Normalise each package
Package quantities convert within one dimension: kg, oz and g to grams; L, US fl oz and ml to millilitres. Mass never converts to volume.
Product Price-Rise Impact Calculator
See what a supplier price rise or smaller package does to product cost per service—and across a working year.
Free, browser-local and available without registration. It compares direct product cost only and does not change your service price automatically.
Interactive calculation requires JavaScript. The methodology, fictional example, assumptions, limitations and FAQ remain available without it.
Enable JavaScript to use the interactive calculator.
Values are not written to localStorage, sessionStorage, IndexedDB, cookies or this page’s URL, and no calculator action sends them to analytics. Reloading or navigating away clears them. The route may receive only the existing stripped, path-only page view after central integration approval.
How the price-rise calculation works
Every authoritative money and percentage calculation uses decimal-safe arithmetic rather than binary floating-point.
Compare exact unit costs
Unit cost equals package price divided by normalised package quantity. Percentage change uses the old unit cost as its required non-zero base.
Project service impact
Old and new product cost per service are rounded half-up to cents. Their displayed difference is projected across the entered services and working periods.
Unit cost: package price ÷ normalised package quantity
Per-service cost: exact unit cost × normalised quantity used
Annual impact: rounded per-service change × annual service count
Average monthly impact: annual impact ÷ 12
Unit costs display to four decimal places. If old and new unit costs round to the same four-decimal value, the result is classified as no material displayed change. Exact values still remain in the pure calculation result.
Fictional salon example
A colour cream rises from A$20.00 for 100 g to A$24.50 for 90 g. A service uses 30 g, eight times a week for 48 weeks.
- Old unit cost
- A$0.2000/g
- New unit cost
- A$0.2722/g
- Classification
- Combined price increase and package reduction
- Old cost per service
- A$6.00
- New cost per service
- A$8.17
- Annual impact
- A$833.28 increase
Use Load fictional example in the calculator to inspect this scenario and both service-price review modes.
What each change label means
- Price increase only: package price rose while normalised quantity stayed equal.
- Package reduction only: price stayed equal while normalised quantity fell.
- Combined increase: price rose and normalised quantity fell.
- Offsetting change: price and quantity moved in competing directions, but unit cost still increased.
- Unit-cost decrease: the new exact unit cost is lower.
- No material displayed change: old and new unit costs match at four displayed decimal places.
Assumptions and limitations
- Prices use the selected currency as a display and calculation label. There is no currency conversion.
- Monthly impact is the annual scenario divided by 12, even when fewer than 12 working months are entered.
- Usage is an average scenario; it does not predict waste, dispensing variation or supplier availability.
- Service-price review modes preserve one old direct-product-cost percentage only. They do not calculate profit or a complete, guaranteed commercially sustainable price.
- Any other direct product cost entered for a service-price review is a per-service amount held constant between the old and new scenarios.
- Labour, overhead, tax, fees, timing, demand and other business costs remain excluded.
Frequently asked questions
What counts as shrinkflation?
A package reduction means the current package contains less product after compatible units are normalised. The calculator separates a package reduction from a price-only increase and a combined increase.
Does a higher package price always mean a higher unit cost?
No. A larger package can partly or fully offset a higher sticker price. The calculator compares normalised unit costs before classifying the change.
Is the service-price review a recommended price?
No. It is a bounded percentage-preservation scenario based only on the direct product costs entered. It does not include labour, overhead, tax, fees, waste, timing, demand or every commercial factor.
Does TintLedger save what I enter here?
No. Calculator values remain in this mounted browser component and clear when you reload or leave. Copy, print and CSV happen only when you choose them.
Your product prices will change again
Store them in TintLedger and keep future formula costs current.
Calculator values are not transferred or saved by this page. Open Backbar to review or add the product separately.
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