None.
A kilogram is a measure of mass. A litre is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider a litre of air. How many kilograms? Next consider a litre of lead. How many kilograms?
The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.
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7 kg
7 stone 12 is 50 (49.9)kg
7 liters = 1.85 US gallons (approx). So 7 liters is smaller.
5 feet 7 inches equals 67 inches.
2,296.875 cm3 About 2295 litres