Physics Calculators
Velocity, mechanics, energy, electricity and physics tools.
Surface Area to Volume Ratio Calculator
Enter the cube edge or sphere radius to compute surface area, volume and the SA:V ratio. SA:V = 6/a (cube), 3/r (sphere).
Farm Drainage Discharge Calculator
Enter the drainage coefficient (mm/day) and farm area (ha) to compute daily discharge Q = coefficient × area × 10 (m³/day) and L/s for drainage design.
Capillary Rise Calculator
Compute capillary rise h = 2σcosθ/(ρgr) in a tube.
Darcy's Law (Flux) Calculator
Compute Darcy flux and volumetric flow from K, gradient and area.
Manning Flow Calculator
Enter Manning n, hydraulic radius, slope and flow area to compute the open-channel velocity and discharge via Manning's equation.
Falling Head Conductivity Calculator
Enter standpipe area, sample geometry, time and head levels to compute hydraulic conductivity via the falling-head (constant-head) test.
Rectangular Weir Discharge Calculator
Enter the discharge coefficient C, crest width L and head H to compute flow over a rectangular weir from Q=C·L·H^(3/2) (m³/s), used for irrigation and open-channel flow measurement.
Orifice Discharge Calculator
Enter discharge coefficient, orifice area and head to compute the discharge Q = C_d·A·√(2·g·h).
Hazen–Williams Calculator
Estimate head loss in a pipe using the Hazen–Williams empirical formula.
Pipe Reynolds Number Calculator
Enter velocity, diameter and kinematic viscosity to compute the pipe-flow Reynolds number Re = v·D/ν.
Chézy Flow Calculator
Compute open-channel velocity v = C·√(R·S) (Chézy formula).
Froude Number Calculator
Compute the Froude number Fr = v/√(gL).