Learn the method

Practical calculator guides

Our calculators give fast results; these guides explain the formula, the assumptions and the situations where a different measure may be more useful.

Math and everyday calculations

• Average, mean and median — choose the right measure and understand how outliers change the result.
• Percentage basics — parts, percentage change, reverse percentages and percentage points.
• Road trip cost planning — fuel, tolls, MPG, L/100 km and cost per person.

How Cuantalia writes guides

Each guide is built around a reproducible example. We show the arithmetic, identify the reference values and point out common mistakes. The linked calculator lets you replace the example values with your own numbers.

Results are educational estimates rather than professional financial, legal or tax advice. When a calculation depends on a current rate, price, tax or contract, use the value that applies to your situation.