Pool pump savings calculator

StateFills in your average priceElectricity price (¢/kWh)From your bill, or your state average Single-speed pump draw (W)About 1,800 W for a typical 1.5 hp pump Hours per day now Variable-speed setting (% of full speed)It runs longer at low speed to move the same water Days per year the pool runs

—saved per year

Now: —
Variable speed: —
Hours per day at low speed: —

Pump physics: power falls with the cube of speed, so moving the same water at half speed takes about a quarter of the energy. We add 15% for motor losses at low speed.

The pump’s label lists amps and volts; multiply them for watts (a 1.5 hp pump at 230 V and about 8 A draws roughly 1,800 W). Real pumps don’t follow the cube law perfectly, especially through clogged filters and narrow plumbing, so expect real savings somewhat below this estimate.