# avgcalc

> Free calculators that run in the browser: average (mean, median, mode), weighted average, grades and GPA, percentages, tips, ratios, GCF and LCM, time and date maths, molecular weight. Nothing typed is uploaded; every calculator shows its working. Made by David Choi (https://avgcalc.com/about/). Contact: hello@avgcalc.com

## Calculators

- [Average Calculator](https://avgcalc.com/): Free average calculator. Paste your numbers to get the mean, median, mode, sum and range instantly. Runs in your browser, nothing is uploaded.
- [Median Calculator](https://avgcalc.com/median-calculator/): Free median calculator. Paste your numbers and get the median, plus the sorted list, mean and mode. Handles odd and even counts. Runs in your browser.
- [Mean Calculator](https://avgcalc.com/mean-calculator/): Free mean calculator. Get the arithmetic mean plus variance and standard deviation (sample or population) for any list of numbers. Runs in your browser.
- [Weighted Average Calculator](https://avgcalc.com/weighted-average-calculator/): Free weighted average calculator. Enter values and their weights (percentages, credits or any numbers) and get the weighted mean with the working shown.
- [Mode Calculator](https://avgcalc.com/mode-calculator/): Free mode calculator. Paste numbers (or words) to find the mode, see the frequency table, spot ties and no-mode sets, with mean and median alongside.
- [Average Rate of Change Calculator](https://avgcalc.com/average-rate-of-change-calculator/): Free average rate of change calculator. Enter two points (x₁, y₁) and (x₂, y₂) or a function’s values at two inputs and get the rate of change with steps.
- [Grade Average Calculator](https://avgcalc.com/grade-average-calculator/): Free grade average calculator. Enter each assignment score and its weight to get your current grade and letter, then find out what you need on the final exam.
- [GPA Calculator](https://avgcalc.com/gpa-calculator/): Free GPA calculator. Enter your courses, grades and credits for your GPA, weighted or unweighted, plus quality points and cumulative GPA across terms.
- [Final Grade Calculator](https://avgcalc.com/final-grade-calculator/): Free final grade calculator. Enter your current grade, the grade you want and how much the final exam is worth to see exactly what score you need on the final.
- [Percentage Calculator](https://avgcalc.com/percentage-calculator/): Free percentage calculator: find X% of a number, what percent one number is of another, percent change, percentage difference and percent error, with the formula shown.
- [Tip Calculator](https://avgcalc.com/tip-calculator/): Free tip calculator. Enter the bill and tip percent, split between any number of people, and see the tip, total and each person’s share instantly.
- [Proportion Calculator](https://avgcalc.com/proportion-calculator/): Free proportion calculator. Fill in three of the four values in a/b = c/d and get the missing one, with the cross-multiplication shown step by step.
- [Ratio Calculator](https://avgcalc.com/ratio-calculator/): Free ratio calculator. Simplify a ratio to lowest terms, scale it up or down, convert it to a fraction, decimal and percent, and compare two ratios.
- [GCF Calculator](https://avgcalc.com/gcf-calculator/): Free GCF calculator. Enter two or more numbers to get the greatest common factor, the least common multiple and the prime factorization of each, with steps.
- [Time Duration Calculator](https://avgcalc.com/time-duration-calculator/): Free time duration calculator. Enter a start and end time (with dates if needed) and get the elapsed time in hours and minutes, plus total minutes, hours and days.
- [Days From Today Calculator](https://avgcalc.com/days-from-today-calculator/): Find the exact date any number of days from today, or days ago. Calendar or business days, with the weekday and weeks-and-days breakdown.
- [Days Until Calculator](https://avgcalc.com/days-until-calculator/): Count the days until any date, in days, weeks and days, hours and business days. Also works backwards for dates that have passed.
- [Hours Ago / From Now Calculator](https://avgcalc.com/hours-ago-calculator/): Find what time it was any number of hours ago, or what time it will be in X hours, from your current time or any time you choose. Shows the date too.
- [Time Unit Converter](https://avgcalc.com/time-unit-converter/): Convert between seconds, minutes, hours, days, weeks, months and years. Shows the result in every unit at once, with a days-hours-minutes breakdown.
- [Molecular Weight Calculator](https://avgcalc.com/molecular-weight-calculator/): Free molecular weight calculator. Type a chemical formula like C6H12O6 or Ca(OH)2 and get the molar mass in g/mol, the atom count and each element’s share.

## Learn

- [What Is the Mode in Math?](https://avgcalc.com/learn/what-is-the-mode-in-math/): The mode is the value that appears most often in a set of numbers. Learn how to find it, what bimodal and "no mode" mean, and how it differs from mean and median.
- [What Is a Good GPA?](https://avgcalc.com/learn/what-is-a-good-gpa/): A 3.0 is the common minimum, 3.5 is the honors line, 3.7+ is competitive for selective schools. What each GPA means for college, scholarships and grad school.
- [Is a 4.0 GPA Good?](https://avgcalc.com/learn/is-a-4-0-gpa-good/): Perfect: a 4.0 GPA is about a A. A 4.0 is straight As. It clears the GPA line for almost every honors program, scholarship and graduate school; a few mer
- [Is a 3.9 GPA Good?](https://avgcalc.com/learn/is-a-3-9-gpa-good/): Excellent: a 3.9 GPA is about a A. A 3.9 is essentially straight As with one A−. It is competitive for the most selective colleges and graduate programs, a
- [Is a 3.8 GPA Good?](https://avgcalc.com/learn/is-a-3-8-gpa-good/): Excellent: a 3.8 GPA is about a A-. A 3.8 puts you well into the top tier. It clears honors thresholds (usually 3.5) and is competitive at highly selective
- [Is a 3.7 GPA Good?](https://avgcalc.com/learn/is-a-3-7-gpa-good/): Very good: a 3.7 GPA is about a A-. A 3.7 is an A− average. It is a strong GPA for admissions and scholarships, above the cut-off for Dean’s List at most co
- [Is a 3.6 GPA Good?](https://avgcalc.com/learn/is-a-3-6-gpa-good/): Very good: a 3.6 GPA is about a A-/B+. A 3.6 is between an A− and a B+. It is above the national average for college students (about 3.1) and above the usual 3
- [Is a 3.5 GPA Good?](https://avgcalc.com/learn/is-a-3-5-gpa-good/): Good: a 3.5 GPA is about a B+. A 3.5 is a B+ average and the classic honors cut-off: many colleges use 3.5 for Dean’s List and cum laude. It is solid f
- [Is a 3.4 GPA Good?](https://avgcalc.com/learn/is-a-3-4-gpa-good/): Good: a 3.4 GPA is about a B+. A 3.4 is a B+ average, above the national college average (about 3.1). It is a good GPA; pushing to 3.5 opens honors lis
- [Is a 3.3 GPA Good?](https://avgcalc.com/learn/is-a-3-3-gpa-good/): Good: a 3.3 GPA is about a B+. A 3.3 is exactly a B+ under the standard scale. It is above average and meets the minimum for most graduate programs (ty
- [Is a 3.2 GPA Good?](https://avgcalc.com/learn/is-a-3-2-gpa-good/): Above average: a 3.2 GPA is about a B. A 3.2 is a B average, slightly above the national college average. It clears the common 3.0 minimum for graduate school
- [Is a 3.0 GPA Good?](https://avgcalc.com/learn/is-a-3-0-gpa-good/): Average to good: a 3.0 GPA is about a B. A 3.0 is a B average. It is the most common minimum for graduate school and for renewing many merit scholarships. (Ordi
- [Is a 2.7 GPA Good?](https://avgcalc.com/learn/is-a-2-7-gpa-good/): Below average: a 2.7 GPA is about a B-. A 2.7 is a B− average. It is fine for graduation, but below the 3.0 minimum many programs and employers set. Raising it
- [Is a 2.5 GPA Good?](https://avgcalc.com/learn/is-a-2-5-gpa-good/): Below average: a 2.5 GPA is about a B-/C+. A 2.5 sits between a B− and a C+. Most colleges require 2.0 to stay in good standing, so you are safe, but scholarshi
- [Is a 2.0 GPA Good?](https://avgcalc.com/learn/is-a-2-0-gpa-good/): Minimum: a 2.0 GPA is about a C. A 2.0 is a C average and the usual minimum to remain in good academic standing and to graduate. Anything lower typically
- [What Is Cumulative GPA?](https://avgcalc.com/learn/what-is-cumulative-gpa/): Cumulative GPA is your grade point average across every term so far, weighted by credits. How it differs from semester GPA and how to calculate it.
- [How to Calculate the Percentage of a Number](https://avgcalc.com/learn/how-to-calculate-percentage-of-a-number/): To find a percentage of a number, multiply the number by the percent and divide by 100. 35% of 80 = 28. Worked examples, shortcuts and a live calculator.
- [How to Calculate Percent Error](https://avgcalc.com/learn/how-to-calculate-percent-error/): Percent error = |measured − accepted| ÷ accepted × 100. Measuring 9.8 for a true value of 10 gives 2% error. Formula, worked examples and a calculator.
- [How to Calculate Percentage Difference](https://avgcalc.com/learn/how-to-calculate-percentage-difference/): Percentage difference = |a − b| ÷ ((a + b) ÷ 2) × 100. For 50 and 75 it is 40%. When to use it instead of percent change, with examples and a calculator.
- [How Many Seconds in a Day?](https://avgcalc.com/learn/how-many-seconds-in-a-day/): There are 86,400 seconds in a day: 24 hours × 60 minutes × 60 seconds. A day has 24 hours, each hour has 60 minutes and each minute has 60 seconds. Multiply the
- [How Many Minutes in a Day?](https://avgcalc.com/learn/how-many-minutes-in-a-day/): There are 1,440 minutes in a day: 24 hours × 60 minutes. Twenty-four hours in a day, sixty minutes in each hour: 24 × 60 = 1,440. Half a day is 720 minutes, an
- [How Many Hours in a Week?](https://avgcalc.com/learn/how-many-hours-in-a-week/): There are 168 hours in a week: 7 days × 24 hours. Seven days, twenty-four hours each: 7 × 24 = 168. A standard 40-hour work week is just under a quarter of that
- [How Many Seconds in an Hour?](https://avgcalc.com/learn/how-many-seconds-in-an-hour/): There are 3,600 seconds in an hour: 60 minutes × 60 seconds. Sixty minutes in an hour, sixty seconds in a minute: 60 × 60 = 3,600. Half an hour is 1,800 seconds
- [How Many Hours in a Month?](https://avgcalc.com/learn/how-many-hours-in-a-month/): A month has 672 to 744 hours depending on its length; the average month is 730.5 hours. Months are not all the same length, so there is no single answer. Multip
- [How Many Minutes in a Year?](https://avgcalc.com/learn/how-many-minutes-in-a-year/): There are 525,600 minutes in a normal year and 527,040 in a leap year. 365 days × 24 hours × 60 minutes = 525,600. A leap year adds a day: 527,040. Averaged ove
- [How Long Is 72 Hours?](https://avgcalc.com/learn/how-long-is-72-hours/): 72 hours is exactly 3 days (72 ÷ 24 = 3). Divide hours by 24 to get days: 72 ÷ 24 = 3. So a "72-hour" deadline that starts on Monday at 9 AM ends on Thu
- [How Long Is 90 Minutes?](https://avgcalc.com/learn/how-long-is-90-minutes/): 90 minutes is 1.5 hours, or 1 hour and 30 minutes. Divide minutes by 60 to get hours: 90 ÷ 60 = 1.5. That is one full hour with 30 minutes left over. A 90-minut
- [How to Find the Average](https://avgcalc.com/learn/how-to-find-the-average/): To find the average, add up all the numbers and divide by how many there are. 4 + 8 + 15 = 27, ÷ 3 = 9. Worked examples, common mistakes and a live calculator.
- [Is a D a Passing Grade?](https://avgcalc.com/learn/is-a-d-a-passing-grade/): Usually yes: a D (60–69%) is the lowest passing grade in most US high schools and colleges. But it may not count for your major, prerequisites or transfer credit. Details by situation.

## Preset pages

Live answers for common values, generated from the same calculators.

- `https://avgcalc.com/days-from-today/<value>/` (15 pages), e.g. [7 Days From Today](https://avgcalc.com/days-from-today/7/)
- `https://avgcalc.com/days-ago/<value>/` (5 pages), e.g. [7 Days Ago](https://avgcalc.com/days-ago/7/)
- `https://avgcalc.com/hours-ago/<value>/` (27 pages), e.g. [1 Hour Ago](https://avgcalc.com/hours-ago/1/)
- `https://avgcalc.com/hours-from-now/<value>/` (27 pages), e.g. [1 Hour From Now](https://avgcalc.com/hours-from-now/1/)
- `https://avgcalc.com/hours-to-days/<value>/` (11 pages), e.g. [24 Hours to Days](https://avgcalc.com/hours-to-days/24/)
- `https://avgcalc.com/minutes-to-hours/<value>/` (9 pages), e.g. [90 Minutes to Hours](https://avgcalc.com/minutes-to-hours/90/)
- `https://avgcalc.com/days-until/<value>/` (17 pages), e.g. [Days Until New Year's Day](https://avgcalc.com/days-until/new-years-day/)

## Site

- [About avgcalc](https://avgcalc.com/about/): who makes it, how the maths is checked, how to report a wrong answer.
- [Privacy policy](https://avgcalc.com/privacy/)
- [Terms of use](https://avgcalc.com/terms/)
- [Full reference for LLMs](https://avgcalc.com/llms-full.txt)
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