Google conversions don’t work because they’re too simplistic. To work out pounds back into stone you need to do the following:
173lbs would be 173 divided by 14 = 12.357. This is usually where google stops. Then you need to take the .357 and times it by 14 which gives you 4.9. So 173lbs is 12stine 4.9lbs.
So google says you weigh 12st 3lbs when actually it’s more like 12 stone 5lbs. This varies widely depending on where the digits after the point end up so you can be half a stone out if going by google and it’s always in your favour. The sad truth is by the formula above.
I’m such a geek