Engineering & construction
Area, volume, materials and electrical calculations.
Concrete volume calculator
Concrete needed for a slab, with a waste allowance, in cubic metres and cubic yards.
Paint coverage calculator
Litres or gallons of paint for a surface area, number of coats and coverage rate.
Resistor color code reader
Read a resistor's value and tolerance from its 4-band or 5-band color code, using the standard IEC 60062 convention.
Tile calculator
How many tiles to buy for a floor or wall, including a waste allowance.
Voltage divider calculator
Output voltage and current of a two-resistor divider.