Price change & discount impact calculator

A discount always costs more than the percentage on the sign, because it comes entirely out of margin, not revenue. This shows exactly how much more volume it needs, or how much volume loss a price increase can absorb.

The sign of the result matters more than the number. A negative price change (a discount) produces a positive required volume increase. You need more sales to make up the lost margin. A positive price change (an increase) produces a negative figure, that's how much volume you could lose and still come out even.

A 10% discount doesn't cost 10% of profit, it costs 10% of price, which is a much bigger bite out of contribution margin than the percentage suggests, especially on a product that already runs a thin margin. On a 30% margin product, a 10% discount removes roughly a third of the margin dollar-for-dollar, which is exactly why the required volume increase to break even is so much larger than the discount percentage itself.

A discount that looks like "10% off" on the price tag is often 30% or more off the actual profit.

The thinner the starting margin, the more brutal a discount's volume requirement becomes. A product with an 80% margin can absorb a 10% discount needing only a modest volume increase to break even, since most of the price is still margin. A product with a 20% margin needs a dramatically larger volume increase for the same 10% discount, the discount is eating into a much thinner slice to begin with. Run your own numbers on the contribution margin calculator first if you're not sure where your margin stands.

The pattern is consistent: necessities with few substitutes (water, basic groceries, short-run energy use) cluster close to inelastic, since customers keep buying regardless of price. Discretionary and luxury categories (restaurant meals, air travel, high-end goods) cluster well above 1, since a price increase gives customers an easy, low-cost reason to simply not buy. A calculated PED of 1.2 on a product isn't unusually high in isolation, it's only meaningful once compared against what's typical for that kind of product. For real documented cases behind these benchmarks, plus worked small-business examples across several industries, see the price elasticity examples guide.

Not every customer responds to a price change the same way, which means a blanket increase or discount applied to everyone at once is often a blunter tool than necessary. Price-sensitive, deal-seeking customers and loyal, low-price-sensitivity customers can sit in the same customer base with very different elasticity, the same 10% increase that barely registers with one segment can meaningfully drive away the other. Segmenting by usage tier, purchase history, or plan level and applying different increases (or none at all) to each group targets the change more precisely than a single across-the-board number, at the cost of more administrative complexity in pricing and billing. For a small business without the infrastructure for granular segmentation, even a simple split. Existing customers grandfathered, new customers at the new price. Captures most of the benefit with a fraction of the complexity.

A price change moves contribution margin, and contribution margin is the denominator in the break-even formula, so every price change also moves your break-even point, separately from the volume question this calculator answers. A discount that requires 30% more volume to break even on margin is also raising the actual break-even unit count for the business as a whole; run both calculations together for the full picture, or see the CVP calculator's own price-comparison example.

Frequent small changes and rare large ones produce different customer reactions even when the cumulative math is identical. A 2% increase every six months adds up to roughly the same annual change as one 4% increase , but the frequent-small-change approach trains customers to expect ongoing adjustment and rarely triggers a strong reaction, while the same total change delivered as one larger jump reads as a single, noticeable event. Subscription businesses often lean toward the frequent, small-increment approach specifically to avoid ever delivering a jump large enough to prompt customers to actively reconsider the purchase. Annual reviews with modest, predictable increases tend to retain better than infrequent larger corrections, even at an identical multi-year total.

This calculator shows the break-even volume threshold, not a prediction of what customers will actually do, that depends on price elasticity, competition, and how visible the change is, none of which this tool can know. It also assumes variable cost per unit doesn't change with volume, which can break down at a very different scale than your current sales. See the CVP page's assumptions section for more on where that holds and where it doesn't.

Run your own price change numbers above, free, or see the contribution margin and break-even point pages for the related numbers this page covers.