Contract Manufacturing, Job Shop Quoting & Make-to-Order calculator
Re-Quote Impact Calculator
Find what a drawing revision or material price change costs on the units still to build, and the price that holds your margin. You need estimated and revised unit cost, the quoted price and the remaining quantity.
What this calculator does
- Price a cost change on the rest of an order and find the unit price that keeps your quoted margin.
Formula used
- Cost impact = (revised unit cost − estimated unit cost) × remaining quantity + one-time change cost
- Revised cost per unit = revised unit cost + one-time change cost ÷ remaining quantity
- Gross margin = (unit price − unit cost) ÷ unit price × 100
- Price to hold quoted margin = revised cost per unit × quoted unit price ÷ estimated unit cost
- Pass-through price = quoted price + revised cost per unit − estimated unit cost; price at minimum margin = revised cost per unit ÷ (1 − minimum margin)
Inputs explained
- Estimated Unit Cost: Unit cost the original quote was built on.
- Revised Unit Cost: Unit cost after the change, from the revised estimate.
- Quoted Unit Price: Price per unit on the current purchase order.
- Remaining Order Quantity: Units still to build at the new cost.
- One-Time Change Cost: Reprogramming, fixture changes, first article and obsolete stock.
- Minimum Gross Margin: Lowest gross margin your pricing policy accepts.
How to use the result
- Best suited to drawing revision on an open purchase order, material surcharge on a blanket order.
- Prices the cost only; a delivery date change from the revision needs its own agreement. Assumes the remaining quantity ships; a cancelled balance leaves part of the one-time cost unrecovered.
Current U.S. benchmarks
- The U.S. prime lending rate is 7.00% (Federal Reserve via FRED, 2026-10-02). Payback and financing math should start from today's rate, not a remembered one.
Common questions
- Should I pass the cost through or hold my margin? Holding margin is the full ask; pass-through is the least that keeps your gross profit per unit. Pass-through adds only the cost change, so the margin percentage falls. The margin-holding price scales the whole price by the cost increase.
- Should the one-time change cost go into the unit price? Only if you cannot bill it as a separate charge. Spread over few remaining units, it raises the unit price sharply.
- Can I claim a price change for a customer drawing revision? Check your contract's changes clause first. The US federal fixed-price clause, 52.243-1, requires an equitable adjustment in price, schedule or both when a drawing change raises or lowers cost. Commercial purchase orders vary.
- What if the revision lowers my cost? The cost impact goes negative and holding the price raises your margin. Check your contract before keeping the saving: the federal changes clause adjusts the price for decreases as well as increases.
Related guides
Last reviewed 2026-10-01.