CNC Machining Cost Calculator — Estimate Per-Part Machining Cost
Estimate CNC machining cost per part from material, machine rate, cycle time, setup time, and batch quantity — get per-part and total batch cost instantly.
Calculator
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Machining cost per part: ₹120.00
Setup cost per part: ₹13.50
Cost per part: ₹300.72
Total batch cost (50 pcs): ₹15036.00
Formula
Cost per Part = Material Cost per Part + (Cycle Time [hrs] × Machine Hourly Rate) + (Setup Time [hrs] × Machine Hourly Rate ÷ Batch Quantity) + Finishing/Tooling Cost per Part, marked up by Overhead %. Total Batch Cost = Cost per Part × Batch Quantity.
Example calculation
A part needs ₹120 of material, 8 minutes of cycle time on a machine billed at ₹900/hr, a 45-minute one-time setup, a batch of 50 pieces, ₹15 finishing cost, and 12% overhead: Machining = (8÷60)×900 = ₹120. Setup per part = (45÷60×900)÷50 = ₹13.5. Base cost = 120+120+13.5+15 = ₹268.5. With 12% overhead: ₹300.72 per part → ₹15,036 for the batch of 50.
Engineering notes
Setup cost is the single biggest lever on per-part price for small batches — spreading a fixed setup cost over more pieces drives the per-part cost down sharply, which is why job shops quote a lower unit price for larger quantities. Always confirm whether a vendor quote already includes tooling wear, programming time, and inspection, or bills them separately — comparing two quotes side-by-side is only valid once you know what is bundled into each. Machine hourly rate should reflect the fully-loaded shop rate (machine depreciation, power, floor space, operator), not a bare labour rate, or true cost will be understated by a wide margin. This estimate is directional; a shop quote also factors in tolerance, surface finish, tool wear on hard materials, and scrap allowance.
When to use this calculator
- Budgeting a machined-part cost before issuing an RFQ to CNC job shops
- Sanity-checking a vendor quote by rebuilding the cost bottom-up
- Comparing in-house machining cost against an outsourcing quote (make-or-buy)
- Estimating how cost per part changes with batch size before committing to a production run
Frequently asked questions
- How do you calculate CNC machining cost per part?
- Cost per Part = Material Cost + (Cycle Time in hours × Machine Hourly Rate) + (Setup Time in hours × Machine Hourly Rate ÷ Batch Quantity) + Finishing/Tooling Cost. Multiply by (1 + overhead %) to include shop overhead and margin. The setup-cost term shrinks as batch quantity increases, which is why larger orders get a lower per-part price.
- What is included in CNC machining cost?
- Four main components: (1) raw material cost for the part plus scrap/kerf allowance, (2) machining time × the shop's hourly machine rate (which itself bundles depreciation, power, floor space, and operator labour), (3) one-time setup and programming cost amortised across the batch, and (4) finishing operations — deburring, anodizing, plating, or inspection — priced per part.
- Why does CNC machining cost per part drop for larger batch sizes?
- Setup and programming are one-time costs regardless of batch size. Spread across more parts, the setup cost per part falls proportionally — e.g. a ₹5,000 setup is ₹500/part at qty 10 but only ₹50/part at qty 100. Material and machining-time costs stay roughly constant per part, so batch size mainly affects the setup-cost share of the total.
- What is a typical CNC machine hourly rate in India?
- Shop rates vary widely by machine class and region — roughly ₹500–900/hr for a 3-axis VMC on general steel/aluminium work, and ₹1,200–2,500/hr for 5-axis or high-precision work. Always ask a vendor whether their quoted rate is machine-only or fully-loaded (includes operator, tooling amortisation, and overhead) before comparing quotes.
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