Free Invoicing Tools
Practical tools that do one thing well — no sign-up, no credit card. Use them on their own, or move into the invoice generator when you're ready.
Invoice Number Generator
Generate a sequence of invoice numbers with any prefix.
Open tool ›Late Payment Calculator
Work out interest and fees for overdue invoices.
Open tool ›Invoice Tax Calculator
Add tax to an invoice subtotal in seconds.
Open tool ›Hourly Rate Calculator
Turn your income target into a billable hourly rate.
Open tool ›Profit Margin Calculator
See how much of each sale is actual profit.
Open tool ›Markup Calculator
Price your products and services from cost.
Open tool ›VAT Calculator
Add or remove VAT from any amount.
Open tool ›Invoice Due Date Calculator
Work out exactly when payment is due.
Open tool ›Invoice Template Generator
Start from a real, editable invoice template.
Open tool ›Prefer the real thing?
Every tool above feeds into a professional, downloadable invoice.
Open the invoice generatorWhat these tools are for
Each tool on this page handles a single small job in the invoicing process, so you don't have to open a spreadsheet or remember a formula. Use the Invoice Number Generator to keep your numbering consistent, the Invoice Due Date Calculator and Late Payment Calculator when you need to know when money is late, and the Tax, VAT, Markup, Profit Margin and Hourly Rate calculators when the numbers on the invoice need to be right before you send it.
None of them require an account, a credit card or a download. You use a tool, get your answer, and move on.
Use a tool, then send a real invoice
Every tool here feeds into the invoice generator, where you fill in a form and download an A4-accurate PDF. There's no sign-up and no watermark on the finished file.
If you'd rather start from something already laid out, the invoice template generator gives you an editable template, and the estimate generator covers quotes before the work begins. Once invoices are out, payment tracking shows what's paid, due or overdue, and invoice reminders handle the follow-ups.
Who tends to use them
These calculators suit anyone who bills for their own time or sells a product at a markup — freelancers, contractors and small businesses who need a quick figure without opening accounting software. If you invoice regularly, the freelancer invoicing guide and the step-by-step guide to creating an invoice walk through the rest of the process.
Invoala is free to use, with an optional upgrade if you want more, as set out on the pricing page.
Frequently asked questions
Do these tools cost anything?
No. The tools and the invoice generator are free, with no sign-up and no credit card. There is an optional upgrade if you want more, described on the pricing page.
Do I need an account to use the calculators?
No. You can open any tool and use it straight away. Nothing on this page asks you to register or log in.
Will the invoice I download have a watermark?
No. Invoices produced from the generator download as an A4-accurate PDF with no watermark.
Which tool should I use for an overdue invoice?
Use the Invoice Due Date Calculator to confirm when payment was due, then the Late Payment Calculator to work out the interest and fees on the overdue amount.
Can I use the tools without generating an invoice?
Yes. Each tool works on its own, so you can use them purely as calculators and never open the invoice generator.