How do you convert Ah to Wh?
Multiply amp-hours by the battery's nominal voltage: Wh = V × Ah. A 100 Ah battery at 12.8 V (LiFePO₄) stores 1,280 Wh.
Battery energy
Ah to Wh
Amp-hours only become watt-hours once you know the pack's voltage — so a 100 Ah bank is 1,280 Wh on 12.8 V LiFePO₄ but 4,800 Wh on 48 V. Tap your chemistry or type a voltage below to get real energy, the one thing a plain converter and Google's box can't do.
Formula
Wh = V × Ah (watt-hours = pack voltage × amp-hours)
Ah
=
Energy
320 Wh
V
Tip: use the nominal voltage of one cell for a single cell, or the whole pack voltage for a battery bank.
100 Ah × 3.2 V = 320 Wh
Reference table
Change the voltage in the calculator aboveAmp-hours to Watt-hours at 3.2 V
| Amp-hours (Ah) | Watt-hours (Wh) |
|---|---|
| 1 Ah | 3.2 Wh |
| 2 Ah | 6.4 Wh |
| 5 Ah | 16 Wh |
| 10 Ah | 32 Wh |
| 50 Ah | 160 Wh |
| 100 Ah | 320 Wh |
| 200 Ah | 640 Wh |
Why it matters
Why this conversion needs a voltage
Watt-hours are the honest way to compare batteries, because amp-hours quietly depend on voltage. Converting Ah to Wh at your actual chemistry lets you size solar storage, compare packs fairly, and check what an inverter can actually run and for how long.
Real-world use
Where you'll use it
Compare a 12 V lead-acid bank against a 48 V lithium bank in real energy (Wh), not amp-hours.
Size a solar battery to a daily Wh load once you know the pack voltage.
Convert a battery's Ah rating to Wh to check airline or shipping energy limits.
Estimate runtime: divide pack Wh by an appliance's watts.
FAQ
Common questions about ah to wh
What voltage should I use for my battery?
Use the nominal (not peak) voltage of your chemistry: about 3.2 V per LiFePO₄ cell, 3.7 V per Li-ion cell, 2.0 V per lead-acid cell (so 12 V for a 6-cell pack), 2.4 V for LTO and 1.2 V for NiMH. Tap a preset above or enter your pack voltage.
Is 100Ah the same as 100Ah at any voltage?
No — that's the trap. 100 Ah stores far more energy at 48 V than at 12 V. Always convert to watt-hours before comparing batteries of different voltages.
How do I get runtime from watt-hours?
Divide the battery's usable Wh by the load's watts. A 1,280 Wh battery running a 100 W device lasts roughly 12.8 hours before efficiency losses.
Related routes
Keep going
Unitly.fyi · results update live — set your own voltage or battery chemistry above.