Free Invoice & Finance Calculators

Ten free tools for small business — invoice deadlines, working days, tax and pricing. Pick one below: no signup, nothing leaves your browser.

Every calculator you need to get paid on time

Ten free tools for invoices, deadlines and pricing. Pick one — no signup, nothing leaves your browser.

Invoice Due Date Calculator

Net 30/60/90, EOM and custom terms — calendar or business days.

Business Days Calculator

Add working days to a date or count them between two dates.

Days Between Dates

Total days, weeks breakdown and business days side by side.

Invoice Generator

Line items, tax and totals — print or save a clean PDF invoice.

VAT Calculator

Add or remove UK VAT at 20%, 5% or any custom rate.

Sales Tax Calculator

US state base rates and custom combined rates, add or remove.

Profit Margin Calculator

Profit per unit, margin % and markup % from cost and price.

Markup Calculator

Selling price from cost and markup — and the margin it hides.

Discount Calculator

Percent off and stacked coupons, with the honest combined rate.

Bulk Due Dates for Excel

Paste an invoice list, get every due date, export back to CSV.

Why TermCalc

Free forever — every tool works without an account, a paywall or a watermark.
Private by design — everything runs in your browser; no invoice data or numbers are ever uploaded.
Built for small business — payment terms, working days, VAT and sales tax, margins and markups: the maths you actually do every week, in one place.

Start with the most popular tool: the invoice due date calculator — tell it the invoice date and terms, get a calendar answer in seconds. Sending the invoice next? The invoice generator prints a clean PDF in one click.

Have a suggestion?

Missing a feature or found something off? Tell us — user suggestions decide what we build next.