Free Marketplace Fee Cost calculator with clear step-by-step results.
Aggregates every marketplace charge into one effective rate against gross merchandise value. Fixed subscription and per-order fees do not scale with revenue, which means the effective rate falls as volume grows - and is why low-volume sellers pay a much higher real percentage than the headline commission.
Total fees
Fees = GMV x (commission + processing) + subscription + orders x per-order fee
Effective rate
Rate % = total fees / GMV x 100
Because processing, subscription and per-order fees are added on top. A 12% commission commonly becomes a 16-18% effective rate at modest volume.
Only above the volume where the reduced commission saves more than the subscription costs. Model both plans here and compare the effective rates.