# Online Calculator.

Free *online* physics, Math calculators, velocity equations and density, mass and … Puts the values and the *calculator* will solve for the third in the selected *units*.

Online Fluid Velocity Calculator. Fluid Velocity Formulas: Imperial Units: V = ( 0.409 * Q ) / d2. where: V = velocity, ft/s. Q = flow, gpm. d = pipe inside diameter, in. SI Units: V = ( 35... Read more

Online Pump Temperature Rise calculator. Pump Temperature Rise Formulas: Imperial Units: ΔT = (H * (1 – η ) )/(778 * U* η). where: ΔT = temperature rise, °F. H = total head, ft. η = pu... Read more

Online Pump Torque calculator. Pump Torque Formulas: Imperial Units: τ = (5250 * P) / N. where: τ = torque, ft-lbf. P = pump power, hp. N = pump speed, rpm. SI Units: τ = (9450 * P) / N. whe... Read more

Online Pump Power calculator. Pump Power Formulas: Imperial Units: P = (Q * H * SG) / (3960 * η) where: P = power, horse power. H = head, ft. Q = flow, gpm. SG = specific gravity. η= pump ef... Read more

Online Pump Head calculator. Pump Head Formulas: Imperial Units: H = (2.31 ( Pd – Ps) / SG) + (Vd2 – Vs2) / 2g + (Zd – Zs) – Hf where: H = pump head, ft. Hf = frictio... Read more

Online Net Positive Suction Head Calculator. Net Positive Suction Head Formulas: Net Positive Suction Head Formulas In terms of head. Imperial Units: NPSH= Ha – Hvpa + Hst – Hfs.... Read more