For those of you (like me) who can't work these conversions out, here's a helping hand for weight and liquid.
Metric – Imperial weight
14g = ½oz
28g = 1oz
57g = 2oz
85g = 3oz
99g = 3 ½oz
113g = 4oz
142g = 5oz
170g = 6oz
198g = 7oz
227g = 8oz
255g = 9oz
284g = 10oz
312g = 11oz
340g = 12oz
369g = 13oz
397g = 14oz
425g = 15oz
454g = 1lb
1kg = 2lb 3oz
1.8kg = 4lb
Metric – Imperial liquid
28ml = 1fl oz
57ml = 2fl oz
85ml = 3fl oz
114ml = 4fl oz
142ml = 5fl oz
170ml = 6fl oz
199ml =7 fl oz
227ml = 8fl oz
255ml = 9fl oz
284ml = 10fl oz
312ml = 11fl oz
341ml = 12fl oz
369ml = 13fl oz
398ml = 14fl oz
426ml = 15fl oz
354ml = 16fl oz
483ml = 17fl oz
511ml = 18fl oz
540ml = 19fl oz
568ml = 1pt
1 litre = 35fl oz
1.5 litres = 2 ¾ fl oz