Discount Impact Calculator
Calculate how a % discount or € coupon changes contribution — incl. before/after, delta, break-even units and a signal.
Note: results are not made indexable via URL parameters. Canonical: https://tools.snapsoft.de/en/tools/rabatt-impact
Who is this for?
- E-commerce teams planning promotions/coupons while protecting margin
- Sellers combining discounts and repricing (and needing guardrails)
- Ops/finance teams who want to quantify incremental volume assumptions cleanly
Stop guessing discounts: how much does the coupon really eat?
A discount doesn’t just lower price — it lowers contribution. Percentage fees (platform/payment) still scale with price.
This calculator shows price after discount, contribution before/after, delta, and how many extra sales you need to keep the same absolute contribution (break-even units).
Calculator
Max 6 inputs, clear outputs. Everything runs locally in your browser.
Inputs
Advanced options
Result
How it works
New price: (P_{new} = P_{list} \cdot (1 - discount\%)) or (P_{new} = P_{list} - coupon€).
Fees: (fee€ = P \cdot (platform\% + payment\%)).
Contribution: (contrib€ = P - purchase - shipping/handling - fee€).
Break-even units: (U = contrib_{before}/contrib_{after}) (only if (contrib_{after} > 0)). Signal target: contribution margin after discount ≥ 5%.
Quick conclusion
- Discounts only make sense if incremental volume exceeds break-even units.
- Set a guardrail: minimum contribution/margin (default: 5%) — otherwise coupons eat your margin.
- Next step: connect discount rules with repricing (price rails) so promos don’t silently go negative.
Sources & notes
Disclaimer: assumptions, fees and policies can vary and change. Always verify critical values in official sources (marketplace, supplier, payment provider).
FAQ
Why do discounts often hit harder than expected?
Because price drops while many cost blocks stay the same (purchase, shipping/handling) and percentage fees still scale. Net effect: contribution drops disproportionately.
Discount % vs. € coupon — what’s more dangerous?
A fixed € coupon hits low prices especially hard. A percentage discount scales with price. What matters: contribution after discount and break-even units.
What do break-even units mean?
It’s a factor: how many sales after the discount you need to keep the same absolute contribution as before. Example: 1.5× means ~50% more volume.
Net vs. gross — what should I enter?
Keep inputs consistent (don’t mix): if fees are based on gross price, use gross everywhere — or use net everywhere.
Do you store my inputs?
No. Everything runs locally in your browser.
Turn it into a repricing rule in SnapTrade
Discounts + repricing need guardrails — otherwise coupons eat your margin. If you want to make these guardrails persistent in your system: take a look at SnapTrade.