Everyday date, grade and energy calculators

Work out age, calendar dates, grade averages, estimated energy needs and time remaining. We explain the assumptions behind each result so you can interpret the answer with care.

☾Hijri Date ConverterConvert Hijri dates and browse a monthly Hijri calendar.Open tool →◷Age CalculatorDiscover your precise age and next birthday countdown.Open tool →♙Grade & GPA CalculatorCalculate weighted GPA from grades and credit hours.Open tool →◈TDEE CalculatorEstimate daily energy needs and basal metabolic rate.Open tool →⌛Days Left This YearSee the live countdown to the end of the current year.Open tool →♡Life Expectancy CalculatorExplore a clearly labeled statistical lifespan illustration.Open tool →

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Work out age, calendar dates, grade averages, estimated energy needs and time remaining. We explain the assumptions behind each result so you can interpret the answer with care. Each page includes practical instructions, situations where the tool helps, frequently asked questions and limitations worth knowing before you rely on a result.

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