Free economics tool

Marketplace fee calculator with user-entered rates

Model marketplace, payment, and fixed fees using rates you enter—without assuming a specific platform or fee schedule.

Runs locallyFree to useNo account
Browser-local tool
On-device · no uploads

Inputs

Enter your inputs

Enter non-negative values unless a field says otherwise. All fields are required.

Your result will appear here

Complete the inputs and run the tool. Nothing leaves this device.

About this tool

Make the result useful—not just precise-looking

See how marketplace deductions affect net proceeds and profit. Because fee schedules vary by platform, category, country, tax treatment, and program, this tool deliberately uses only your rates.

How to use it

  1. Enter the item price and costs.
  2. Copy the applicable marketplace, payment, and fixed rates from your current agreement.
  3. Calculate and compare total fees, proceeds, and profit.

Useful for

  • Evaluating a new sales channel
  • Checking a settlement estimate
  • Comparing fee-rate scenarios

Assumptions

  • Both percentage rates apply to the entered item price.
  • Fixed fees apply once per item or order represented.
  • All values use one currency.

Limitations

  • The tool does not know category tiers, minimum fees, taxes, refunds, or fulfillment tables.
  • It does not verify that an entered rate matches any marketplace.

Common questions

Frequently asked questions

Why are rates user-entered?

Marketplace schedules change and often depend on category and seller status. User-entered rates avoid presenting an outdated platform-specific estimate as fact.

Can I include fulfillment fees?

Yes. Add per-order fulfillment or shipping to its cost field and platform fixed charges to fixed fees.

Are percentage fees compounded?

No. Each entered percentage is independently applied to the item price, then the results are added.