Maths and education calculators

For students, teachers and parents: percentages, fractions, averages, grades, GPA and CGPA, attendance, graphs and a scientific calculator, many with the working shown.

All 13 tools here work now, and none of them needs credits.

Percentage CalculatorX% of Y, what percent X is of Y, percentage change, reverse percentages, percentage difference and share of a total.Age Calculator by Date of BirthYour exact age in years, months and days from your date of birth, in weeks, days and hours, the day you were born and your next birthday.Average CalculatorMean, median, mode, range, geometric mean, standard deviation and weighted average of any list, with the working.Pie Chart MakerPie, donut or bar charts from typed or pasted data, with percentages that add up to 100%, an Other slice and PNG, SVG or PDF download.Scientific CalculatorTrig in degrees or radians, logs, powers and any root, factorials, memory keys and a history of results.Graphing CalculatorPlot up to 6 functions of x, zoom and pan, trace points, find roots, turning points and intersections, and make a table of values.Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers with the steps, simplify, and convert fractions to decimals and percentages.Grade CalculatorWeighted grade for school or college, your letter grade, and the score you need on the final exam.GPA CalculatorWeighted and unweighted GPA on the US 4.0 scale from letter grades and credit hours (honors and AP), cumulative GPA and the GPA you need.CGPA to PercentageCBSE CGPA × 9.5, Anna University × 10, your university's formula, or percentage back to CGPA.Marks Percentage CalculatorSubject-wise marks with any maximum to total percentage, each subject's percentage and best-of-5.Attendance CalculatorYour attendance %, classes needed for 75%, classes you can miss, and how many of the classes left you can skip.Unit ConverterLength, weight, volume, pressure, speed, energy, power, time, temperature, fuel economy, angles, data and land (cent, guntha, acre).

Coming next: 46 more maths and education calculators are planned. Pick Planned above to see them by name; each one joins this list once it works. Tell us which one you need first.

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