How to use the battery amp-hours to energy calculator
Convert a battery capacity in amp-hours and its voltage into stored energy in watt-hours. Enter battery capacity, nominal voltage in the fields above; the stored energy are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “battery Wh”, “battery energy from Ah”, “how much energy in my battery”, “calculate battery amp-hours to energy”, “find stored energy”.
Formula
Variables
- Ah — Battery capacity (Ah)
- Vb — Nominal voltage (V)
Worked example
With battery capacity = 2.5 Ah, nominal voltage = 3.7 V, the calculator gives stored energy ≈ 9.25 Wh; stored energy ≈ 33.3 kJ.
Frequently asked questions
What is the battery amp-hours to energy calculator used for?
Convert a battery capacity in amp-hours and its voltage into stored energy in watt-hours. It helps with questions such as “battery Wh”, “battery energy from Ah”, “how much energy in my battery”.
What is the formula for the battery amp-hours to energy calculation?
Stored energy (Wh) = Ah × Vb. Stored energy (kJ) = [Stored energy] × 3.6. Here Ah is battery capacity (Ah), Vb is nominal voltage (V).
What inputs do I need for the battery amp-hours to energy calculator?
You need battery capacity in Ah, nominal voltage in V. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the battery amp-hours to energy calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the battery amp-hours to energy result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.