Energy calculator
Motor Energy Cost Calculator
Convert motor horsepower and operating assumptions into annual kWh and electrical cost.
What this calculator does
- Calculate electric motor kWh and cost from horsepower, efficiency, load, runtime, and electric rate.
- Use when estimating energy cost for pumps, fans, conveyors, compressors, and driven equipment.
- Calculate electric motor kWh and cost from horsepower, efficiency, load, runtime, and electric rate.
Formula used
- Input kW = horsepower × 0.746 × load ÷ efficiency
- Annual energy = input kW × annual runtime
- Annual cost = annual energy × electricity rate
Inputs explained
- Motor horsepower: undefined
- Motor efficiency: undefined
- Average load: undefined
- Runtime: undefined
- Electricity rate: undefined
How to use the result
- Use when estimating energy cost for pumps, fans, conveyors, compressors, and driven equipment.
- This is a planning calculator. Validate assumptions against your process data before using the result as a final quote, schedule, or engineering decision.
Common questions
- Which inputs usually drive the motor energy cost result? motor horsepower, motor efficiency, average load, runtime, and electricity rate usually have the biggest effect. When one of those assumptions changes, rerun the calculator and compare the new $ / yr result before updating the plan.
- What does the motor energy cost calculator do? Calculate electric motor kWh and cost from horsepower, efficiency, load, runtime, and electric rate.
- What inputs do I need for the motor energy cost calculator? You need motor horsepower, motor efficiency, average load, runtime, and electricity rate. Use measured values from your line, quote package, supplier data, or current production plan whenever possible.
- How should I interpret the motor energy cost result? Treat the $ / yr output as a planning estimate for energy work. Compare it against process history, quoted assumptions, and operating limits before making final decisions.
Last reviewed 2026-05-12.