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Free calculators and helpers for students — GPA, grades, dates, time zones, citations, study planners. Bookmarkable, mobile-friendly, no subscription.
Try GPA Calculator.
Free, browser-based, no signup. The rest of the category ships in 2026.
19 tools on the way.
The most-asked-for student and everyday tools. More subject-specific calculators will follow.
Grade CalculatorSoon
Compute final grade from weighted categories — homework, midterm, final, projects.
Final Grade CalculatorSoon
What you need on the final to hit any target grade. Solves the equation both ways.
Citation GeneratorSoon
MLA, APA, Chicago, Harvard, IEEE citations from a title, URL, ISBN, or DOI.
Reading-Time EstimatorSoon
Estimated reading time for any text at adjustable WPM, including comprehension breaks.
Study PlannerSoon
Spaced-repetition planner that schedules your reviews automatically before the exam.
Age CalculatorSoon
Exact age in years, months, and days from any birthdate — or between any two dates.
Date CalculatorSoon
Add or subtract days, weeks, months, or years from any date. Find the difference between two dates.
Time CalculatorSoon
Add, subtract, and convert time values — hours, minutes, seconds across multiple entries.
Hours CalculatorSoon
Total hours between two times, with support for overnight spans and multiple shifts.
Height CalculatorSoon
Convert height between feet/inches and centimeters, and predict adult height for children.
Time Zone CalculatorSoon
Convert any time between 400+ world time zones with daylight saving time handled automatically.
Time Duration CalculatorSoon
Calculate the exact duration between two date-times in days, hours, minutes, and seconds.
Day CounterSoon
Count the number of days between two dates, with optional business-day-only mode.
Day of the Week CalculatorSoon
Find what day of the week any date falls on — past or future.
Percentage CalculatorSoon
What % is X of Y, percentage increase/decrease, and reverse percentage — all in one tool.
Average CalculatorSoon
Calculate mean, median, mode, and range for any set of numbers.
Fraction CalculatorSoon
Add, subtract, multiply, and divide fractions with step-by-step working shown.
Scientific Notation ConverterSoon
Convert between standard notation and scientific notation in both directions.
Number Base ConverterSoon
Convert numbers between binary, octal, decimal, and hexadecimal instantly.
Studying something specific?
If you're prepping for a specific test (SAT, GRE, MCAT, Bar) or studying a subject with unique tools, tell us. Sub-categories ship next.
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