Science & Engineering Calculators
Physics, chemistry, electricity, and weather calculations.
26 free calculators in this category — all run in your browser.
Density CalculatorCalculate density from mass and volume, with common unit equivalents.Mass CalculatorCalculate mass from material density and volume.Force CalculatorCalculate force from mass and acceleration using Newton's second law.Acceleration CalculatorCalculate average acceleration from velocity change and elapsed time.Velocity CalculatorCalculate average velocity from displacement and elapsed time.Work CalculatorCalculate mechanical work from force, displacement, and angle.Power CalculatorCalculate average power from work and time, with horsepower conversion.Kinetic Energy CalculatorCalculate motion energy from mass and velocity.Potential Energy CalculatorCalculate gravitational potential energy from mass, height, and gravity.Speed CalculatorCalculate average speed from distance and time and convert to mph or m/s.Horsepower CalculatorCalculate shaft horsepower from torque and engine RPM.Engine Horsepower CalculatorEstimate engine output from torque and RPM using the standard horsepower relation.Ohm's Law CalculatorSolve voltage, current, resistance, or power from two known electrical values.Voltage CalculatorCalculate electrical voltage from current and resistance using Ohm's law.Current CalculatorCalculate electrical current from voltage and resistance using Ohm's law.Resistance CalculatorCalculate electrical resistance from voltage and current using Ohm's law.Resistor CalculatorDecode a four-band resistor's resistance and tolerance from its color bands.Electricity CalculatorEstimate appliance kWh usage and monthly electricity cost.Voltage Drop CalculatorEstimate copper wire voltage drop from length, current, voltage, and AWG gauge.Molarity CalculatorCalculate solution concentration in moles per liter.Molecular Weight CalculatorEstimate molar mass from a chemical formula and common element symbols.Ideal Gas Law CalculatorSolve one variable in PV = nRT using consistent liter-atmosphere units.Wind Chill CalculatorEstimate apparent temperature from air temperature and wind speed.Heat Index CalculatorEstimate apparent heat from air temperature and relative humidity.Dew Point CalculatorEstimate dew point from air temperature and relative humidity.BTU CalculatorEstimate a room's heating or cooling capacity from area and simple adjustment factors.