How the Water-Cement Ratio works
Water = Cement weight × w/c ratio.
How to use this calculator
- Sign up free and verify your email to unlock the calculator.
- Choose Metric (m, mm, m³, kg) or Imperial (ft, in, cft, lb) units.
- Enter the cement bags, w/c ratio.
- Results update instantly — read the quantities in the Results panel.
- Add a wastage allowance and confirm against your drawings and specifications before ordering.
Typical uses
Checking mixing water for target strength and workability.
Assumptions & limitations
Results are planning estimates based on standard assumptions for concrete & masonry work. They do not replace structural design, site measurement or project specifications. Material densities, wastage and mix proportions vary by region and supplier.
Frequently asked questions
- How does the Water-Cement Ratio work?
- Water = Cement weight × w/c ratio.
- Can I use the Water-Cement Ratio in feet and inches?
- Yes. Switch to Imperial and enter feet, inches, square feet or pounds — the calculator converts automatically and shows results in imperial units.
- When should I use the Water-Cement Ratio?
- Checking mixing water for target strength and workability.
- Is this construction calculator free?
- Yes. All CM PRO construction calculators are free — you only need to sign up and verify your email.
Related searches: water cement ratio calculator, w/c ratio, water for concrete mix.
