kWh to Amps Calculator
Given how much energy was used (kWh) and over what time, this calculator finds the average current drawn in amps.
Quick answerYou cannot convert kWh directly to amps without knowing the time and voltage. For example, 10 kWh used over 5 hours at 230 V is 8.70 A on average at a power factor of 1.
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Average power (W) = kWh × 1000 ÷ hours. Average current (A) = power ÷ (volts × power factor). This is the average over the period, not the peak.
kWh to average amps conversion chart
These examples assume DC or single-phase AC at power factor 1. They show average current over the full period, not startup or peak current.
| Energy used | Time period | At 120 V | At 230 V |
|---|---|---|---|
| 1 kWh | 1 hour | 8.33 A | 4.35 A |
| 1 kWh | 8 hours | 1.04 A | 0.54 A |
| 5 kWh | 5 hours | 8.33 A | 4.35 A |
| 10 kWh | 5 hours | 16.67 A | 8.70 A |
| 10 kWh | 24 hours | 3.47 A | 1.81 A |
| 30 kWh | 24 hours | 10.42 A | 5.43 A |
For a power factor below 1, divide the listed current by the power factor. This table does not cover three-phase systems or unbalanced loads.
Worked example: 10 kWh over 5 hours
Ten kWh used over 5 hours equals an average of 2,000 W. At 230 V and a power factor of 1, the average current is 2,000 ÷ 230 = 8.70 A. At 120 V, the same average power is 16.67 A.
If the load has a 0.8 power factor, the 230 V result rises to 10.87 A because more current is required for the same real power.
Average current is not breaker-sizing current
This conversion spreads energy across the selected time, so it cannot show startup surges or the highest current at any moment. Motors, compressors and power supplies can briefly draw much more than their period average.
Do not size wiring, breakers or inverters from this result alone. Use equipment nameplate ratings and local electrical-code requirements, or have a qualified electrician measure the circuit. A clamp meter can show real current when used safely.
Sources used for assumptions: U.S. Energy Information Administration — measuring watts and kilowatt-hours; NIST — SI units of electric current and the relationship 1 V = 1 W/A; Schneider Electric — single-phase and balanced three-phase power calculations.
Frequently asked questions
Why do I need the time?
kWh is total energy, not current. To get amps you must spread that energy over a time to find the average power, then divide by voltage.
What voltage should I use?
Your local mains voltage — about 120 V in North America, 230 V in Europe and the UK.
Is this peak or average current?
Average. Real draw rises and falls; this gives the steady-average figure over the chosen time.
How many amps is 1 kWh?
There is no single answer without time and voltage. Over 1 hour, 1 kWh averages 8.33 A at 120 V or 4.35 A at 230 V, assuming power factor 1.
Can I use this result for a three-phase circuit?
No. This calculator uses the DC or single-phase relationship. Balanced three-phase current also depends on the line-to-line voltage and a √3 factor; use equipment data or a qualified electrician for circuit sizing.
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