Accurate math and date calculators, organized by category, with transparent formulas and practical examples.
Quick access to frequently used tools for everyday math and date questions.
Find percentages, changes, increases, and differences.
Calculate exact age in years, months, and days.
Find the mean of any list of numbers.
Find elapsed time between any two dates.
Calculate with fractions and simplify the exact result.
Evaluate powers, roots, logs, trig functions, and expressions.
Work with percentages, averages, fractions, ratios, factors, decimals, and scientific expressions.
Find percentages, changes, increases, and differences.
Find the mean of any list of numbers.
Calculate an average when some values count more than others.
Calculate with fractions and simplify the exact result.
Simplify ratios, scale them, and solve proportions.
Find the greatest factor shared by multiple integers.
Find the smallest positive multiple shared by multiple integers.
Calculate with decimals and view the exact fraction.
Solve any missing term in an equivalent proportion.
Check whether a whole number is prime or composite.
Evaluate powers, roots, logs, trig functions, and expressions.
Calculate ages, date differences, durations, working days, birthdays, countdowns, and week numbers.
Calculate exact age in years, months, and days.
Find elapsed time between any two dates.
Find elapsed days, hours, minutes, and seconds.
Count weekdays between two calendar dates.
Find your next birthday, countdown, weekday, and age.
Count down to a future date and time.
Find the ISO week number and weekday for a date.
Every NumUtility calculator is designed for quick use and careful understanding. Your entries stay in your browser, results update immediately, and each tool includes the formula, examples, and answers to common questions.
Need to change a measurement instead? Browse our unit converters, or visit our number guides to learn the method behind the result.