Invoices and numbers,
right in your browser.
Write an invoice or a quote and download it as a PDF, and work out loans, savings, percentages, discounts, margins and tax. Free, private, no sign-up.
Invoice & Quote Generator
Line items, discount, tax, your logo and payment details, downloaded as a PDF.
Open the generator →Loan & Mortgage Calculator
The monthly payment, the total interest and a year by year schedule.
Open the loan calculator →Savings Calculator
What a starting amount and regular deposits grow into, with compound interest.
Open the savings calculator →Percentage Calculator
Percent of a number, what share it is, the change between two numbers.
Open the percentage calculator →Discount Calculator
The sale price, the saving, or the percentage off two prices.
Open the discount calculator →Margin & Markup Calculator
Profit, margin and markup from a cost and a price, or the price for a target margin.
Open the margin calculator →VAT & Sales Tax Calculator
Add a rate to an amount or take it back out, with the tax shown separately.
Open the VAT calculator →How it works
Every tool on this site runs entirely inside your browser. Your client details, prices and figures are never uploaded: the invoice draft is kept in your own browser storage, the PDF is produced by your browser's print dialog, and the calculators are plain arithmetic running on your device. That is also why the tools can stay completely free.
The calculators contain no country tax rules. Rates are the ones you type, so nothing here can quietly go out of date. FinKit gives no tax, legal or financial advice.
Frequently asked questions
Are these tools really free?
Yes. Every tool on FinKit is completely free with no sign-up, no watermark on the invoice and no limits. The site is supported by ads.
Is my invoice data uploaded anywhere?
No. The invoice you write stays in this browser: the draft is kept in your browser's local storage, the PDF is made by your browser's own print dialog, and you can save the draft as a JSON file on your device. Nothing is sent to a server.
Does FinKit know my country's tax rates?
No, and that is deliberate. Tax rules change every year, so the tools only use the rate you type. Country tax tables (salary, income tax, VAT rates per country) may come later, dated and sourced, but they are not part of the site today.
Is this tax or financial advice?
No. The calculators are arithmetic and the invoice generator is a document editor. Both are there to save you time, not to replace an accountant or a tax adviser.
Which currencies are supported?
Forty-four, from EUR and USD to INR, BRL and ZAR, formatted the way your language writes them. The currency you pick is remembered for the next visit.