That’s the problem with it really….

No one under 55 really understands imperial that well.

Me? I order things by weight in grams. Ounces and pounds literally mean nothing to me at all. I buy milk and other stuff like that in litres

I would find it hard to go imperial…

It's really straightforward:

weight

437.5 grains in an ounce

16 ounces in a pound

14 pounds in a stone

8 stone in a hundredweight

20 hundredweight in a ton.

money

12 pence in a shilling

20 shillings in a pound

21 shillings in a guinea

So its a piece of piss to calculate things. If something costs 7 pence an ounce and you need to know the cost of 3st 9lbs 3oz you just do the following:

First turn everything into ounces

3st = 3x14x16 ounces = 672oz

9lbs = 9x16 ounces = 144oz

3 oz

Add them together 672 + 144 + 3 = 819 oz

multiply by pence/ounce

819 x 7 = 5,733 pence.

divide by 12 to find number of shillings

5,733/12 = 477.75

0.75 shillings = 0.75 x 12 = 9 pence

Divide 477 by 20 to find number of pounds

477/20 = 23.85

0.85 pounds = 0.85 x 20 = 17 shillings

So 3st 9lbs 3oz at 7 pence an ounce = £23 17s 9d

Couldn't be easier.

Unless you have 23.219 kg at 101p/kg*

23.219 g x 101p/kg = £23 52p

So much easier with the old money...

For people under 55 this is really what we had to do to calculate cost by weight in imperial.

*1d (old penny) = £1/244 1p (new penny) = £1/100 so 7d/oz = 101p/kg