Calculators
Everyday calculators for health, dates, math and life decisions.
34 free tools, most used first
- Days Until Calculator Count down the days remaining until any date.
- BMI Calculator Featured Calculate your Body Mass Index and healthy weight range.
- Date Difference Calculator Find the number of days, weeks and months between two dates.
- BMR Calculator Calculate your Basal Metabolic Rate and daily calorie needs.
- Heart Rate Zone Calculator Find your training heart-rate zones from your age.
- Age Calculator Featured Calculate your exact age in years, months, days, hours and more.
- Ideal Weight Calculator Find your ideal body weight using the Devine formula.
- Dice Roller Roll up to 20 virtual dice with any number of sides.
- LCM and HCF Calculator Find the LCM and HCF (GCD) of two numbers.
- Ohms Law Calculator Calculate voltage, current, resistance or power from any two values.
- Average Calculator Find the mean, median, sum and standard deviation of a list of numbers.
- Binary Decimal Converter Convert between binary, decimal, hex and octal.
- Coin Flip Flip one or many virtual coins.
- Area Calculator Calculate the area and perimeter of a rectangle.
- Sleep Cycle Calculator Find the best times to fall asleep based on 90-minute sleep cycles.
- Paint Calculator Estimate how much paint you need for a wall area.
- Water Intake Calculator Estimate how much water you should drink daily.
- Love Calculator Featured A fun compatibility score between two names.
- Number to Words Converter Convert numbers to words in international and Indian formats.
- Percentage Change Calculator Calculate the percentage increase or decrease between two values.
- Roman Numeral Converter Convert numbers from 1 to 3999 into Roman numerals.
- Prime Number Checker Check whether any number is prime.
- Random Number Generator Generate a cryptographically random number in any range.
- Fraction to Decimal Calculator Convert any fraction to a decimal and percentage, and simplify it.
- Percentage Calculator Featured Calculate percentages, shares and percentage change in one place.
- Dog Age Calculator Convert your dog's age into human years with a more accurate modern formula.
- Aspect Ratio Calculator Find the aspect ratio of any size and scale dimensions proportionally.
- Pregnancy Due Date Calculator Estimate your due date from your last period.
- Quadratic Equation Solver Solve ax² + bx + c = 0 including complex roots.
- Tile Calculator Calculate how many tiles you need including 10% wastage.
- Height Converter (cm ↔ feet/inches) Convert height between centimetres and feet/inches, either direction.
- Permutation & Combination Calculator Calculate nPr (permutations) and nCr (combinations) for any n and r.
- Ratio Calculator Solve proportions (A:B = C:?) and simplify ratios.
- Scientific Notation Converter Convert any number to scientific (and E) notation, and back.
Related categories
- Finance Calculators 29 tools
- Unit Converters 11 tools
- Date & Time Tools 5 tools
- Health & Fitness 5 tools
- Student Tools 8 tools
- QR Code Tools 3 tools