GPA Calculator
Convert letter grades and credit hours into a 4.0 grade point average, with a weighted option for honours and AP courses.
Everyday Calculators
GPA, grades, attendance, ages, date gaps, shift durations and paid work hours — the small calculations that come up every week.
10 free calculators
Education, Time & Everyday
GPA, grades, attendance, ages, date gaps, shift durations and paid work hours — the small calculations that come up every week.
This is the quietly busiest shelf on the site. Nobody plans to work out an exact age or how many working days sit between two dates, but everybody ends up needing to.
The academic half runs in a sequence. The grade calculator combines assignment scores and their weights into a current course grade. The final grade calculator answers the question every student asks in the last month of term: what do I need on the final to finish with the grade I want. The GPA calculator rolls whole courses into a 4.0 grade point average, with a weighted option for honours and AP classes. And the attendance calculator handles the requirement most institutions enforce quietly until it becomes a problem.
The date half is deceptively fiddly. The age calculator returns years, months and days, plus total days lived and a countdown to the next birthday. Date difference and days between dates look similar but answer different questions — one gives a full duration breakdown, the other a count with optional weekend and holiday exclusion for project planning. The birthday calculator adds the fun ones: the weekday you were born, your 10,000-day milestone, your zodiac sign and generation.
Finally the working ones. Time duration subtracts a start time from an end time, handles shifts that cross midnight, and gives the answer in decimal hours for payroll. Work hours adds a whole week of shifts, splits regular from overtime, and turns the total into gross pay.
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All 10 everyday calculators
Grade Calculator
Combine assignment scores and their weights into a current course grade, letter grade and the points still available.
Final Grade Calculator
Find the exact score you need on a final exam to finish a course at your target grade, given its weight.
Attendance Calculator
Check your attendance percentage against a required minimum, and see how many classes you must attend or can still miss.
Age Calculator
Get an exact age in years, months and days from any birth date, plus total days lived and a countdown to the next birthday.
Date Difference Calculator
Measure the gap between two dates in years, months, weeks and days, with an option to include or exclude the end date.
Days Between Dates Calculator
Count calendar days, weeks and business days between two dates, with weekends and named holidays excluded on request.
Time Duration Calculator
Subtract a start time from an end time, take out breaks, and get the result in hours, minutes and decimal hours.
Work Hours Calculator
Add up a week of shifts with breaks, split regular from overtime hours, and turn the total into gross pay.
Birthday Calculator
See the weekday you were born, days until your next birthday, milestone dates like 10,000 days, your zodiac sign and generation.
How to choose the right tool
Date difference or days between? Use date difference when you want a human answer — "3 years, 2 months and 14 days". Use days between dates when you want a count you can plan with, especially business days with weekends and holidays removed.
Grade or final grade? The grade calculator tells you where you stand now. The final grade calculator tells you what is still possible, and it is honest about impossibility — if you need 112% on the final, it says so rather than rounding it into hope.
Weighted or unweighted GPA? Unweighted caps every course at 4.0. Weighted adds a point for honours or AP classes, so a transcript can exceed 4.0. Schools differ, and admissions offices frequently recalculate using their own scale, so the GPA calculator computes both.
All date arithmetic here is done in UTC with real calendar days, including leap years, so a duration that spans a daylight-saving change does not silently gain or lose an hour.
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Everyday questions
Rearrange the weighted average: needed = (target − current × (1 − weight)) ÷ weight. With an 82% going in, a final worth 30% and a target of 85%, you need 92%. The final grade calculator does the arithmetic and flags when the target is unreachable.
Multiply each course's grade points by its credit hours, add those products, then divide by total credit hours. An A (4.0) in a 3-credit course and a B (3.0) in a 4-credit course gives (12 + 12) ÷ 7 = 3.43.
Count calendar days, subtract weekends, then subtract public holidays that fall on weekdays. The days between dates calculator does all three and lets you add your own holiday dates, since they vary by country and often by region.
Yes. It counts real calendar days, so someone born on 29 February gets an accurate day count, and their birthday countdown falls on the date your locale conventionally uses in non-leap years.
Divide the minutes by 60 and add: 7 hours 45 minutes is 7 + 45/60 = 7.75 hours. The time duration calculator and work hours calculator both report decimal hours alongside the h:m format.
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