⚡ Energy Cost

Motor Running Cost Calculator

Calculate electricity cost of running an industrial motor per hour, day and month.

Enter motor nameplate kW rating
1 HP = 0.746 kW
Typical: 75–85% for industrial motors
Typical IE2: 88–92%
Industrial tariff in India: typically ₹6–12 per kWh
📊 Running Cost Breakdown
Actual Power Draw
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Cost per Hour
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Cost per Day
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Cost per Month
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Monthly Energy Consumption
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Formula Used:
Actual Power (kW) = Rated kW × Load Factor % × (1 / Efficiency %)
Cost = Actual Power × Hours × Tariff
💡 Cost Saving Tip: Replacing a standard IE1 motor with an IE3 (premium efficiency) motor can reduce running cost by 5–8%. At this consumption level that means saving —/month.

How This Calculator Works

This calculator estimates the electricity cost of running an industrial motor based on its rated power, actual load, motor efficiency and your electricity tariff.

Load Factor accounts for the fact that most motors don't run at full rated power — a 7.5 kW motor driving a pump at 80% load actually draws about 6 kW.

Motor Efficiency accounts for electrical losses inside the motor. An IE2 motor at 90% efficiency draws slightly more power than its mechanical output.

Common Motor Sizes (India)

HPkWTypical Use
5 HP3.7 kWSmall pumps, fans
10 HP7.5 kWCompressors, conveyors
20 HP15 kWLarge pumps, machinery
50 HP37 kWHeavy industrial drives

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Motor Running Cost Formula

The electricity cost of running a motor depends on three things: how much power it actually draws, how many hours it runs, and your electricity tariff.

Actual Power (kW) = Rated kW × (Load Factor / 100) × (100 / Efficiency)
Energy (kWh) = Actual Power × Hours
Cost (₹) = Energy × Tariff per kWh

Why Load Factor Matters

A motor rated at 10 kW running at 75% load only draws 7.5 kW of mechanical power. But accounting for motor efficiency (say 90%), the actual electrical consumption is 7.5 / 0.90 = 8.33 kW. Over 8 hours at ₹8/kWh that's ₹533/day — not ₹640 (what you'd calculate using nameplate kW alone). The difference adds up to thousands per month across a factory floor.

How to Reduce Motor Running Cost

  • Upgrade to IE3 or IE4 premium efficiency motors — payback is typically 1–3 years
  • Install Variable Frequency Drives (VFDs) on variable-load applications — saves 20–50%
  • Ensure motors are correctly sized — an oversized motor running at 40% load is very inefficient
  • Schedule motor operation during off-peak tariff hours where time-of-day pricing exists
  • Regular bearing and winding maintenance prevents efficiency loss over time