Free tools
Small calculators and converters, free to use. They run in your browser: nothing you type is sent to us.
Invoice generator
Fill in an invoice with your logo, tax and discount, then save it as a PDF.
EU VAT calculator
Add or remove VAT at the standard rate of every EU country, the UK, Switzerland and Norway.
Profit margin calculator
Price, profit, margin and markup from the cost and one more figure.
Business days calculator
Working days between two dates, or the date a number of business days away.
Freelance hourly rate calculator
The hourly and day rate you need, after costs, time off and unbilled hours.
Developer cost calculator
An in-house developer, a local freelancer and an offshore developer, compared a month.
Number to words converter
Write any number or amount in words for cheques, invoices and contracts.
Sri Lanka salary calculator
Take-home pay after APIT and EPF, and what the job costs the employer.
UAE gratuity calculator
End of service benefits from the basic salary and the dates of service.
VAT calculator for Sri Lanka and the UAE
Add VAT to a price or take it out of a price that includes it.
WhatsApp link and QR code generator
A click-to-chat link and a QR code for your number, with a message ready.
Built by Avenstra Software, a software company in Sri Lanka. We build business software, integrations and AI assistants. Talk to us about your project.