs.
- Press Calculate dosage to display results above the form.
- Review the graph to see how demand scales with batch volume.
- Use the export buttons to save the current result as CSV or PDF.
Frequently asked questions
1. What is admixture dosage rate?
It is the quantity of chemical admixture added relative to the concrete batch or total cementitious material. It is usually expressed as a percentage, milliliters per 100 kilograms, liters per 100 kilograms, or similar manufacturer units.
2. Why include SCM content in the calculation?
Many admixture recommendations are based on total cementitious material, not cement alone. Including fly ash, slag, silica fume, or other SCMs helps you size the actual dosage more accurately for the mix you plan to place.
3. When should I use percentage by weight?
Use percentage by weight when the product data sheet states dosage as a percent of cementitious content. The calculator converts that mass-based dosage into liters by using the product density you provide.
4. Why does density matter?
Density converts admixture mass into volume. Two products with equal percentage dosage can require different liquid volumes if their densities differ. That matters when ordering drums, pails, or totes for site delivery.
5. Should I add a wastage allowance?
Yes. Small losses happen during handling, pumping, transfer, and line priming. A modest wastage factor helps field supply match site reality, especially on larger pours or when packaging sizes do not divide neatly into the required volume.
6. Does the calculator replace supplier recommendations?
No. This tool estimates quantity from the values you enter. Always check the current technical data sheet, trial mix results, project specification limits, and supplier guidance before final batching or procurement decisions.
7. Can I use this for multiple admixtures?
Yes, but calculate each product separately. Different admixtures can have different dosage bases, densities, compatibility limits, and performance windows. Separate calculations keep quantities and packaging estimates easier to verify.
8. What if my dosage is given in another unit?
Convert the supplier unit into one of the supported bases before using the calculator. Once converted, this tool can estimate total liters, weight, packaging count, and the effect of wastage on the final order quantity.