// multi-utility computation suite · offline · instant · precise
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sci.ground-reaction-force-gait Calculator
Calculates ground reaction force during gait as a fraction of body weight from walking speed and gait phase using biomechanical models. Peak vertical GRF during walking: ~1.2 BW; running: ~2.5–3.0 BW — tibial stress fracture risk scales with GRF magnitude and duty cycle.
Inputs
Bw N
Body or object weight. For health calculators, usually in kg or lbs.
Peak Grf Bw
Reference formula or conversion factor shown for context.
Contact Time Ms
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Step Freq Hz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Results
peak ground reaction force GRF (N)
The force exerted by a support on a structure. Equal and opposite to the applied load at that point (Newton's Third Law).
vertical impulse (N·s)
Sample size or count used in the calculation.
average GRF (N)
The arithmetic mean -- sum divided by count.
average loading rate (N/s)
The arithmetic mean -- sum divided by count.
GRF = peak × BW
Reference formula or conversion factor shown for context.
injury risk
Overall risk level based on the computed score or classification. Higher risk may call for mitigating actions or additional review.