Pro Rata Calculators is a free online tool website built for employees, HR professionals, landlords, tenants, and anyone who needs fast and accurate pro rata calculations. We cover salary, rent, holidays, insurance, and more — all in one place.
Pro rata calculations come up constantly in real life. A new employee starts mid-month. A tenant moves in on the 10th. A part-time worker needs to know their holiday entitlement. These situations happen every day, and getting the numbers wrong costs people real money.
We built this site because most calculators online are either too complicated, plastered with ads, or simply give wrong results. Every tool on Pro Rata Calculators is built around a single goal — give you the correct answer, fast, with no registration and no cost.
What We Cover
Our calculators span six main categories — salary and wages, holiday and leave entitlement, rent and tenancy, insurance premiums, general finance, and payroll. Each calculator is built with the correct real-world formula for its specific use case.
We serve both the US and UK markets. Prorated rent calculators follow US conventions. Pro rata holiday and salary calculators follow UK employment law standards. Where the calculation differs by region, we make that clear inside the tool.
Our Commitment
Every calculator on this site is free. There is no premium version, no account required, and no personal data collected when you use our tools. You run the numbers, you get your answer, and you move on.
We update our tools regularly to make sure formulas stay accurate and the experience stays clean and fast on every device.
If you spot an error in any calculator or have a suggestion for a new tool, we want to hear from you. Reach us through the Contact Us page.