Amp-Hours (Ah) to Watt-Hours (Wh) Conversion Calculator
Convert amp-hours to watt-hours by entering the amount of charge in Ah and the battery terminal voltage below.
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How to Convert Amp-Hours to Watt-Hours
Amp-hours (Ah) and watt-hours (Wh) are units that are often used to measure battery capacity.
The ampere-hour capacity of a battery, expressed as Ah or A·h, describes the duration for which a battery can supply one ampere of current and the maximum amount of current it can supply for one hour.
The watt-hour capacity of a battery, expressed as Wh or W·h, is a measure of the amount of energy being supplied to the load.
To convert amp-hours to watt-hours, you can use the Ohm’s Law formula.
Ah to Wh Conversion Formula
To convert from electric charge to energy using Ohm’s Law, use the following formula:
E(Wh) = Q(Ah) × V(V)
Thus, the energy E in watt-hours is equal to the charge Q in amp-hours times the voltage V. This is essentially the same formula used to convert amps to watts.
By reversing this formula, you can also convert Wh to Ah.
For example, let’s convert 300 Ah charge at 12 V to Wh.
E(Wh) = 300 Ah × 12 V
E(Wh) = 3,600 Wh
So, a 300 amp-hour charge at 12 volts is equal to 3,600 watt-hours (3.6 kWh) of energy.
Amp-Hours to Watt-Hours Conversion Chart
| Amp-Hours | Watt-Hours at 12V | Watt-Hours at 24V |
|---|---|---|
| 50 Ah | 600 Wh | 1,200 Wh |
| 100 Ah | 1,200 Wh | 2,400 Wh |
| 150 Ah | 1,800 Wh | 3,600 Wh |
| 200 Ah | 2,400 Wh | 4,800 Wh |
| 250 Ah | 3,000 Wh | 6,000 Wh |
| 300 Ah | 3,600 Wh | 7,200 Wh |
| 350 Ah | 4,200 Wh | 8,400 Wh |
| 400 Ah | 4,800 Wh | 9,600 Wh |
| 450 Ah | 5,400 Wh | 10,800 Wh |
| 500 Ah | 6,000 Wh | 12,000 Wh |
| 550 Ah | 6,600 Wh | 13,200 Wh |
| 600 Ah | 7,200 Wh | 14,400 Wh |
| 650 Ah | 7,800 Wh | 15,600 Wh |
| 700 Ah | 8,400 Wh | 16,800 Wh |
| 750 Ah | 9,000 Wh | 18,000 Wh |
| 800 Ah | 9,600 Wh | 19,200 Wh |
| 850 Ah | 10,200 Wh | 20,400 Wh |
| 900 Ah | 10,800 Wh | 21,600 Wh |
| 950 Ah | 11,400 Wh | 22,800 Wh |
| 1000 Ah | 12,000 Wh | 24,000 Wh |
You might also be interested in converting amp-hours to kilowatt-hours.