Energy • Runtime • Cost
Estimate what your water pump costs to run.
Enter motor output power and efficiency to estimate electrical input, energy use and running cost.
Step 1
Enter pump usage
Step 2
Your estimate
Enter your pump power, runtime and electricity rate.
Fixed charges and taxes are not included.- Input power used
- —
- Energy per run
- —
- Cost per run
- —
- Estimated annual cost
- —
Uses one energy rate and a constant runtime schedule. Actual consumption changes with load and system conditions.
Which power value should I use?
Use the motor's rated shaft output in hp, kW or W and its efficiency from the nameplate or manufacturer data. The calculator divides output power by efficiency to estimate electrical input power.
Formula and assumptions
Energy per run = input kW × run hours. Monthly energy = energy per run × runs/day × operating days. Cost = kWh × your energy rate. Annual values assume the monthly schedule repeats for 12 months.
What this estimate excludes
- Fixed charges, demand charges, slab changes, taxes, penalties and subsidies.
- Power variation with voltage, loading, pump head, flow, wear and controls.
- Different runtime or tariff across seasons.
Safety and sources
Do not open or probe a live electrical panel unless you are qualified and using appropriate equipment. BEE explains the relationship between motor input power, efficiency and pump shaft power; direct measurement remains more accurate than this estimate.
Bureau of Energy Efficiency: Water-pump performance assessmentNIST: hp and SI conversion factors