Skip to content
RC Calculator
All calculators

LiPo Voltage Calculator

Work out nominal and fully charged pack voltage from the LiPo cell count.

Battery

Result

Nominal voltage
3.7V
1.00S LiPo nominal
Fully charged voltage
4.2V

Nominal 3.7 V/cell; fully charged 4.2 V/cell. Working voltage sits between and sags under load.

Formula

  1. 1.Nominal Voltage = Cell Count × 3.7 V
  2. 2.Full Charge Voltage = Cell Count × 4.2 V

Worked example

  1. 1.Inputs: 4S LiPo.
  2. 2.Nominal = 4 × 3.7 = 14.8 V; full charge = 4 × 4.2 = 16.8 V.

Assumptions and limits

  • Do not apply LiPo constants to LiHV, LiFe or NiMH packs.
  • Under load the real voltage is below nominal — use it for matching, not runtime math.

Related tools

Guides and concepts

FAQ

Is a full 2S 8.4 V or 7.4 V?

Both are correct at different states: 8.4 V fully charged, 7.4 V nominal.

Assumptions

  • LiPo chemistry only — other chemistries use different cell voltages.
  • Nominal is a label value, not a measured operating voltage.