What is a good thrust-to-weight ratio?

For rockets, TWR > 1 is required to lift off; many designs target 1.2–1.6. For drones/RC, higher TWR improves climb and agility.

Does this support KSP or RC/drones?

Yes. Enter your thrust and mass (or weight) in supported units (N, kN, lbf, gf; kg/lb) to compute TWR.

Compute TWR for rockets, drones, quadcopters, RC planes, and KSP. Choose units, use presets, and share your setup.

Thrust

Mass (or enter weight below)

Weight (optional, uses thrust units)

If you enter weight here, the calculator uses it directly (in the same unit as thrust) and ignores mass.

Quick Presets

Thrust-to-Weight Ratio

1.020

TWR = thrust / weight

Thrust (N)

1000.00

Weight (N)

980.66

TWR > 1 required for liftoff. Values depend on sea-level vs vacuum thrust, battery voltage, and prop/airframe efficiency.

How do I calculate TWR?⌄

Convert thrust to newtons and weight to newtons (mass × 9.80665 m/s²), then divide: TWR = thrust / weight.

What TWR should I target?⌄

Rockets often aim for 1.2–1.6 at liftoff. Drones and RC builds may prefer higher TWR for agility and climb performance.