In CGS(French) system of units, length is calculated in centimetres (cm), mass in grams (g) and time in seconds (s).
In MKS(Metric) system of units, length is calculated in metres (m), mass in kilograms (kg) and time in seconds (s).
In FPS(British) system of units, length is calculated in foot (ft), mass in pounds (lb) and time in seconds (s).
In SI system of units, length is calculated in metres (m), mass in kilograms (kg) and time in seconds (s). This system is widely accepted around the world.