Gumroad Fee Calculator accuracy and testing

Formula source

• Gross sales = price x units. Net revenue = gross sales x (1 - refund rate) - platform fee - processing fee - fixed fees - product costs.

Test cases

Known limitations

• These calculators are planning tools. They do not fetch current platform pricing, read private dashboards, model taxes, guarantee sponsor demand, or replace legal, tax, accounting, or contract review.

Assumptions

• All fees, rates, commissions, CPMs, conversion rates, refund rates, and costs are user-entered assumptions.
• No current Gumroad, Lemon Squeezy, Patreon, podcast advertising, or brand deal pricing is hardcoded.
• Platform and deal estimates depend on the assumptions entered and should be checked against your current agreement, dashboard, or invoice.
• Calculations are deterministic and run locally in the browser without storing private creator revenue data.

Unit handling

• Product Price accepts values in $.
• Units Sold accepts numeric values.
• Platform Fee accepts values in %.
• Payment Processing Fee accepts values in %.
• Fixed Fee per Sale accepts values in $.
• Refund Rate accepts values in %.
• Cost per Sale accepts values in $.
• Estimated Net Revenue is displayed as currency.
• Gross Sales is displayed as currency.
• Total Deductions is displayed as currency.
• Effective Take Rate is displayed as a percentage.

Rounding rules

• Number displays use up to 2 decimal places in the calculator UI.
• Currency outputs are displayed with standard US dollar formatting.
• Percent outputs are displayed with two decimal places.
• Input precision follows configured step values where provided.

Version history

Change log