Water to Cement Ratio Calculator
Find the water needed for a concrete or mortar mix from cement weight and a water-cement ratio.
Compare Your Options And Get Clear Answers
Find the water needed for a concrete or mortar mix from cement weight and a water-cement ratio.
Water to Cement Ratio Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Enter Values
Fill in each field with your own numbers.
Calculate
Results update as you change the inputs.
Review
Read the breakdown and the explanation.
Adjust
Change values to compare scenarios.
Water Quick Guide
Typical values for reference.
| Cement kg | W/C | Agg ratio | Water L |
|---|---|---|---|
| 25 | 0.5 | 4 | 12.5 litres |
| 50 | 0.4 | 4 | 20.0 litres |
| 50 | 0.5 | 4 | 25.0 litres |
| 100 | 0.6 | 4 | 60.0 litres |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Water to Cement Calculator FAQ
Answers to common questions about this calculator.
About 0.4 to 0.55 for structural concrete.
The concrete is weaker and more likely to crack.
Water = cement weight x water-cement ratio.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.