Machining cost calculator
Setup amortises over the batch, which is why a run of one costs so much more per piece than a run of a hundred.
minutes
per hour
minutes
%
Cost per part
26.55
- Batch cost
- 1327.32
- Machine time per part
- 15.00
- Setup amortised per part
- 2.250
- Total machine hours
- 11.50
- Cost per part at a batch of 1000
- 24.34
Show the working
- Cycle time per part = 12
- Shop rate = 75
- Setup time = 90
- Batch quantity = 50
- Material cost per part = 8.5
- Scrap rate = 3
- Machine time per part = 12 / 60 * 75 = 15
- Setup amortised per part = 90 / 60 * 75 / 50 = 2.25
- subtotal = 15 + 2.25 + 8.5 = 25.75
- Cost per part = 25.75 / (1 - 3/100) = 26.5464
- Batch cost = 26.5464 * 50 = 1327.32
- Total machine hours = (90 + 12 * 50) / 60 = 11.5
- Cost per part at a batch of 1000 = (15 + 90/60*75/1000 + 8.5) / (1 - 3/100) = 24.3428
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
- cost = (cycle x rate + setup x rate / quantity + material) / (1 - scrap rate)