Units and technical calculations

13 primary tools

Unit conversions and calculations for energy, consumption and measurements. Choose a tool and read its instructions, examples and limits before you begin.

Search for a tool

EV charging cost calculator

Estimate charging costs using battery capacity, the charge percentage needed and your price per kWh. Adjust the tariff and charging losses.

EV charging time calculator

Estimate charging time from battery capacity, starting and target charge levels and effective power. Compare scenarios with clear assumptions.

Watts, amps and volts calculator

Calculate amps, watts or volts from the values you know. Choose DC or AC and include power factor when the selected circuit requires it.

Dimensional and volumetric weight calculator

Enter package dimensions and actual weight. Use your carrier’s divisor to calculate dimensional weight and compare the weight used for billing.

Fuel consumption

Calculate L/100 km, km/L and fuel cost from distance, fuel used and price. Distance and fuel must refer to the same trip; cost in euros.

kW to horsepower

Convert kW, metric horsepower CV/PS and mechanical horsepower hp. CV and hp are different units; select the correct one for vehicle data.

Miles to kilometers

Convert international miles and kilometers in both directions. One mile is exactly 1.609344 km; these are not nautical miles.

Celsius and Fahrenheit

Convert Celsius and Fahrenheit with a kelvin value. Absolute zero is −273.15 °C or −459.67 °F; lower temperatures are rejected.

Liters and gallons

Convert liters and gallons choosing the US liquid or UK imperial gallon. They differ: 3.785411784 L versus 4.54609 L.

Unit converter

Convert 11 quantities: length, mass, volume, temperature, duration, speed, area, pressure, energy, power and data. Distinguishes decimal and binary prefixes.

Scale conversion calculator

Convert real measurements to scale, scale to real, or between two scales. Choose units and ratios for drawings, maps and models.

Download time calculator

Estimate file transfer time from size and speed. Distinguish MB, MiB and Mbps and adjust transfer efficiency.

Resistor color code calculator

Read four-band and five-band resistors. Calculate nominal resistance, tolerance and the minimum and maximum values.