Estimate a transparent late fee based on the overdue amount, rate, and delay.
Estimated late fee
Based on the values entered · USD
Exchange rates come from Frankfurter public market data and are estimates. Latest published date: 2026-06-23.
How to use it
Calculate a proportional late fee that you can explain clearly to a client.
Use realistic values from your own work and records.
Read the supporting breakdown, not only the headline.
Test a conservative and an optimistic scenario.
Methodology
The tool uses simple daily interest: invoice amount multiplied by the annual rate, divided by 365, then multiplied by days overdue.
Practical example
A 3,000 invoice at 8% annual simple interest for 30 days produces an estimated fee of about 19.73.
Formula
Only use fees permitted by your agreement and applicable law.
Common mistakes
Better inputs
Learn the context
Learn what a freelance invoice should include, how to structure payment terms, and how to make invoices clear, professional, and easier to pay.
Price fixed freelance projects with a clear method for scope, hours, complexity, revisions, expenses, risk, and margin.
Common questions
Yes. It is free to use, requires no account, and your entries stay in your browser.
The result is a planning estimate based on the values you provide. Taxes, local rules, and individual circumstances can change the real outcome.
No. This calculator runs in your browser and does not send your entries to a server.
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