Drone Motor Calculator

How to Size Drone Motors

Motor thrust must exceed total aircraft weight. For stable hover at half throttle, most builds target a 2:1 thrust-to-weight ratio. FPV and racing pilots often use 4:1 or higher for snappy control.

Drone Motor Thrust Formulas

$$\text{Total weight (g)} = \text{frame} + \text{battery} + \text{equipment}$$ $$\text{Total thrust (g)} = \text{total weight} \times \text{thrust-to-weight ratio}$$ $$\text{Thrust per motor (g)} = \frac{\text{total thrust}}{\text{number of motors}}$$

Pair motor selection with flight time planning using the Drone Flight Time Calculator and Battery Size Calculator.

Frequently Asked Questions

What thrust-to-weight ratio should I use?

Use 2:1 for gentle aerial photography, 3:1 for beginner FPV, 4:1 to 5:1 for racing, and up to 7:1 for extreme aerobatics. Higher ratios give more control but drain batteries faster.

Why is motor thrust measured in grams?

RC motor specs list thrust in grams or ounces because it directly compares to aircraft weight. A motor rated at 550 g thrust can lift 550 g in ideal conditions.

Should I include battery weight?

Yes. All-up weight must include frame, battery, camera, and payload. Omitting battery weight leads to underpowered motor choices.

How many motors does a quadcopter use?

Most consumer drones use four motors. Hexacopters use six and octocopters use eight. Divide total thrust by motor count to get per-motor requirements.

What if my chosen motor is slightly heavier than planned?

Recalculate with updated weight. A heavier motor increases total weight and raises required thrust. Iterate until motor thrust still exceeds the new requirement.

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How to Size Drone Motors

Drone Motor Thrust Formulas

Frequently Asked Questions

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