- One hex can be considered to be either a yard or a metre with little actual effect on game mechanics unless large numbers are involved. For metres into yards divide by 0.914. For yards into metres multiply by 0.914. There are 1.094 yards in a metre.
- An item's weight in kilograms can be converted to pounds by multiplying by 2.2. Divide by 2.2 for pounds into kilograms.
- Tons in GURPS are “short tons” of 2,000 pounds or 907.185 kg. Multiply metric tonnes (megagrams!) by 1.0231 to convert to short tons or divide by 0.907.
- Speeds in kilometres per hour can be converted to miles per hour by dividing by 1.6. The mph result can then be halved to get the more game-useful yards/sec equivalent: 4 mph=2 yd/s. (For kph to m/s multiply by 0.277 ̇ or divide by 4 for quick and dirty.)
˚C = (˚F -32)/1.8
More convenient is to remember the approximation that:
1˚C = 1.8˚F
Days of Travel = Distance in AU/ (delta-V (mps) ÷ 1100)
Falling Distances and Velocity.