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Marketplace Commission Calculator
Isolate the commission bite: per-unit and monthly commission at any rate plus fixed per-unit fees, with effective rate and net-per-unit context.
Commission Inputs
Selling Price ($)
Commission Rate (%)
Fixed Fee per Unit ($)
Units per Month
Commission Breakdown
Commission / Unit$13.00
Monthly Commission (300 units)$3900.00
Effective Rate16.25%
Net / Unit Before Costs$67.00
Commission verdict: Commission takes $13.00/unit (16.3% effective) — $3900.00/month at volume, leaving $67.00 per unit before product costs. Price every listing off net-per-unit, never gross price.
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Frequently Asked Questions
How is marketplace commission calculated?
Commission = Price x Commission Rate + Fixed Fee per Unit. At $80, 15%, plus $1 fixed, commission is $13 per unit.
What is the effective commission rate?
Total per-unit commission divided by price. Fixed fees push effective rates higher on cheap items — a $1 fee on $10 is 10 extra points.
Which categories charge the highest commission?
Jewelry (20%), apparel (17%), and consumer electronics accessories (15%) run highest on Amazon; media and grocery run lowest. Check your exact category table yearly.
Do commissions apply to shipping charged?
Often yes — eBay and Etsy assess fees on item + shipping totals. Build shipping into the commission base or shipping-heavy listings underprice fees.
How do I lower effective commission?
Shift cheap SKUs to bundles (fixed fees spread thinner), choose lower-fee categories where honest, and move repeat buyers to owned channels.