Thread: Rather basic conversion formula.

Hey all. Good to be here. Do need some random conversion help, shouldn't be particularly difficult.

Basically I want to convert litres per 100km into miles per imperial gallon

The basic conversions are:
1 mile = 1.6km
1 imperial gallon = 4.55L

1km = 0.62mi
1L = 0.22 imperial gallon.

All I want really is a formula that can convert xL/100km into ympg

I would like to know how to justify a formula starting with just the above values. I do know what the final formula is, but the L/100km being a fraction kind of throws my understanding of how the formula would work.

Thanks a lot

Hello dredgy

Welcome to Math Help Forum!

Originally Posted by dredgy

Hey all. Good to be here. Do need some random conversion help, shouldn't be particularly difficult.

Basically I want to convert litres per 100km into miles per imperial gallon

The basic conversions are:
1 mile = 1.6km
1 imperial gallon = 4.55L

1km = 0.62mi
1L = 0.22 imperial gallon.

All I want really is a formula that can convert xL/100km into ympg

I would like to know how to justify a formula starting with just the above values. I do know what the final formula is, but the L/100km being a fraction kind of throws my understanding of how the formula would work.

Thanks a lot

If we use L to cover km, that's L to cover miles

So how many gallons are there in L? Answer .

So we've covered miles using gallons, which is miles per gallon.

So there's our formula:







So, for example, 8 L per 100 km mpg

Grandad