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Drone Flight Time and Discharge Telemetry Calculator

Estimate flight time from usable charge and measured battery current or discharge telemetry; keep reserve, aircraft conditions and capacity explicit.

Use this result well

Inputs that matter
Pack and flight conditions, Usable charge to the chosen landing limit (mAh), Additional reserve of usable charge (%), Measured average battery-terminal current (A), and 3 more
Output to expect
Flight time from battery current, Flight time from discharge telemetry
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Flight time from battery current

Estimate flight time using usable battery charge and a measured average battery-terminal current under the intended flight conditions. Nominal voltage and chemistry do not supply an automatic usable fraction.

Minutes = usable mAh × (1 − additional reserve/100) / (average battery A × 1000) × 60.

Flight time from discharge telemetry

Derive average battery current from a measured flight duration and discharged charge, then compare the same profile with a stated usable charge budget. Recharge mAh is not substituted because charger losses use a different basis.

Average battery A = discharged mAh / (flight minutes × 1000/60); estimated minutes = planned charge allowance / measured charge per minute.

Updated: September 2026

Example Scenarios

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ 8.1 minutes estimated

Try this example to see the calculation, then enter actual documented values and preserve the measurement conditions. A failed or unresolved comparison is part of the record.

→ 7.5 minutes for the same consumption profile

FAQ

Estimate flight time using usable battery charge and a measured average battery-terminal current under the intended flight conditions. Nominal voltage and chemistry do not supply an automatic usable fraction. Derive average battery current from a measured flight duration and discharged charge, then compare the same profile with a stated usable charge budget. Recharge mAh is not substituted because charger losses use a different basis.

Use the exact equipment data, measurement point, operating conditions and units described in the selected mode. Record source documents, dates and unresolved conditions in Sources and assumptions. Built-in examples illustrate arithmetic; they are not manufacturer ratings or approved designs.

Use Save planning case for an explicit local history entry. Copy MD keeps current inputs and notes; Download CSV exports the result breakdown. Export portable copies before clearing storage and save a separate case after changing equipment, conditions or measurements.

About Drone Flight Time and Discharge Telemetry Calculator

Estimate flight time using usable battery charge and a measured average battery-terminal current under the intended flight conditions. Nominal voltage and chemistry do not supply an automatic usable fraction. Derive average battery current from a measured flight duration and discharged charge, then compare the same profile with a stated usable charge budget. Recharge mAh is not substituted because charger losses use a different basis.