Resistor Color Code Calculator
Decode 4, 5 and 6-band resistors, including tolerance and temperature coefficient.
Open Tool →TOOLS
Engineering calculations, all in one place.
A focused set of quick technical calculators for electronics, mechanics, 3D printing, automation and everyday engineering work.
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Ohm’s Law Calculator
Enter any two of voltage, current, resistance and power to calculate the remaining values.
Open Tool →LED Resistor Calculator
Calculate resistance, actual current and a safe power rating for single or series LED strings.
Open Tool →Voltage Divider Calculator
Calculate divider output, current and resistor power, or solve for a missing resistor in reverse mode.
Open Tool →Series / Parallel Resistance
Find the series or parallel equivalent of 2–20 resistors.
Open Tool →Electrical Power Calculator
Calculate power and energy for DC, single-phase and three-phase systems.
Open Tool →Cable Voltage Drop
Estimate voltage drop in copper or aluminium conductors.
Open Tool →555 Timer Calculator
Calculate NE555 astable timing or monostable pulse duration.
Open Tool →RC Time Constant
Calculate RC time constant and inspect charging levels from 1τ to 5τ.
Open Tool →Stepper Motor Calculator
Calculate resolution and pulse count from motor, microstepping and transmission data.
Open Tool →Encoder Calculator
Derive encoder resolution from PPR/CPR, quadrature factor and mechanical travel.
Open Tool →Pneumatic Cylinder Force
Calculate extension and retraction forces from bore, rod, pressure and efficiency.
Open Tool →Gear Ratio Calculator
Calculate ratio, output speed and theoretical torque for single or multi-stage gear trains.
Open Tool →Belt & Pulley Calculator
Find pulley ratio and output speed from diameters or timing-belt tooth counts.
Open Tool →3D Print Cost Calculator
Estimate print cost from filament, electricity, machine time, labour, waste and margin.
Open Tool →Filament Length / Weight
Convert between filament weight and length using material density and diameter.
Open Tool →RPM / Linear Speed
Calculate surface speed from diameter and RPM, or solve the inverse.
Open Tool →Torque / Power / RPM
Enter any two of torque, power and RPM to solve the third.
Open Tool →Unit Converter
Instantly convert length, area, volume, pressure, torque, power, energy and temperature.
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