Calculators
32 free tools
Everyday calculators for health, dates, math and life decisions.
Calculate your exact age in years, months, days, hours and more.
Open tool →Find the number of days, weeks and months between two dates.
Open tool →Count down the days remaining until any date.
Open tool →Calculate your Body Mass Index and healthy weight range.
Open tool →Calculate your Basal Metabolic Rate and daily calorie needs.
Open tool →Estimate how much water you should drink daily.
Open tool →Find your ideal body weight using the Devine formula.
Open tool →Find your training heart-rate zones from your age.
Open tool →Find the best times to fall asleep based on 90-minute sleep cycles.
Open tool →Estimate your due date from your last period.
Open tool →Calculate percentages, shares and percentage change in one place.
Open tool →Calculate the percentage increase or decrease between two values.
Open tool →Find the mean, median, sum and standard deviation of a list of numbers.
Open tool →Convert numbers to words in international and Indian formats.
Open tool →Convert numbers from 1 to 3999 into Roman numerals.
Open tool →Convert between binary, decimal, hex and octal.
Open tool →Check whether any number is prime.
Open tool →Find the LCM and HCF (GCD) of two numbers.
Open tool →Solve ax² + bx + c = 0 including complex roots.
Open tool →Generate a cryptographically random number in any range.
Open tool →Roll up to 20 virtual dice with any number of sides.
Open tool →Flip one or many virtual coins.
Open tool →A fun compatibility score between two names.
Open tool →Calculate voltage, current, resistance or power from any two values.
Open tool →Calculate the area and perimeter of a rectangle.
Open tool →Estimate how much paint you need for a wall area.
Open tool →Calculate how many tiles you need including 10% wastage.
Open tool →Solve proportions (A:B = C:?) and simplify ratios.
Open tool →Find the aspect ratio of any size and scale dimensions proportionally.
Open tool →Convert any fraction to a decimal and percentage, and simplify it.
Open tool →Calculate nPr (permutations) and nCr (combinations) for any n and r.
Open tool →Convert any number to scientific (and E) notation, and back.
Open tool →