All Calculators

Convert between Pa, kPa, bar, psi, atm, mmHg, m H₂O

Convert between m³/s, m³/h, m³/day, L/s, L/min, GPM

Convert between m, mm, cm, km, inch, ft, yard, mile

Convert between m², mm², cm², km², hectare, ft², acre

Convert between m³, L, mL, gallon, ft³, barrel

Convert between °C, °F, and Kelvin

Convert between kg, g, mg, tonne, lb, oz

Convert between W, kW, MW, hp, BTU/h

Convert between J, kJ, MJ, kWh, cal, kcal, BTU

Convert dynamic viscosity between Pa·s, cP, and Poise

Convert between kg/m³, g/cm³, lb/ft³, and kg/L

Convert between m/s, km/h, ft/s, mph, and knots

Calculate circle area given diameter

Calculate diameter from circle area

Calculate circumference from diameter or radius

Calculate area and perimeter of a rectangle

Calculate triangle area from base and height

Calculate volume and surface area of a cylinder

Calculate volume of cylindrical or rectangular tanks

Calculate flow rate from velocity and pipe area (Q = A × v)

Calculate flow velocity from flow rate and pipe diameter

Calculate internal cross-sectional area of a pipe

Calculate Reynolds number to determine laminar or turbulent flow

Energy balance between two points in a fluid system

Calculate hydraulic diameter for non-circular cross-sections

Calculate flow through an orifice using discharge coefficient

Calculate flow over rectangular or V-notch weirs

Convert pressure (bar, kPa, psi) to head (m H₂O)

Convert head (m H₂O) to pressure (bar, kPa, psi)

Calculate head loss using Hazen-Williams equation

Calculate head loss using Darcy-Weisbach equation

Calculate Darcy friction factor from Reynolds number and pipe roughness

Calculate flow velocity and discharge in open channels

Recommend pipe diameter from flow rate and velocity limits

Calculate head loss from pipe fittings using K-factor method

Convert minor losses to equivalent straight pipe length

Standard pipe wall thickness, OD, and ID by schedule

Calculate pump power from flow, head, and efficiency

Predict pump performance at different speeds using affinity laws

Calculate Net Positive Suction Head Available (NPSHa)

Calculate system head at a given flow (static head + friction)

Calculate specific speed (Ns) for pump type classification

Convert between L/s, m³/h, m³/day, and GPM

Calculate reservoir/tank storage volume and capacity

Nominal pipe diameter (DN) to actual dimensions reference

Calculate pressure surge from sudden valve closure

Estimate daily water demand from population and per-capita consumption

Calculate ILI from CARL and UARL for NRW benchmarking

Estimate leakage from Minimum Night Flow analysis in a DMA

Hazen-Williams C-values and absolute roughness for common pipe materials

Calculate hydraulic retention time in a tank or reservoir

Calculate torque from force and distance

Convert RPM to rad/s and vice versa

Calculate power from torque and speed

Calculate speed ratio and driven pulley RPM for belt drives

Calculate basic bearing life in hours

Calculate voltage, current, or resistance (V = I × R)

Calculate electrical power (P = V × I)

Calculate 3-phase electrical power

Calculate minimum cable cross-section for voltage drop limit

Calculate capacitor kVAR needed to improve power factor

Calculate slope percentage, ratio, and angle

Calculate concrete volume for slab, column, or beam

Calculate weight of steel reinforcement bars

Calculate area, wetted perimeter, and hydraulic radius of a trapezoidal channel

Estimate peak stormwater runoff from a catchment

Calculate cut/fill volume between two cross-sections