Late Fee Calculator
Interest and penalties owed on an overdue invoice.
%
Late fee owed
$89.32
on 45 days overdue
Interest
$49.32
Flat fee
$40.00
New balance
$5,089.32
Daily interest
$1.10
ShowHide the working
- 1Interest = $5,000.00 × 8% × 45/365 = $49.32
- 2+ flat fee $40.00 = $89.32
Formula
interest = amount × rate × days ÷ 365How it works
Interest and penalties on an overdue invoice, pro-rated by the number of days late.
Example
8% a year on a $5,000 invoice 45 days late is about $49.32 interest.
Late-fee limits are set by contract and local law. Check what you are actually entitled to charge.
About the Late Fee Calculator
Interest and penalties owed on an overdue invoice. It sits in the Business & Sales section of NWS Calc, a free collection of calculators that run entirely in your browser. There is no signup, no paywall and no tracking — open the page, enter your numbers, get an answer.
Frequently asked questions
- Is the Late Fee Calculator free to use?
- Yes. Every calculator on NWS Calc is completely free, with no signup, no usage limits and no ads.
- Does my data leave my device?
- No. The Late Fee Calculator runs entirely in your browser using JavaScript. Nothing you type is uploaded, logged or stored on a server.
- Can I use the Late Fee Calculator on my phone?
- Yes. The page is fully responsive and works in any modern mobile or desktop browser — there is nothing to install.
- What else is in Business & Sales?
- Margins, markup, tax, payroll, discounts and break-even analysis. You can browse the full Business & Sales category for related calculators.