Profit Leakage Calculator
Your revenue line says one thing and your bank balance says another. The gap between list-price revenue and the money you actually keep is profit leakage: discounts, refunds, payment fees, commissions, and waste, each small on its own and brutal in combination. This calculator prices all six leak categories separately and shows leakage as a percentage of revenue, so you can see exactly where the margin went.
| Leak category | Amount | Share of revenue |
|---|
Total leakage = discounts + refunds + fees + commissions + waste + other. Leakage % = total leakage divided by gross revenue, times 100. Captured revenue = gross revenue minus total leakage.
Quick Answer
Leakage % = (discounts + refunds + fees + commissions + waste + other) ÷ gross revenue × 100. On $100,000 of list-price revenue with $13,000 across the six leak categories, leakage is 13.0% and captured revenue is $87,000. With expected profit of $40,000 and actual profit of $30,000, the profit gap is $10,000, or 25.0% of expected.
Key takeaways
- Leakage is revenue you earned on paper but never collected. It is different from costs: you fix leakage with pricing and process discipline, not with sourcing.
- Price every leak separately. Discount leakage is a pricing-policy problem, waste is an operations problem, and billing errors are a process problem, and they need different fixes.
- Discounts are usually the biggest single drain. They apply to every unit sold during the promotion and they train customers to wait for the next sale.
- The profit gap and the leak total are related but not equal. The leak table explains revenue leakage; the profit gap also absorbs cost overruns and one-off expenses.
How profit leakage is measured
Think of it as a bridge from list price to pocket. Every dollar starts at full price, then on-invoice cuts take their share, then off-invoice items quietly take the rest:
$100,000
Discounts $5,000
Refunds $2,000
Fees $1,500
Commissions $3,000
Waste $1,000
Other $500
$87,000
The formulas are simple on purpose, because the hard part is naming every leak honestly:
Total leakage = discounts + refunds + fees + commissions + waste + other
Leakage % = total leakage ÷ gross revenue × 100
Captured revenue = gross revenue − total leakage
Worked example, verified against the tool
Gross revenue $100,000. Discounts $5,000 (5.0%), refunds $2,000 (2.0%), payment fees $1,500 (1.5%), commissions $3,000 (3.0%), waste $1,000 (1.0%), other $500 (0.5%). Total leakage = $13,000.00, which is 13.0% of revenue; captured revenue = $87,000.00. The tool shows exactly this, and its per-category table makes the biggest drain impossible to miss.
With expected profit $40,000 and actual profit $30,000, the profit gap is $10,000.00 (25.0% of expected). The tool prints this on one detail line: “Gross revenue $100,000.00 − total leaks $13,000.00 = $87,000.00 kept. Expected profit $40,000.00 vs actual profit $30,000.00: profit gap $10,000.00 (25.0% of expected).”
What the benchmarks say about each leak
Your own history is the honest benchmark, but these published figures show where each category usually lands:
| Leak category | Typical range | What to watch |
|---|---|---|
| Refunds and returns | ~17–20% of items sold online; 30–40% in apparel | Sizing and fit drive most apparel returns; return-rate benchmarks break it down by category |
| Payment processing fees | 2.9% + 30¢ per online transaction | Standard US pricing on Stripe’s pricing page; the fixed 30¢ bites hardest on small tickets |
| Marketplace commissions | Most categories 15%; full range 5–45% | Amazon’s referral fee schedule; misclassified listings can pay the wrong tier |
| Waste and shrinkage | Recorded inventory minus actual inventory | Theft, damage, and errors; shrinkage accounting writes it off against COGS. Retail theft and fraud pressure is still rising per NRF reporting |
| Discounts and markdowns | Varies; standing discounts hit every unit | Across-the-board cuts devalue the product and train buyers to wait; discounting in a downturn carries the same trap |
The discount trap, in one formula
Discounts deserve their own warning because they feel like growth and act like leakage. A 10% discount on a 40% margin does not cost you 10% of profit; it costs you a quarter of it. Before approving a sale, compute the extra volume you need just to break even:
Extra units needed = discount % ÷ (margin % − discount %)
The derivation is short: profit per unit falls from m to m−d (as fractions of price), so units must rise by d/(m−d) to hold total profit. At a 40% margin, a 10% discount needs 10 ÷ (40 − 10) = 33.3% more units just to stand still. Harvard Business Review’s research on pricing in downturns and whether to discount at all keeps landing on the same conclusion: discounts buy short-term sales at the price of long-term pricing power. Run the formula before every promotion, and think about whether the extra contribution margin from those units actually covers the giveaway.
What competing calculators miss
The direct competitor for this keyword takes the opposite approach: it asks you to guess your leakage percentage, then multiplies revenue by your guess and calls the result an analysis. A guessed input produces a guessed output; the tool cannot tell you which leak is the problem because it never asked. The adjacent “revenue leak” tools are mostly lead magnets for agencies: missed-call calculators, churn quizzes, and 7-step funnels that end in a sales call.
What none of them do is the unglamorous work this page does: name the six places margin actually escapes, price each one in dollars and as a share of revenue, and bridge the result to the profit you expected versus the profit you got. The expected-vs-actual check is the part owners ask about most, and none of the competing tools have it.
Leakage is not the same as costs
Cost of goods sold is what you pay to make or buy what you sell; leakage is revenue you earned on paper but never collected. Both shrink profit, but you fix them differently: COGS with sourcing and operations, leakage with pricing and process discipline. If you are comparing two periods side by side, a margin comparison shows the move in percentage points; if your gross profit rate is sliding, run this leakage check before you blame your suppliers.
One more boundary worth knowing: leakage can push you past zero into negative margins. If discounts and refunds stack higher than your markup, every sale deepens the loss instead of diluting it, and the tool’s captured-revenue line will go negative to tell you so. The Small Business Administration’s marketing and sales guidance covers the pricing-strategy side of the same problem.
Frequently asked questions
Profit leakage is the gap between what you should have kept at list price and the money that actually reaches you, lost to discounts, refunds, fees, commissions, waste, and billing errors. It is not fraud; it is usually a dozen small, accepted costs nobody totals up.
Add every leak category, divide by gross revenue at list price, and multiply by 100. In the worked example: $13,000 divided by $100,000 times 100 equals 13.0%. The calculator does this per category and in total.
No. Cost of goods sold is what you pay to make or buy what you sell; leakage is revenue you earned on paper but never collected. Both shrink profit, but you fix them differently: COGS with sourcing, leakage with pricing and process discipline.
It varies widely by industry: retailers often see 2 to 5% from discounts and returns alone, restaurants can lose 3 to 10% to waste, and marketplace sellers commonly give up 15% or more to commissions and fees. The honest benchmark is your own history: measure this quarter, then watch the trend.
Because they apply to every unit sold during the promotion and they train customers to wait for the next sale. A 10% standing discount is a 10% pay cut on all affected revenue, which is why the break-even volume formula above is worth running before every promotion.
Not exactly. The leak table explains revenue leakage; the profit gap also absorbs cost overruns and one-off expenses. If the profit gap is much bigger than the leak total, your problem is on the cost side, not the revenue side.
Then the tool skips the profit gap check and shows only the leakage results: total leakage, leakage percentage, captured revenue, and the per-category table. The two profit fields are optional by design.
Yes, if discounts, refunds, and fees stack higher than what you charged. The tool will show a leakage percentage above 100% and a negative captured revenue, which is its way of telling you that you are effectively paying customers to take the product.
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References
- Stripe. Pricing: standard online processing rates and dispute fees. Accessed October 23, 2026.
- Retail Dive. NRF finds shoplifting stabilizing as online fraud grows. Accessed October 23, 2026.
- Fishbowl. Inventory Shrinkage: Causes and Ways to Prevent It. Accessed October 23, 2026.
- Feedvisor. Amazon Fee Schedule 2026: Fees, Payment Cycle and Costs. Accessed October 23, 2026.
- Red Stag Fulfillment. What Is the Average Return Rate for a Shopify Store? 2026 Benchmarks. Accessed October 23, 2026.
- Harvard Business Review. Ditch the Discounts. Accessed October 23, 2026.
- Harvard Business Review. In a Downturn, Discounts Can Be Dangerous. Accessed October 23, 2026.
- Harvard Business Review. Pricing Strategies for the Downturn. Accessed October 23, 2026.
- Harvard Business Review. To Discount or Not to Discount?. Accessed October 23, 2026.
- U.S. Small Business Administration. Marketing and sales. Accessed October 23, 2026.