Essentially, the ‘traditional’ or SAE mechanical horse power HP is close enough to the metric horse power to be treated as the same, although they are not exactly equivalent, there being a difference of 10 watts. The French CV (literally, chevaux – horses) is the same as the metric horse power.
In approximate terms, 1hp = 1cv = 0.7kw
The watt/kilowatt is the recognised EU/SI unit of measurement.
Distance and Speed
1 in (inch) = 2.54 cm (centimetres) = 25.4 mm (millimetres)
1 ft (foot) = 0.3048 m (metre) = 30.48 cm (centimetres) = 304.8 mm (millimetres)
1 yd (yard) = 0.9144 m (metre) 1 mi (mile) = 1.609 km (kilometre)
1 NM (nautical mile) = 1.852 km (kilometre)
1 kn (knot) (noued in French) = 1.852 km/h
Speed limits are often (not always) 6 km/h (3 kn) on canals and 10 km/h (5 kn) on rivers.
And please, 3 km/h (1.5 kn) past moored boats.
Volume and Weight
1 gal (gallon) = 4.55 l (litres)
1 pint = 0.6 l (litre) = 600 ml (milliltres) = 60 cl (centilitres)
1 lb (pound) = 0.45 kg (kilogram) = 454 g (grams) [ a 'metric pound' = 500 g ]