General Engineering Tools
Interactive calculators for unit conversion, mathematics, fluid mechanics, energy and pressure.
Engineering Unit Converter
Convert common engineering, marine and scientific units instantly.
Engineering Math Tools
Essential mathematical calculators for engineering and scientific applications.
Pythagorean Theorem
Calculate the hypotenuse of a right triangle from two perpendicular sides.
Quadratic Equation
Solve equations in the form ax² + bx + c = 0.
Linear Interpolation
Estimate a value between two known data points.
Percentage Error
Calculate the percentage difference between an experimental value and a reference value.
2D Vector Magnitude & Direction
Calculate vector magnitude and direction from its Cartesian components.
Vector Components
Resolve a vector into horizontal and vertical components.
Slope Between Two Points
Calculate the slope of a straight line passing through two points.
Fluid Mechanics Tools
Practical fluid mechanics calculators for engineering and marine applications.
Reynolds Number
Calculate Reynolds number using fluid density, velocity, characteristic length and dynamic viscosity.
Dynamic Pressure
Calculate dynamic pressure from fluid density and flow velocity.
Bernoulli Equation
Calculate pressure at point 2 for steady, incompressible and inviscid flow.
Darcy–Weisbach Head Loss
Calculate frictional head loss in a pipe using the Darcy–Weisbach equation.
Pipe Flow Velocity
Calculate average velocity in a circular pipe from volumetric flow rate and diameter.
Hydraulic Diameter
Calculate hydraulic diameter for a fully wetted rectangular duct.
Darcy Friction Factor
Estimate Darcy friction factor using laminar theory or the Swamee–Jain approximation for turbulent flow.
Energy Engineering Tools
Practical energy, work, power and battery calculators for engineering applications.
Kinetic Energy
Calculate translational kinetic energy from mass and velocity.
Gravitational Potential Energy
Calculate gravitational potential energy relative to a selected reference elevation.
Mechanical Work
Calculate work done by a constant force acting through a displacement.
Power
Calculate average power from transferred energy or work over time.
Energy Efficiency
Calculate efficiency from useful output energy or power and total input.
Battery Energy
Estimate nominal battery energy from voltage and amp-hour capacity.
Battery Runtime
Estimate operating time from battery capacity, usable depth of discharge, system efficiency and electrical load.
Energy Engineering Tools
Practical energy, work, power and battery calculators for engineering applications.
Kinetic Energy
Calculate translational kinetic energy from mass and velocity.
Gravitational Potential Energy
Calculate gravitational potential energy relative to a selected reference elevation.
Mechanical Work
Calculate work done by a constant force acting through a displacement.
Power
Calculate average power from transferred energy or work over time.
Energy Efficiency
Calculate efficiency from useful output energy or power and total input.
Battery Energy
Estimate nominal battery energy from voltage and amp-hour capacity.
Battery Runtime
Estimate operating time from battery capacity, usable depth of discharge, system efficiency and electrical load.