Belay Braking Force Calculator
Calculate the braking and holding forces for different belay devices based on rope diameter, climber weight, and fall factor. Compare tubular, assisted-braking, and figure-8 devices.
Inputs
Results
Braking Force
1.95 kN
Belayer Holding Force
0.84 kN
How to Use This Calculator
- Select your belay device type: tubular (ATC-style), assisted-braking (Grigri), or figure-8.
- Enter the rope diameter in mm (typically 9.2–10.5 mm for a single rope).
- Input the fall factor for the scenario you are evaluating (use the Fall Factor calculator if needed).
- Read Braking Force in kN — the force the belay device can apply to arrest a fall.
- Check Holding Force to confirm it stays within safe limits for your belay station and anchor.
- Review Device Efficiency (%) to understand how much of the rope's friction is being utilized.
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