Calculator
GPA Calculator
Estimate a GPA from course grade-point values and credit weights.
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Calculators
Browse practical calculators and utilities by topic. Each tool is designed to solve a specific question, with clear inputs and readable results.
Calculator
Countdown Calculator
Count the calendar days until a target date.
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Time Card Calculator
Estimate shift hours after an unpaid break and calculate basic gross pay.
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Time Duration Calculator
Calculate the duration between two times.
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Business Days Calculator
Estimate business days between dates using a selectable weekend pattern.
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Date Add / Subtract Calculator
Find a date after or before a known start date.
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Days Between Dates Calculator
Count the days separating dates and include both endpoints if needed.
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Date Difference Calculator
Calculate elapsed time between two calendar dates.
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Age Calculator
Calculate age as of any chosen date, not only today.
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Ovulation Date Estimator
Estimate a possible ovulation date from a typical cycle length.
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