How do you calculate the dollar impact of a supplier quote difference?

Multiply the per-unit price gap by the affected buy quantity to get the gross impact, then multiply by comparable scope and pricing confidence. With a $2.85 gap on 4,200 units at 100% scope and 95% confidence, gross impact is $11,970 and realizable impact is $11,371.50.

Why is the realizable impact lower than the gross impact?

Gross impact assumes the full gap applies to every unit and is guaranteed. Scope below 100% removes non-comparable volume, and confidence below 100% reserves part of the savings as at-risk. In the example, $598.50 is held back as confidence risk, leaving $11,371.50.

What is a good pricing confidence percentage to use?

Use 90-95% for a firm quote with a signed price agreement and a credible lead time, 70-85% for a quote with index-linked pricing or shaky capacity, and below 70% for an unproven supplier. At 95%, you're reserving 5% of the gross gap against price slippage.

Should I compare quotes on unit price or total landed cost?

Always landed cost. This tool isolates the per-unit gap so you can layer it on top of freight, duty, tooling, and inventory carrying differences. A $2.85 unit advantage can evaporate once a higher MOQ or longer lead time is priced in.

What does the comparable scope percentage represent?

It's the share of the affected volume where both quotes cover identical specs, finish, packaging, and terms. If only 80% of the buy is truly like-for-like, set scope to 80% so the calculator doesn't credit savings on parts you can't directly compare.

Contract Manufacturing, Job Shop Quoting & Make-to-Order calculator

Supplier Quote Comparison Calculator

Supplier Quote Comparison turns a per-unit price difference between two vendors into a hard annual dollar figure, then discounts it for the parts of the quote that aren't truly comparable and the risk the price won't hold. Sourcing managers and buyers in contract manufacturing use it to defend an award decision when a 'cheaper' quote is only cheaper on paper. The headline number is the impact you can actually bank, not the gross savings the spreadsheet first shows. It keeps a quote bake-off honest by separating gross gap from realizable benefit.

What this calculator does

Compare supplier quote impact for bought-out or outside-processed work.
choosing between supplier quotes for material, components, tooling, or outside services
It computes the realizable annual dollar impact of choosing one supplier over another by weighting the per-unit price gap by buy volume, comparable scope, and pricing confidence.

Formula used

gross supplier quote impact = supplier quote cost difference per unit × affected buy quantity
comparable supplier quote impact = gross supplier quote impact × comparable supplier quote scope × supplier quote confidence

Inputs explained

Per-unit price gap between supplier quotes:
Annual buy quantity affected by the switch:
Share of volume on a true like-for-like quote:
Confidence the quoted price will hold:

How to use the result

Use it during a quote bake-off or resourcing decision when two vendors are within a few dollars per unit and you need to know whether the gap is material after risk.
It assumes the per-unit gap is apples-to-apples on everything you didn't already strip out via the scope and confidence factors; freight, tooling amortization, and MOQ break points still need a separate landed-cost check.

Current U.S. benchmarks

The U.S. prime lending rate is 6.75% (Federal Reserve via FRED, 2026-07-02). Payback and financing math should start from today's rate, not a remembered one.

Common questions

How do you calculate the dollar impact of a supplier quote difference? Multiply the per-unit price gap by the affected buy quantity to get the gross impact, then multiply by comparable scope and pricing confidence. With a $2.85 gap on 4,200 units at 100% scope and 95% confidence, gross impact is $11,970 and realizable impact is $11,371.50.
Why is the realizable impact lower than the gross impact? Gross impact assumes the full gap applies to every unit and is guaranteed. Scope below 100% removes non-comparable volume, and confidence below 100% reserves part of the savings as at-risk. In the example, $598.50 is held back as confidence risk, leaving $11,371.50.
What is a good pricing confidence percentage to use? Use 90-95% for a firm quote with a signed price agreement and a credible lead time, 70-85% for a quote with index-linked pricing or shaky capacity, and below 70% for an unproven supplier. At 95%, you're reserving 5% of the gross gap against price slippage.
Should I compare quotes on unit price or total landed cost? Always landed cost. This tool isolates the per-unit gap so you can layer it on top of freight, duty, tooling, and inventory carrying differences. A $2.85 unit advantage can evaporate once a higher MOQ or longer lead time is priced in.
What does the comparable scope percentage represent? It's the share of the affected volume where both quotes cover identical specs, finish, packaging, and terms. If only 80% of the buy is truly like-for-like, set scope to 80% so the calculator doesn't credit savings on parts you can't directly compare.

Last reviewed 2026-05-12.