We build one strong page for each question a student needs answered, and not several near-copies. We add a separate page for a country only when that country’s rules change the calculation. A weighted average is the same everywhere, so it is one page. Visa funds and loan repayments differ by country, so they are separate.

We start with the source that makes the rule. That means government pages, tax offices, immigration authorities, admissions bodies and the universities themselves. We use other sources only to understand a topic, and we do not use them as the source of a figure.

• Each outside figure is stored with its source, its web address and the date we read it.
• Each page lists its sources in plain view, in the footer, with the date it was last reviewed.
• Where an official source is unclear or two sources disagree, we say so on the page.

• The formulas are written as plain code and covered by automated tests.
• Where an official worked example exists, such as a loan repayment example from a tax office, the tests reproduce it.
• Worked examples on a page are calculated by the same code as the calculator, so the text and the tool cannot disagree.
• We test edge cases, such as blank entries, zero, very large numbers and values that make no sense, so a page shows a clear message and not a broken result.

• what to enter and why,
• how the result is calculated,
• a worked example,
• the assumptions we made,
• common mistakes,
• answers to questions students ask,
• the sources and the date they were last checked.

Official figures change. Each page shows the date its figures were last reviewed and the date the next review is due. We review pages that depend on yearly figures, such as loan thresholds, visa funds and fees, when the official source changes and at least once a year. If a figure is out of date, we update it and change the date.

If you find a mistake, email hello@sabicalculator.com with the page, what you saw and the source you are checking against. We check it, fix it if it is wrong, and update the review date. If a correction changes a result in a way that matters, we say so on the page.

The site is paid for by advertising. Ads do not change a result, a recommendation or the order of content. We do not accept payment to change a calculation, to rank one option above another or to publish a sponsored result. See our Privacy Policy for how ads work.

The calculators run in your browser, so the numbers you type are never sent to us. See the Privacy Policy.

We use AI tools to help draft and edit pages and to help write and test code. Every figure comes from the official source named on its page, the calculations are covered by automated tests, and we check the pages against those sources. AI tools can make mistakes, which is a reason we publish our sources and ask you to tell us about any errors.

• We do not give financial, immigration, tax or legal advice. See the Disclaimer.
• We do not guess at figures. If we cannot find an official source, we do not publish a number, or we label it clearly as an assumption.
• We do not collect the numbers you enter.

Email hello@sabicalculator.com with corrections, questions or ideas.