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Calculators
Work out percentages, discounts, tips, ages and other everyday sums. Every calculator shows the formula it uses and a worked example, so you can check the answer by hand.
25–29 of 29 tools
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Simple Interest Calculator
Calculate simple interest and final amount from principal, annual rate and time.
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Calculators
Simple Interest Total Calculator
Calculate simple interest and total repayment or value.
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Calculators
Tip Calculator
Calculate a tip, total bill and per-person share.
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Calculators
Tire Size Calculator
Decode a tire size like 225/45R17 into diameter, sidewall height, circumference and revolutions per mile.
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Calculators
Weekly to Annual Pay Calculator
Annualize a weekly gross pay amount.
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