Bulk-buy break-even calculator
A bulk pack is only cheaper if enough of it is actually used.
%
Bulk price per unit used
0.007 41
- Normal price per unit
- 0.010 00
- Saving over the usable bulk quantity
- 7.00
- Quantity needed to justify bulk price
- 2000.0
Show the working
- Normal-pack price = 5
- Normal-pack quantity = 500
- Bulk-pack price = 20
- Bulk-pack quantity = 3000
- Expected bulk waste = 10
- Normal price per unit = 5/500 = 0.01
- usable_bulk = 3000*(1-10/100) = 2700
- Bulk price per unit used = 20/2700 = 0.007 407 41
- Saving over the usable bulk quantity = (0.01-0.007 407 41)*2700 = 7
- Quantity needed to justify bulk price = 20/0.01 = 2000
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- bulk unit price = bulk price / (bulk quantity x usable share)
Storage cost, expiry and tied-up cash are not included.