Guides

Clear explanations of everyday calculations. Each guide includes formulas, worked examples and links to free online tools on Calculator.sarl.

Percentages & Pricing

Learn what a percentage means, how to calculate “X% of Y”, and how percentage change works with clear examples.

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Work out sale prices, savings amounts and percentage-off deals using simple formulas and step-by-step examples.

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See how principal, interest rate and loan term affect monthly payments, and what the standard repayment formula means.

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Add GST to a net price or remove GST from a gross total, with formulas, examples and important limitations.

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Convert length, weight, temperature and other units using conversion factors, with practical worked examples.

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Calculate exact age in years, months and days from a date of birth, and understand common edge cases.

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