Supplier price change calculator
Turn two invoice unit costs into one percent change you can share before the vendor call.
Calculator
Supplier price change calculator
Live result
—Enter values to see results update live.
Why this matters
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One number for the conversation
Percent change is easier to negotiate with than a gut feel about "it went up a bit."
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Invoice-grounded
Pull costs straight from line items — not list prices or memory.
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First step in the loop
Seeing the move clearly makes every later margin decision faster.
Quick answers
How do I calculate supplier price change?
Percent change is (new cost minus old cost) divided by old cost, times 100. Use the same unit on both invoices.
When should I escalate to the supplier?
Escalate when the same SKU moves more than your alert threshold or breaks a quoted unit price.
What if the pack size changed?
Normalize to cost per unit first, then compare. Use the unit cost normalizer next in the journey.
Sources & citations
Formulas follow standard cost-accounting definitions. CostBeacon defaults are documented in product help and technical guides.
Formula reference
((new − old) ÷ old) × 100
CostBeacon
Turn invoices into cost history
Upload supplier PDFs and get line-item unit costs, price alerts, and margin insights — without spreadsheets.