Kepie Watch / When the bigger pack quietly wins per ki…
Pricing · this week
When the bigger pack quietly wins per kilo.
Buying the 500g pack of butter beats the 225g pack by $21.60/kg.
On the butter shelf this Friday, the 500g pack at $8.29 works out cheaper per kilo than the 225g pack at $9.99. The gap is $21.60 per kilo. This is the standard pack-size trick: the headline number on a smaller pack looks friendlier, but per kilo the bigger pack wins. It only saves money if you can use the volume before it goes off. For shelf-stable staples that’s usually fine; for fresh, do the maths on what you’ll actually finish in a week. We compute every pack in the valid pool per 100g, then sort. The cheapest-per-kg pack isn’t always the biggest one — sometimes a special on a mid-size pack wins — but it isn’t always the smallest either.
How we measure this
For each staple at each supermarket, we compute per 100g for every valid pack in the pool, then compare the cheapest per-100g pack with the smallest pack by weight. When the bigger pack wins per kilo by at least $0.30, we surface the gap.
Kepie Watch · Issue ending Monday, 25 May 2026
How we measure →