LiPo Battery Energy Calculator (Wh & C-rating)
Watt-hours, voltage window and max current of any LiPo from S-count, mAh and C-rating — with airline 100/160 Wh limits checked.
Store LiPos at ~3.8 V/cell (storage charge), never full or empty for weeks. Discard (safely) any puffed pack. The Wh number printed on commercial packs uses the same V(nom)×Ah math — handy when the label only shows mAh. For flights, airlines count installed + spare batteries differently; spares must be carry-on with terminals protected.
LiPo Energy Calculator computes watt-hours, voltage window and max current of a LiPo from S-count, mAh and C-rating — free, instant and private in your browser. Drone and RC pilots, airline travellers with batteries, and e-mobility builders use it to skip the datasheet algebra: type your numbers, read the answer with the substituted formula shown step by step, and share an exact permalink of the calculation.
About LiPo Battery Energy Calculator (Wh & C-rating)
LiPo Energy Calculator computes watt-hours, voltage window and max current of a LiPo from S-count, mAh and C-rating using the standard engineering relation: Wh = 3.7·S·Ah; I(max) = C·Ah; full = 4.2 V/cell, empty ≈ 3.0–3.3 V/cell. Worked live: a 4S 5000 mAh 50C pack stores 74 Wh and can theoretically deliver 250 A. The result recalculates on every keystroke, the worked-example panel shows your numbers substituted into the formula, and the Copy permalink button encodes the inputs in the URL so a colleague opens exactly your calculation. Everything runs client-side — nothing you type leaves your device.
How to use LiPo Battery Energy Calculator (Wh & C-rating)
- 1Enter your values — the tool starts with realistic defaults for this exact use case, so the worked example is meaningful immediately.
- 2Read the live result and the worked-example panel, which substitutes your numbers into the formula step by step.
- 3Adjust any input to compare scenarios, then use Copy result or Copy permalink to share the calculation.
Why use LiPo Battery Energy Calculator (Wh & C-rating)?
- ✓Implements the real formula — Wh = 3.7·S·Ah — with the substitution shown, not a black box
- ✓Built for drone and RC pilots, airline travellers with batteries, and e-mobility builders
- ✓Copy result and permalink buttons — share the exact calculation in a README, forum answer or design review
- ✓100% free, no sign-up, runs entirely in your browser (works offline once loaded)
Frequently asked questions
How do you calculate lipo energy?+
Watt-hours, voltage window and max current of a LiPo from S-count, mAh and C-rating follows Wh = 3.7·S·Ah; I(max) = C·Ah; full = 4.2 V/cell, empty ≈ 3.0–3.3 V/cell. For example, a 4S 5000 mAh 50C pack stores 74 Wh and can theoretically deliver 250 A. The calculator applies the same relation and shows the substituted arithmetic so you can verify every step.
Can I take my LiPo on a plane?+
Spares must be carry-on with terminals protected. ≤100 Wh flies freely; 100–160 Wh needs airline approval (usually max two spares); >160 Wh is forbidden on passenger aircraft. The Wh figure this tool computes is exactly what security checks.
Are advertised C-ratings real?+
Treat them as marketing ceilings — many '50C' packs sag badly past 25C sustained. Voltage sag under load and post-flight pack temperature (warm is fine, hot is not) tell the truth; size packs so cruise sits well under half the claimed C.
Is the LiPo Energy Calculator free and private?+
Yes — completely free with no sign-up or usage limits, and it runs entirely in your browser: the values you enter are never uploaded or stored on a server.
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