Free Tools

15 free Invoicekin tools: rate, late fee, tax, due-date and margin calculators, plus estimate, receipt, purchase order, proforma and credit note makers.

Freelance Rate Calculator — Work backwards from your target salary to the hourly rate you must charge.
Late Fee Calculator — Calculate a fair late fee on an overdue invoice by amount, rate and days late.
Discount Calculator — Find the discounted price and your saving in seconds.
Sales Tax / VAT Calculator — Add or remove sales tax / VAT from any amount.
Due Date Calculator — An invoice due date calculator: Net 15 / 30 / 60 due dates from any invoice date, instantly.
Hourly-to-Salary Converter — Convert an hourly rate to weekly, monthly and yearly pay — and back.
Overtime Pay Calculator — Regular + overtime pay at 1.5× or 2×, calculated exactly.
Profit Margin Calculator — Margin and markup from cost and selling price.
Invoice Number Generator — Generate clean, sequential invoice numbers with your prefix.
Estimate Generator — Quote first, convert to an invoice in one click. Estimates cost 1 tool credit — they never count against your invoice allowance.
Receipt Generator — A clean payment receipt with your logo, business profile and signature.
Purchase Order Generator — Professional purchase orders for ordering goods and services.
Proforma Invoice Generator — Create a proforma invoice for advance payments, deposits and customs.
Credit Note Generator — Correct a billed amount with a proper credit note.
Timesheet-to-Invoice — Log hours in the editor and turn them into an invoice in one click.