Useful approximate conversions
25-30 g = 1 ounce (real value 28.35 g)
1 kg = 2 pounds (real value 907.2 g)
1 liter = 2 pints (real value 1136.4 ml)
25 mm (2.5 cm) = 1 inch (real value 25.4 mm)
Other useful approximations
1/4 pint = 1 1/2 dl or 150 ml
1/2 pint = 1/4 l or 250 ml or 2 1/2 dl
1/4 pound = 125 g
1/2 pound = 250 g or 1/4 kg