Pool Size and Equipment

These calculators start from the pool’s size. Get its volume in gallons and litres, then the pump flow, filter size and heater size, or estimate how much water and heat are lost by evaporation.

Tools in this group

• Pool Evaporation Calculator — Enter the pool size, water and air temperatures, humidity and air speed to estimate the water and heat lost to evaporation.
• Pool Filter Size Calculator — Enter your flow, or pool volume and turnover time, to get the minimum sand, DE or cartridge filter area and the sand tank diameter.
• Pool Heater Calculator — Enter the pool volume, start and target temperature and heat-up time to get the heater size in BTU/h and kW, the time and the cost.
• Pool Pump Size Calculator — Enter the pool volume and turnover time to get the pump flow you need, the daily run time for your pump and a pipe-size check.
• Pool Volume Calculator — Choose the pool shape and enter its size and depth to get the gallons and litres of water, the pump flow for a turnover time and how long it takes to fill.