What does a 1:50 dilution mean?

A 1:50 dilution means 1 part chemical to 50 parts water. So for every 1ml of chemical, you add 50ml of water. In a 5-litre bucket at 1:50, you need approximately 98ml of chemical and 4,902ml of water.

Does it matter if I get the dilution slightly wrong?

Yes. Too dilute and the product will not clean effectively. Too concentrated wastes product, may damage surfaces, and can be a health and safety risk. Some concentrated chemicals are corrosive or irritant at higher concentrations. Always follow manufacturer guidance.

Should I add chemical to water or water to chemical?

Always add chemical to water, never the other way around. This ensures proper mixing and reduces the risk of splashback of concentrated chemical. Fill the container with the required water first, then add the chemical.

What is COSHH and why does it matter?

COSHH (Control of Substances Hazardous to Health) is UK legislation requiring employers to control exposure to hazardous substances including cleaning chemicals. Correct dilution is a key COSHH requirement. Always check the safety data sheet (SDS) for each product.

CleanCalcs

Chemical Dilution Calculator

Work out the correct water-to-chemical ratio for any dilution rate.

Total Volume Needed

Total solution you need to make

Dilution Ratio

How We Calculate This

For a dilution ratio of 1:N, the total solution is divided into (N+1) parts.

Chemical = total volume ÷ (ratio + 1)

Water = total volume - chemical

For example, 5 litres at 1:50 = 5000ml ÷ 51 = 98ml chemical + 4902ml water.

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Last updated: February 2026

All calculations are estimates. Always verify quantities and timings for your specific situation.