Grms v Kgs

richard519

Why do supermarkets do this?  Why can't there be a like for like weight measure?  Both tins weigh in at 400 grams but the but the "price per" differs between grams and Kgs!  Surely if the weight is less than 1 kg the "price per" should be in grams and not kilograms!
 

Alter_ego

Simple, just multiply the 100g figure by 10 to get kg price. Alternatively 2 & 1/4 pounds of jam weighs about a kilogram.

maisie_cat

At least that one is easy to mentally compare, the ones I find most annoying are weight versus volume or weight versus each.
Unless you know the ratio you cannot compare at all, I've taken to using the fruit & veg scales to weigh stuff in the past.

Teapot55

The reason you multiply by 10 is because comparing /100g with /kg, there’s 10 lots of 100g in a kg (kilogram) because a kg is 1000 grams. 

I’m not being patronising here btw: there’ll be those who will value the explanation. That’s the trouble with maths - it’s sequential. If you were off that day when they ‘did’ kilograms you could well have been left behind on the subject. 

And yes, the supermarkets are exploiting the misunderstanding of the average customer. 

juGGaKNot

Doesn't matter.
If the price is per 100g you add another 0 ( 30p/100g means 3 pounds/per kg )
If the price is per 10g you add another 2 zeros. ( 30p/10g means 30 pounds/per kg )
At least in the uk you have price/weight under everything. In romania you do the math.

KxMx

For me it is a simple equation to get the equivalent price per kg, but I totally say it should be one or the other for transparency and simplicities sake. 

Bacman

Most people don't understand or choose to ignore what figures actually are, which is why retailers have for years now priced things at £9.99 instead of £10, not because it is a penny difference but because most people read the first bit and not the second, so they see £9.99 as £9 not £10.  That is the same for weight comparisons too, if people look in the above example as 8p per 100g compared to 70p per kilo; they read it as "8p per who-cares" vs "70p per who-cares" so think the 8p is a bargain.

It's only right shops will take advantage of those people, after all they are in business to make money. Those of us who compare cost will know the difference; same as we know for example the massive extra cost to buy the same food ungrated, uncooked or unsliced compared to the versions that do!

maman

juGGaKNot said:

Doesn't matter.
If the price is per 100g you add another 0 ( 30p/100g means 3 pounds/per kg )
If the price is per 10g you add another 2 zeros. ( 30p/10g means 30 pounds/per kg )
At least in the uk you have price/weight under everything. In romania you do the math.

You've obviously never taught maths! 🤣
I cringe at 'adding noughts' which effectively does nothing although I suppose (being even more pedantic) it depends where you add them and whether you have a decimal point . 😉

I think it's all done to try to fool the customer. I've always assumed that prices per 100g are because the price per kg is eye wateringly expensive. As in the price of fish! 

Pollycat

KxMx said:

For me it is a simple equation to get the equivalent price per kg, but I totally say it should be one or the other for transparency and simplicities sake. 

+1 to this ^^^^

And this:

maman said:

I think it's all done to try to fool the customer. I've always assumed that prices per 100g are because the price per kg is eye wateringly expensive. As in the price of fish! 

I find it easy to work out but not everyone is the same.

I was looking at 3 sizes of wash liquid, 2 had offers, 1 didn't.

A chap was stood next to me (pre-covid).

I picked one up and remarked 'no brainer'.

He asked why I'd chosen that one, he really didn't know which one worked out the cheapest.

tarzanette

Has anyone else noticed that the price per 100g for the KTC tomatoes is wrong?

Mickey666

It’s correct to one significant figure.