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Everyday calculators

Practical, free tools with clear explanations. Choose a tool to get started.

Calculate a percentage of any number instantly.

Calculate your age in years, months and days from a date of birth.

Count the days between two dates, including an optional inclusive count.

Convert common length, weight, temperature, volume, speed and area units.

See the amount saved and final price after a discount.

Evaluate arithmetic expressions with parentheses using a safe local calculator.

Calculate trigonometry, powers, roots and logarithms with a local scientific calculator.