Metric by default — litres, kg, °C · No signup

Pool Calculator for the UK

Volume in litres, chemicals in grams, heating in kW. Accurate, fast, and free for UK pool owners.

Pool Volume Calculator (Litres)

Enter metres — get litres + gallons. 1 m³ = 1,000 L.

Same numbers as US ppm — label reads mg/L for trust. Salt 2700–3400 mg/L.

Exact doses in grams & litres for balanced water

Daily chlorine + shock in metric units

Salt in kg for 2700–3400 mg/L systems

Corrosive, balanced or scaling? One number.

Heating time + energy cost in kWh

Fill, heating and maintenance in GBP

Same range as US pools — default 3200 mg/L, 20 kg bags. Never above 4000 mg/L (4 g/L).