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Amps to kWh Calculator: Convert Electrical Current to Energy Usage

If you know the current in amps (A) and want to find out how much energy your device consumes in kilowatt-hours (kWh), you’ve come to the right place.

This guide explains how to convert amps into kilowatt-hours step-by-step – including formulas, examples, and a free interactive Amps to kWh calculator you can use instantly.

Try it now — just enter current, voltage, and usage time to get your energy consumption and estimated cost.

Amps to kWh Calculator









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🔌 What Does Amps to kWh Mean?

Electric current, measured in amperes (A), tells you how much electricity is flowing.

But energy consumption – what you pay for on your electricity bill – is measured in kilowatt-hours (kWh).

So, to calculate how much energy something uses, you need three things:

  1. Current (A)
  2. Voltage (V)
  3. Time (hours)

⚙️ Formula: Amps to kWh Conversion

The basic formula to convert amps to kilowatt-hours is:

kWh = (Amps × Volts × Hours) / 1000

Where:

  • Amps (A) = current drawn by the device
  • Volts (V) = voltage of the electrical system (120V, 240V, etc.)
  • Hours (h) = how long the device operates
  • Dividing by 1000 converts watts to kilowatts

🧮 Example Calculations

Example 1 — 10A appliance at 120V running for 5 hours:

kWh = (10 × 120 × 5) / 1000 = 6 kWh

So, the device uses 6 kilowatt-hours of energy.

Example 2 — 15A motor at 240V running for 2 hours:

kWh = (15 × 240 × 2) / 1000 = 7.2 kWh

Energy used = 7.2 kWh

💲 How to Calculate Electricity Cost

Once you know energy use (kWh), you can estimate your cost:

Cost = kWh × Electricity Rate

If your rate is $0.15 per kWh, and your appliance used 6 kWh,
then Cost = 6 × 0.15 = $0.90

⚡ Typical Appliance Examples

DeviceCurrent (A)Voltage (V)HoursEnergy (kWh)
Laptop1.512081.44
Refrigerator3120248.64
Air Conditioner10240614.4
Electric Water Heater18240312.96
LED Bulb0.1120100.12

🔋 Why Convert Amps to kWh?

  • Estimate energy costs for home or office appliances.
  • Plan battery capacity for backup or off-grid systems.
  • Design solar setups with accurate load data.
  • Manage industrial equipment energy usage.

🧾 Summary

TermMeaning
Amp (A)Current — flow of electricity
Volt (V)Electrical potential difference
kWhEnergy used over time
Formula(A × V × Hours) / 1000

Example:

(10A × 120V × 5h) / 1000 = 6 kWh

Cost Example:

6 kWh × $0.15 = $0.90