Calculators

Calculate your exact age in years, months, days, hours and more.

Find the number of days, weeks and months between two dates.

Count down the days remaining until any date.

Calculate your Body Mass Index and healthy weight range.

Calculate your Basal Metabolic Rate and daily calorie needs.

Estimate how much water you should drink daily.

Find your ideal body weight using the Devine formula.

Find your training heart-rate zones from your age.

Find the best times to fall asleep based on 90-minute sleep cycles.

Estimate your due date from your last period.

Calculate percentages, shares and percentage change in one place.

Calculate the percentage increase or decrease between two values.

Find the mean, median, sum and standard deviation of a list of numbers.

Convert numbers to words in international and Indian formats.

Convert numbers from 1 to 3999 into Roman numerals.

Convert between binary, decimal, hex and octal.

Check whether any number is prime.

Find the LCM and HCF (GCD) of two numbers.

Solve ax² + bx + c = 0 including complex roots.

Generate a cryptographically random number in any range.

Roll up to 20 virtual dice with any number of sides.

Flip one or many virtual coins.

A fun compatibility score between two names.

Calculate voltage, current, resistance or power from any two values.

Calculate the area and perimeter of a rectangle.

Estimate how much paint you need for a wall area.

Calculate how many tiles you need including 10% wastage.

Solve proportions (A:B = C:?) and simplify ratios.

Find the aspect ratio of any size and scale dimensions proportionally.

Convert any fraction to a decimal and percentage, and simplify it.

Calculate nPr (permutations) and nCr (combinations) for any n and r.

Convert any number to scientific (and E) notation, and back.