Find the formula and worked example

The short answer

Scroll below the calculator. Each calculator page shows the formula it uses and a worked example, so you can check the working yourself.

How to find it

1. 1Open the calculator you want and enter your values.
2. 2Scroll past the result to the section below the calculator.
3. 3Read the formula, then the worked example with sample numbers.
4. 4Put your own numbers into the same steps to compare with the answer shown.

Checking your answer

Use the worked example as a template. Replace its sample numbers with yours and follow each step.

• Keep every decimal until the last step and round only at the end.
• A rounded total can differ by a paisa from adding rounded parts by hand.
• Check that percentages are entered as plain numbers, such as 9 for 9%.
• Make sure your numbers are in the same units the calculator used.

Some pages also show tables and charts under the worked example. These use the same formula with your values, so they are a good way to see how each input affects the answer.

The formula is shown so that nothing is hidden. If you understand the working, you can judge for yourself whether the answer suits your situation.

Longer guides

For deeper explanations, the Blogs page has guides with formulas and worked examples. Use the filter chips (Finance, Health, Math, Conversions, Everyday) or the search box.