Before/After Price Change Calculator
Compare monthly revenue and profit before and after a price change — including the volume you'd need at the new price to break even.
- Free calculator
- Instant estimate
- No signup needed
- Beginner friendly
Enter every amount in the same currency. This selector only changes the symbol shown — it does not convert exchange rates.
Before
After
Profit change
$56.00
Monthly
Revenue change
−$30.00
$3,000.00 → $2,970.00
Old monthly profit
$1,870.00
$18.70/unit × 100
New monthly profit
$1,926.00
$21.40/unit × 90
Sales needed at new price to tie
88
Short example
Old: $30.00 × 100 sales, profit/unit ~$18.70 = ~$1,870.00. New: $33.00 × 90 sales, profit/unit ~$21.40 = ~$1,926.00. Even with fewer sales, profit rises ~$56.00.
All calculations are estimates based on average platform fees. Real profits may vary depending on category, ads, and shipping.
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How to use this calculator
- Enter your numbers in each field above — the calculator updates instantly as you type, so there's nothing to submit.
- Use your real figures when you have them, or sensible estimates while you're planning. If a field doesn't apply, leave it at zero.
- Compare the results, then change one input at a time to see how each lever (price, cost, fees, volume) moves the outcome.
Formula
Old/unit = Old − Cost − (Old × Fee% + Fixed) · New/unit = New − Cost − (New × Fee% + Fixed) · Old monthly = Old/unit × Old sales · New monthly = New/unit × New sales · Sales to tie = Old monthly ÷ New/unit
Worked example
$30 × 100 sales → $33 × 90 sales, $8 cost, 10% + $0.30 fee.
- Old/unit = $18.70
- New/unit = $21.40
- Old monthly = $1,870
- New monthly = $1,926
- Sales to tie at new price = 88
Answer: +$56 monthly profit; you need only 88 sales at $33 to match
How it works
Volume rarely stays flat after a price change. Modeling a realistic drop is the honest way to test whether a bump is worth it — sometimes 10% fewer sales at 10% more price beats the status quo.
How to interpret your results
- Dollar values are shown per sale, per order, or per item unless a result is explicitly labelled monthly, weekly, or daily.
- Percentages (margin, ROI, conversion rate) are easier to compare across products and price points than raw dollars — use them when you benchmark.
- A positive result means you're ahead after the costs and fees you entered. A negative result means the current numbers don't work — change a lever (raise price, cut a cost, lower ad spend) and recalculate.
- Treat the output as a planning estimate, not a guarantee. Fees, taxes, and conversion rates shift over time — re-run the numbers whenever a key input changes.
Common mistakes
- Assuming volume stays flat.
- Using best-case new sales instead of a realistic estimate.
- Skipping the break-even sales number — that's the anchor for the decision.
Related Guides
Go deeper with plain-English guides on the same topic.
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FAQ
- How much volume drop should I assume?
- For non-commodity products, model 5–15% for a 10% price increase. Higher-elasticity categories need more.
- How is this different from Price Increase Calculator?
- Price Increase assumes stable volume. This one lets you change both price and monthly sales.
Why trust this calculator?
This tool uses standard mathematical formulas and commonly accepted calculation methods, shown openly in the Formula section above so you can verify the math yourself. Results are estimates based on the information you enter and do not account for every individual circumstance. For important financial, tax, legal, medical, or business decisions, please double-check with a qualified professional before acting on the numbers.
Keep going
One calculator rarely tells the full story. Pair this one with a related tool below to pressure-test your numbers from a different angle, or browse Selling & Business Calculators for more in the same category.
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