Wh to mAh Calculator
Convert watt-hours (Wh) to milliamp-hours (mAh): mAh = Wh ÷ V × 1,000. Turn laptop, drone and power bank Wh ratings into mAh at the cell voltage.
CAPACITY
13,514 mAh
IN Ah
13.51 Ah
FORMULA
mAh = (Wh/V) × 1000
Wh to mAh — Battery Table (3.7V Li-ion)
| Wh | mAh (3.7V) | mAh (3.85V) | mAh (7.4V) |
|---|---|---|---|
| 5 Wh | 1,351 | 1,299 | 676 |
| 10 Wh | 2,703 | 2,597 | 1,351 |
| 15 Wh | 4,054 | 3,896 | 2,027 |
| 20 Wh | 5,405 | 5,195 | 2,703 |
| 30 Wh | 8,108 | 7,792 | 4,054 |
| 40 Wh | 10,811 | 10,390 | 5,405 |
| 50 Wh | 13,514 | 12,987 | 6,757 |
| 75 Wh | 20,270 | 19,481 | 10,135 |
| 100 Wh | 27,027 | 25,974 | 13,514 |
💡 How to Convert Wh to mAh
To convert Wh to mAh, divide the watt-hours by the voltage and multiply by 1,000. Use the battery's nominal voltage: 3.7 V for a single lithium-ion cell, 7.4 V for two cells in series, 11.1 V for three, and so on.
Wh to mAh formula
Example: 50 Wh at 3.7 V → 50 ÷ 3.7 × 1,000 = 13,514 mAh
Worked examples
- 99 Wh laptop battery, 3-cell pack (11.1 V): 99 ÷ 11.1 × 1,000 = 8,919 mAh.
- The same 99 Wh expressed at single-cell 3.7 V: 99 ÷ 3.7 × 1,000 = 26,757 mAh, the way power banks are usually labelled.
- Drone battery, 2-cell 7.4 V, 37 Wh: 37 ÷ 7.4 × 1,000 = 5,000 mAh.
Wh to mAh table
| Wh | 3.2 V | 3.6 V | 3.7 V | 3.85 V | 7.4 V (2S) | 11.1 V (3S) |
|---|---|---|---|---|---|---|
| 5 | 1,562 | 1,389 | 1,351 | 1,299 | 676 | 450 |
| 10 | 3,125 | 2,778 | 2,703 | 2,597 | 1,351 | 901 |
| 18.5 | 5,781 | 5,139 | 5,000 | 4,805 | 2,500 | 1,667 |
| 37 | 11,562 | 10,278 | 10,000 | 9,610 | 5,000 | 3,333 |
| 50 | 15,625 | 13,889 | 13,514 | 12,987 | 6,757 | 4,505 |
| 74 | 23,125 | 20,556 | 20,000 | 19,221 | 10,000 | 6,667 |
| 99 | 30,938 | 27,500 | 26,757 | 25,714 | 13,378 | 8,919 |
| 100 | 31,250 | 27,778 | 27,027 | 25,974 | 13,514 | 9,009 |
| 160 | 50,000 | 44,444 | 43,243 | 41,558 | 21,622 | 14,414 |
Why the same battery can show two mAh figures
A multi-cell pack can be described at its pack voltage (for example 11.1 V) or at single-cell voltage (3.7 V). The stored energy in Wh is identical; only the mAh figure changes. Power bank makers usually quote mAh at 3.7 V, which makes the number look larger, so compare products in Wh.
Cells in series and parallel
Battery packs are often described with codes like 3S2P: three cells in series (3 × 3.7 V = 11.1 V) and two in parallel (double the mAh of one cell). Series adds voltage, parallel adds capacity, and the pack's Wh is the sum of all its cells.