ONE FORMULA, ONE ANSWER
Free Fall Time Calculator
Calculate fall time from rest in uniform gravity. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Fall time from rest t
Enter values and select Calculate.
t = √(2h/g)
Assumptions
Required: h≥0, g>0 and zero initial vertical velocity in uniform gravity. Excluded: air resistance, buoyancy and gravity variation over large heights.
Displayed values are floating-point approximations. Design safety factors and unprovided error contributions are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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