Engineering calculators

Required V-belt length between two pulleys.

Total capacitance in series or parallel.

Concrete needed for a slab, with a waste allowance.

Gear ratio and output speed from tooth counts.

Solve for voltage, current or resistance.

Litres of paint needed for a room.

Volumetric flow from pipe size and velocity.

Power from work done over time.

Real, apparent power and the resulting power factor.

Decode 4-band resistor colour codes into resistance.

Surface speed from rotational speed and diameter.

Hooke's law stiffness from force and extension.

Weight of a round steel bar.

Line current from three-phase power and voltage.

Torque from force applied at a distance.

Turns ratio and secondary voltage.

Output voltage across a two-resistor divider.

Electrical power from voltage and current.