Fall Factor
0.13
Impact
3.1 kN
Severity
Low
Fall Factor
0.13
Low severity
Impact Force
3.1 kN
UIAA Max
12.0 kN
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Inputs
Result
Fall factor = 10/80 = 0.13. Impact force approximately 4.8 kN.
Inputs
Result
Fall factor = 30/30 = 1.0. Impact force approximately 8.5 kN.
Fall factor is the ratio of fall distance to rope length paid out. A factor of 0 means no fall, while 2.0 is the theoretical maximum (factor 2 fall directly onto the belay).
| Fall Factor | Severity | Impact Force | Common Scenario |
|---|---|---|---|
| 0.1–0.3 | Low | 3–5 kN | Short sport fall |
| 0.5–1.0 | Moderate | 5–8 kN | Above last bolt |
| 1.0–2.0 | Severe | 8–12 kN | Factor 2, no gear |
Sport climbers under 170 lbs can use 9.4mm ropes. Heavier climbers or trad routes benefit from 9.8–10.2mm for durability and lower impact forces.
For sport climbing, your rope needs to be at least 2x the route height for lowering. A 60m rope covers most single-pitch routes up to 95 feet.
The UIAA maximum allowable impact force for a single rope is 12 kN. This is measured with a factor 1.77 fall on an 80 kg mass. Lower impact force ratings are better.
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Last Updated: Mar 20, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.