Geotechnical Unit Converter

Definitions used

\( x_{to} = x_{from}\, f_{from} / f_{to} \): each unit is stored as its size \( f \) in the SI unit of its quantity, so any pair converts through SI. Slope and temperature scales are not proportional and use their own formulae.
Exact definitions: \( 1\ \text{ft} = 0.3048\ \text{m} \), \( 1\ \text{lb} = 0.45359237\ \text{kg} \), \( g = 9.80665\ \text{m/s}^2 \), \( 1\ \text{lbf} = 4.4482216\ \text{N} \); kip = 1000 lbf, US (short) ton = 2000 lb, kgf = 9.80665 N, US gallon = 231 in³, year = 365.25 days.
\( \gamma = \rho g \); intrinsic permeability \( k = K\mu/(\rho_w g) \) for water at 20 °C (\( \mu = 1.002 \times 10^{-3} \) Pa·s, \( \rho_w = 998.2 \) kg/m³).