Calculators
Everyday calculators for health, dates, math, and quick numbers, all in your browser.
Free online calculators give you reliable answers for health, dates, math, and everyday measurements without leaving your browser. The entire calculation happens on your device, so nothing is uploaded, nothing requires an account, and results appear the instant you finish typing.
Start with the BMI Calculator to check body metrics using height and weight, or the Age Calculator when you need exact years, months, and days between two dates. The Calorie Calculator and BMR Calculator help with daily energy needs and basal metabolism estimates.
Other frequent uses include percentage change, GPA, standard deviation, and fraction work. Every tool stays lightweight, works offline once loaded, and respects your privacy because the numbers never travel anywhere. Use them on desktop or phone; the interfaces stay clear and the math stays accurate.
- Age CalculatorCalculate exact age in years, months, and days between a birth date and any reference date. Handles leap years correctly. Free and private.
- Average CalculatorCalculate mean, median, mode, min, max, range, and sum for a list of numbers. Paste values and get instant stats. Free and private in your browser.
- BMI CalculatorCalculate body mass index from weight and height in metric or imperial units. See the category and healthy ranges instantly. Private and free.
- BMR CalculatorEstimate basal metabolic rate using the Mifflin St Jeor equation. Enter sex, weight, height, and age for daily calories at complete rest. Private.
- Body Fat CalculatorEstimate body fat percentage with the US Navy circumference method. Enter height, neck, waist, and hip (for women) in centimetres. Fast and private.
- Calorie CalculatorEstimate daily maintenance calories (TDEE). Compute BMR with Mifflin St Jeor then multiply by activity level. Choose from five activity factors. Private.
- Date Difference CalculatorCalculate the exact difference between two dates in total days, weeks, and a calendar breakdown of years, months, and days. Handles order automatically.
- Ideal Weight CalculatorEstimate ideal body weight with both the Devine and Robinson formulas. Switch between centimetres and inches. Results in kilograms, client side only.
- Time Duration CalculatorCalculate hours and minutes between two HH:MM times. Automatically handles spans that cross midnight. Simple, accurate, and private.
- Standard Deviation CalculatorCalculate mean, variance, and standard deviation for a data set. Get both population and sample results from comma, space, or newline separated numbers.
- GPA CalculatorCalculate your weighted GPA from each course grade points and credit hours. Free, fast, and private. Works on the 0 to 4.0 scale.
- Pace CalculatorCalculate running pace per km and per mile plus average speed from a distance and total time. Free, fast, and works in your browser.
- Fraction CalculatorAdd, subtract, multiply, or divide two fractions. Get a simplified fraction reduced by GCD plus the decimal value, with division by zero guarded.
- Ratio CalculatorSimplify a ratio to its lowest terms with the GCD, or solve a proportion a:b = c:x for the missing value. Free and instant.
- Random Number GeneratorGenerate random integers between any min and max. Pick how many you need and choose unique values with no repeats. Free and runs in your browser.
- Percentage Change CalculatorFind the percentage change between two numbers. See the increase or decrease and the exact difference instantly, with a guard for an old value of zero.