Battery Amp-Hour (Ah) to Watt-Hour (Wh) Calculator

Convert battery capacity from Amp-hours (Ah) to Watt-hours (Wh)

Battery Ah to Wh Calculator

For Lead-Acid and Lithium Batteries

Results:

Watt-Hours (Wh): 0.00

Battery Ah to kWh Calculator
Battery Bank Size Calculator

How to Use the Calculator

Ah to Wh Conversion

  1. Enter the battery's Amp-Hour (Ah) capacity.
  2. Input the battery's nominal Voltage (V).
  3. Click "Calculate" to get the Watt-Hours (Wh).

Resetting Values

  1. Click the "Reset" button to clear all input fields.
  2. All result values will return to 0.00.

How to Convert Battery Ah to Watts

Bridge stored charge to available power with these field-tested steps.

1. Gather Inputs

Record the rated amp-hours, discharge time (20h, 10h, etc.), nominal voltage, and wiring scheme.

  • Series wiring increases voltage.
  • Parallel wiring increases Ah.

2. Convert Ah to Amps

Most Ah ratings assume a 20-hour discharge. Divide by hours to estimate continuous amps.

  • Amps = Ah ÷ Hours.
  • Example: 100Ah ÷ 20h = 5A continuous.

3. Apply the Formula

Watts = Amps × Volts for instantaneous power. For energy, use Wh = Ah × V.

  • Watts = (Ah ÷ Hours) × V
  • Wh = Ah × V

4. Real-Life Example

200Ah, 12V lithium battery rated at 1C.

  • Continuous amps at 1C = 200A.
  • Watts = 200A × 12V = 2,400W.
  • Energy = 200Ah × 12V = 2,400Wh.

Battery Ah to Watts Chart

Instant conversions for common voltages using Watts = Ah × V.

12V Systems

Amp-Hours Watts
50 Ah 600 W
75 Ah 900 W
100 Ah 1,200 W
150 Ah 1,800 W
200 Ah 2,400 W

24V Systems

Amp-Hours Watts
50 Ah 1,200 W
75 Ah 1,800 W
100 Ah 2,400 W
150 Ah 3,600 W
200 Ah 4,800 W

48V Systems

Amp-Hours Watts
50 Ah 2,400 W
75 Ah 3,600 W
100 Ah 4,800 W
150 Ah 7,200 W
200 Ah 9,600 W

Multiply the watt value by parallel strings or derate by inverter efficiency to plan real-world output.

Battery Ah to Watts FAQs

Quick answers for the most common conversion questions.

How do you convert battery Ah to watts?

Divide the Ah rating by the discharge hours to get amps, then multiply by the battery voltage (Watts = Amps × Volts). For a rough energy figure, use Wh = Ah × V.

How many watts is 150Ah?

Multiply by system voltage: 150Ah × 12V = 1,800W; at 24V it is 3,600W, and at 48V it is 7,200W.

How many Ah is 1000Wh?

Use Ah = Wh ÷ V. At 12V, 1,000Wh equals about 83.3Ah; at 24V it equals 41.7Ah; at 48V it equals 20.8Ah.

How many watts is 100Ah?

At 12V, 100Ah corresponds to 1,200W. Scaling to 24V gives 2,400W, and 48V yields 4,800W, assuming the battery can deliver full rated current.

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