Unit price
The big pack is not always cheapest. Enter the price and amount for each offer, and the tool works out the price per unit.
The explanation is shown. Quick: three offers. Advanced: up to six offers, percentage discount and what the difference means when you buy a lot.
Your numbers
More options: Offers 4-6
Leave price or quantity at 0 for an offer you don't use. The prices are your own.
Answer
Cheapest: DIY store B
24.90DKK / kg
| # | Offer | Per unit | More expensive than cheapest |
|---|---|---|---|
| 1 | DIY store Bcheapest | 24.90 DKK / kg | — |
| 2 | Timber merchant C3 / 2 | 32.67 DKK / kg | +31.2 % (+7.77) |
| 3 | DIY store A | 44.50 DKK / kg | +78.7 % (+19.60) |
How to work it out
- 1DIY store B: 249 / 10 kg = 24.90 DKK / kg
- 2Timber merchant C: 2 · 49 DKK / (3 · 1 kg) = 98.00 / 3 = 32.67 DKK / kg«3 for 2»: you pay for 2 packs and get 3. That only counts if you can use all 3.
- 3DIY store A: 89 / 2 kg = 44.50 DKK / kg
- 4Cheapest: DIY store BAlways compare the price per unit — the biggest pack is not always the cheapest.
The formula
unit price = price / quantity
The biggest pack is not always the cheapest — work it out.
a for b: unit price = b · price / (a · quantity)
«3 for 2»: you pay for 2 packs and get 3.
save p %: unit price = price · (1 − p/100) / quantity
more expensive % = (price − cheapest) / cheapest · 100
In depth: more numbers and “what if”
What does it cost to buy a lot?
| Offer | 10 kg | 100 kg | 1,000 kg |
|---|---|---|---|
| DIY store B | 249.00 DKK | 2,490.00 DKK | 24,900.00 DKK |
| Timber merchant C | 326.67 DKK | 3,266.67 DKK | 32,666.67 DKK |
| DIY store A | 445.00 DKK | 4,450.00 DKK | 44,500.00 DKK |
Calculated with the unit price. In practice you buy whole packs, so it may be a little more. The difference between cheapest and most expensive is DKK 1,960.00 per 100 kg.
More: Workshop maths
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- Material consumption including wasteBoards, paint, battens at c/c spacing and packs — for a composite surface or a whole room, with waste.
- Mix ratio1 : 50, three parts, percent, dilution and the cross rule — how much of each.
- Density and weightThe weight of plates, bars and pipes — per piece, per running metre and in total.