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Free discount impact calculator and discount profit calculator. See margin before and after, profit impact, and break-even volume increase %. Use with the discount percentage calculator and product margin calculator.
Last updated: May 24, 2026
Planning list price first? Product margin calculator
Regular selling price before discount
Percentage off the original price (0-100%)
Your cost to produce or acquire one unit
Number of units you expect to sell
Original Price
$100.00
Discounted Price
$80.00
Profit Margin Impact
Before
50%
Drop
-12.5%
After
37.5%
Volume Increase Needed
+66.7%
To maintain current profit levels
Profit Before
$5,000
Profit After
$3,000
Total Profit Impact
$-2,000
Risk Level: Low
Low risk: 37.5% margin retained — 67% volume increase offsets profit gap.
Discount Strategy Tips:
Answers: what margin you keep after a discount, how much profit you lose at the same volume, and how many extra units you must sell to break even.
$100 → $80 sale · margin 50% → 37.5% (−12.5 pts).
$50 → $30/unit · -$2,000 total on 100 units.
67 extra units · 167 total units to match $5,000 profit.
Default: $100 price · 20% off · $50 COGS · 100 units (same volume comparison).
Margin drop
−12.5 pts
Volume needed
+66.7%
New margin
37.5%
Profit impact
-$2,000
Sale $80 · revenue -$2,000 at same volume · Low risk.
| Metric | Formula | Default example |
|---|---|---|
| Sale price | Price × (1 − Discount %) | $100 × 0.80 = $80 |
| Margin before | (Price − COGS) ÷ Price × 100 | ($100 − $50) ÷ $100 = 50% |
| Margin after | (Sale − COGS) ÷ Sale × 100 | ($80 − $50) ÷ $80 = 37.5% |
| Profit impact (same volume) | (Profit after − Profit before) × Units | ($30 − $50) × 100 = −$2,000 |
| Break-even volume +% | (Profit before ÷ Profit after − 1) × 100 | ($50 ÷ $30 − 1) × 100 = +67% |
| Break-even units | Baseline + Extra units needed | 100 + 67 ≈ 167 units |
| Band | Margin after | Typical volume lift | Example |
|---|---|---|---|
| Critical | Below 0% | N/A — losing on each sale | 50% off with $60 COGS on $100 item |
| High | 0 – 19% | Often 100%+ | Grocery $10 item, 15% off, $8 COGS |
| Moderate | 20 – 29% | 40 – 100% | 30% flash sale on 50% margin item |
| Low | 30 – 39% | 20 – 70% | Default 20% off → +67% |
| Very Low | 40%+ | < 25% | 10% off on 60% margin product |
Sale = Price × (1 − Discount ÷ 100)Break-even volume % = (Profit before ÷ Profit after − 1) × 100Margin after
37.5%
Volume +%
+66.7%
Profit impact
-$2,000
Risk
Low
$80 sale · 50%→37.5% margin · −$2K profit · +67% volume (167 units) · Low risk.
Margin after
86.7%
Volume +%
+38.5%
Profit impact
-$12,500
Risk
Very Low
90%→86.7% margin · −$12.5K at same volume · only +38% volume to break even · Very Low risk.
Margin after
5.9%
Volume +%
+300%
Profit impact
-$750
Risk
Very High
20%→5.9% margin · −$750 profit · +300% volume needed · High risk.
Margin after
28.6%
Volume +%
+150%
Profit impact
-$9,000
Risk
Moderate
$105 sale · 50%→28.6% margin · −$9K profit · +150% volume (500 units) · Moderate risk.
Margin after
-20%
Volume +%
+0%
Profit impact
-$5,000
Risk
Critical
$50 sale · negative margin · −$5K profit · do not run.
Margin after
55.6%
Volume +%
+20%
Profit impact
-$1,000
Risk
Very Low
60%→55.6% margin · −$1K profit · only +20% volume · Very Low risk.
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