### How many kg in a kN?

Quick physics lesson today. Often we see carabiners, rings, rope, etc. rated for a certain number of kilo Newtons (kN). What does that number mean and how does it affect me?

The quick and dirty answer, working with normal gravity, is that **1 kN = 101 kg = 224 lbs**. These are **conservative masses**, meaning I have rounded down. To convert __kg to kN__, multiply by 0.00981, to convert __kN to kg__, multiply by 101.97.

Why is this so? Glad you asked. While a kg is a unit of mass, a kN is a unit of force. The unit of measurement for kN is the Newton, defined as __the force of earth's gravity required to move 100g__ (0.1 kg). Since force is defined as **mass** multiplied by **acceleration**, we must apply some sort of acceleration to our unit of mass (kg) in order to get kN. Usually, this acceleration is gravity (9.81 m/s). With this in mind, we can see that a 1 kg mass under gravity is equal to:

- F = m * a
- F = 1 kg * (9.81 m/s)
- F = 1000 g * 9.81 m/s
- F = 9.81 N
- F = 0.00981 kN

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Shouldn't units for acceleration be m/s^2?

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