Science & Engineering Calculators

Ohm's Law Calculator Solve for voltage, current or resistance and get the power — pick what to find.

Voltage Drop Calculator Estimate the voltage lost along a wire run from length, current and conductor size.

Resistor Color Code Calculator Decode a 4-band resistor colour code into resistance and tolerance.

Capacitor Charge Calculator Find charge, energy, time constant and the charging voltage of an RC circuit.

Electrical Power Calculator Calculate power in watts from voltage and current, with kilowatts and horsepower.

Force Calculator (F = ma) Compute force from mass and acceleration using Newton's second law.

Kinetic Energy Calculator Find the kinetic energy and momentum of a moving object.

Potential Energy Calculator Calculate gravitational potential energy from mass, height and gravity.

Density Calculator Solve for density, mass or volume — density is mass divided by volume.

Molarity Calculator Find the molar concentration of a solution from mass, molar mass and volume.

Ideal Gas Law Calculator Solve PV = nRT for pressure, volume, moles or temperature.

Wavelength & Frequency Calculator Convert between wavelength and frequency and get the photon energy.

pH Calculator Convert between hydrogen-ion concentration and pH, with pOH and [OH⁻].

Torque Calculator Calculate torque from force, lever length and the angle of application.

Gear Ratio Calculator Work out gear ratio, output speed and torque multiplication from tooth counts.

Projectile Motion Calculator Find the range, maximum height and flight time of a launched projectile.

Subnet Calculator (IPv4 CIDR) Get the network, broadcast, mask and host range for an IPv4 address and CIDR prefix.

Binary / Hex / Decimal Converter Convert a number between binary, octal, decimal and hexadecimal.