Free Online Calculators

Quick answers for school, work and health: percentages, ages, averages, time between dates, grades and body measurements, with the method shown so you can check it.

Percentage CalculatorX% of Y, what percent X is of Y, and percentage increase or decrease.Age CalculatorExact age in years, months and days, plus days until your next birthday.Average CalculatorMean, median, mode, range and weighted average of any list.Scientific CalculatorTrig in degrees or radians, logs, powers, roots and factorials.GPA CalculatorUS 4.0 scale GPA from letter grades and credit hours, with honors and AP weighting, cumulative GPA and the GPA you need.CGPA to PercentageCBSE CGPA × 9.5, your university's formula, or percentage back to CGPA.Marks Percentage CalculatorSubject-wise marks to total percentage, with best-of-5.Attendance CalculatorYour attendance %, classes needed for 75%, or classes you can miss.Hours CalculatorTime calculator for hours worked: time between two times with breaks and night shifts, plus a weekly timesheet.Online TimerCountdown timer with an alarm sound, presets from 1 minute to 1 hour, and the time left in the browser tab.StopwatchOnline stopwatch to a hundredth of a second with laps, fastest and slowest lap, and copy or CSV export.Travel Itinerary MakerPlan a trip day by day with times, bookings, costs and a packing list. Download a PDF, print it or save it to edit later.Date CalculatorDays between dates, weekdays, and add or subtract days.Unit ConverterLength, weight, volume, pressure, speed, energy, power, time, temperature, data and land (cent, guntha, acre).Time Zone ConverterIST to world cities with daylight saving handled.Random Number GeneratorFair random numbers in any range, with or without repeats.Random Name PickerSpin the wheel of names or pick winners from a list, with an option to remove each winner. Fair, secure random draws.Coin FlipToss a coin online: heads or tails, or up to 1,000 coins with counts and streaks.Dice RollerRoll d4, d6, d8, d10, d12 or d20 dice with a modifier and see each die and the total.BMI CalculatorBody mass index and healthy weight range with Asian cut-offs.Ideal Weight CalculatorHealthy weight for your height from the Robinson, Miller, Devine and Hamwi formulas and the BMI range, in kg or lb.Calorie CalculatorDaily calories to maintain, lose or gain weight at a safe rate, from your age, height, weight and activity. Metric or US units.Macro CalculatorGrams of protein, carbs and fat a day for your calorie target, with balanced, high-protein, low-fat or low-carb splits.BMR CalculatorBasal metabolic rate with the Mifflin–St Jeor and Harris–Benedict equations, and calories a day by activity level.TDEE CalculatorTotal daily energy expenditure (TDEE), a calorie target for fat loss or muscle gain, and protein, plus BMI with Asian cut-offs.Body Fat CalculatorBody fat % from a tape measure (US Navy method).Water Intake CalculatorEstimate how much water to drink per day from weight, exercise and weather.Period CalculatorPredict your next periods, days to go and fertile days from your last period and cycle length.Ovulation CalculatorEstimate your fertile days, ovulation day and next period from your last period and cycle length.Pregnancy Due Date CalculatorDue date, weeks pregnant and trimester from your last period.Guna Milan Calculator36-point Ashtakoot kundli matching by nakshatra and rashi, with Nadi and Bhakoot dosha check.

For students

Work out a US-style GPA with honors and AP weighting, convert CGPA to percentage, work out marks percentage across subjects, and check how many classes you can miss while staying above the attendance rule. The scientific calculator handles trigonometry, powers and logs.

Timers and random picks

Count down with the online timer, time laps with the stopwatch, and settle draws fairly with the random name picker, coin flip and dice roller, which all use your browser's secure random generator.

For work and daily life

Hours calculator adds up shifts and breaks, the date and age calculators count days, months and years exactly, and the unit and time zone converters cover everyday conversions. The travel itinerary maker plans a trip day by day, with a budget and a PDF to take with you.

Health numbers

BMI, ideal weight, body fat, BMR, TDEE, calorie, macro and water intake calculators give general estimates for healthy adults, and the period, ovulation and due date calculators estimate dates from your cycle. They aren't medical advice or contraception; talk to a doctor about your own targets.

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