LiPo C-rating calculator
Enter the pack's cells, capacity and C rating from the label. Add your motor's current draw to check the pack is up to it.
Result
Fill in the numbers above to see the result.
How it works
Max continuous current = C rating × capacity in amp-hours. A 2200 mAh 30C pack can supply 2.2 × 30 = 66 A.
Labels are optimistic, so aim for at least 1.5 times your motor's full-throttle current. The C rating your motor needs = full-throttle current ÷ capacity in Ah.
Energy in watt-hours = cells × 3.7 V × capacity in Ah. Airlines go by Wh: always check your airline's rules and carry LiPos in hand luggage, never in the hold.
Charge at 1C (capacity in amps) unless the label says the pack takes more.
Keep every model's numbers in one place
RC Flyer Pro is a free logbook and hangar for RC pilots: your models, batteries, flights and flying field, with GPS flight replays in 3D.
Start free
More calculators
CG calculatorFind the balance point of any wing - straight, tapered, swept or a flying wing - from a few measurements.
Wing loading calculatorWing loading in g/dm² and oz/ft², plus cubic wing loading - the fairest way to compare models of different sizes.
Flight time calculatorHow long a LiPo will last from its capacity and your average current - and what to set your timer to.
Prop thrust calculatorEstimate static thrust and pitch speed for any prop, and the thrust-to-weight ratio of your model.