battery runtime, energy and charging-time calculators
Calculate battery energy and idealized runtime
Convert capacity to watt-hours, estimate runtime, charging time and daily energy demand.
Tools
Tools
Watt-hours from Ah
Convert amp-hours and nominal voltage to watt-hours.
Open →ToolsBattery Runtime
Estimate runtime from usable energy and average power.
Open →ToolsUsable Energy
Apply a usable-capacity percentage.
Open →ToolsIdealized Charge Time
Estimate charging duration from energy and average charge power.
Open →ToolsDaily Device Energy
Calculate energy from power and daily use time.
Open →Guides
Guides
Ah and Wh are not interchangeable
Watt-hours include voltage and are useful for energy comparisons.
GuidesWhat runtime estimates assume
Energy divided by average power is an idealized model.
GuidesCharging time depends on average power
Real charging power may vary during a session.
GuidesBuild a battery energy budget
Calculate each load separately before summing.