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Best Free Online Tools for Students

The homework and exam toolkit: calculate your GPA and the grade you need on the final, work through geometry area and volume, solve equations, run statistics like standard deviation and confidence intervals, and check chemistry and physics formulas. Everything is free with no account, so you can get the answer and the method without hitting a paywall or an ad wall. All 118 tools below are free, run in your browser, and need no sign-up.

Ohm's Law CalculatorEnter any two of voltage, current, resistance or power and instantly solve for the other two using V=IR and P=VI.Resistor Color Code CalculatorPick the bands on a 4, 5 or 6 band resistor and read the resistance value, tolerance and temperature coefficient.Scientific Notation ConverterConvert any decimal number to scientific and E notation, or expand scientific notation back to a plain decimal.Significant Figures CounterCount the sig figs in any number and round it to a chosen number of significant figures instantly.pH CalculatorConvert between hydrogen ion concentration and pH, find pOH and hydroxide concentration, and classify a solution as acid or base.Molarity CalculatorSolve for molar concentration, moles of solute, or solution volume using M equals moles divided by liters. Enter any two.Molar Mass CalculatorType a chemical formula like H2O or Ca(OH)2 and get its molar mass in grams per mole with a per element breakdown.Density CalculatorSolve for density, mass, or volume using density equals mass over volume. Enter any two values and get the third instantly.Force Calculator (F = ma)Solve for force, mass, or acceleration with F equals m times a. Enter any two and get the third.Kinetic Energy CalculatorCompute kinetic energy from mass and velocity, or solve for mass or speed, using KE equals one half m v squared.Gravitational Potential Energy CalculatorCompute PE from mass, gravity and height using PE equals m g h, or solve for any missing value.Wavelength Frequency ConverterConvert between wavelength and frequency for light or any wave using c equals lambda times f. Set the wave speed.Voltage Divider CalculatorEnter the input voltage and two resistor values to find the output voltage using Vout equals Vin times R2 over R1 plus R2.Capacitor Code CalculatorEnter a 3 digit ceramic capacitor code like 104 and get the capacitance in picofarads, nanofarads and microfarads.Weight on Other Planets CalculatorEnter your weight on Earth to see what you would weigh on the Moon, Mars, Jupiter and every planet in the solar system.Ideal Gas Law CalculatorSolve PV equals nRT for pressure, volume, moles or temperature. Enter any three values using SI units and get the fourth.Torque CalculatorCompute torque from force, lever arm length and angle using tau equals force times radius times the sine of the angle.Percent Error CalculatorCompare a measured value against the true value and get the absolute error and percent error for lab reports instantly.Decibel (dB) CalculatorConvert a power or amplitude ratio to decibels and back, using 10 log for power and 20 log for voltage or amplitude ratios.Speed Distance Time CalculatorSolve for speed, distance or time using speed equals distance over time. Enter any two values and get the third.Acceleration CalculatorFind acceleration from the change in velocity over time using a equals delta v over t, or solve for velocity or time.Projectile Range CalculatorEnter launch speed and angle to find range, maximum height and flight time for a projectile on level ground.Half-Life CalculatorFind the remaining amount of a decaying substance after a given time, or work out its half-life from an amount and elapsed time.Specific Heat CalculatorSolve the heat equation Q equals m c delta T for heat energy, mass, specific heat or temperature change. Enter any three.Prime Number CheckerEnter any whole number and instantly see whether it is prime or composite, with its smallest factor when it is not.Prime Factorization CalculatorBreak any whole number into its prime factors and see the result in expanded and exponent form instantly.Factorial CalculatorCompute n factorial for any non-negative integer, with exact big-integer results and no rounding for large inputs.Fibonacci Sequence GeneratorProduce the first N Fibonacci numbers with exact big-integer values, plus the nth term and running sum.Percentage Increase and Decrease CalculatorFind the percent change between two numbers and the new value after applying a percentage.Ratio SimplifierReduce any ratio to its simplest whole-number form and see the decimal equivalent, using the greatest common divisor.Mean, Median, Mode and Range CalculatorPaste a list of numbers and get all four measures of center and spread instantly, with the count and sum.Number to Words ConverterSpell any whole number in plain English, from zero up into the trillions, for checks, contracts and homework.Base Converter (Any Base 2 to 36)Convert a number between binary, octal, decimal, hex and any custom base with one entry.Modulo CalculatorFind the remainder of a division, plus the quotient and the true mathematical modulo, for any two numbers instantly.Exponent CalculatorRaise any base to any power, including negative and fractional exponents, and see the exact or precise decimal result.Logarithm CalculatorCompute the log of any positive number in any base, including natural log and log base 10, with the exponent check shown.Permutation and Combination CalculatorCompute nPr and nCr for any n and r using exact big-integer math, with the factorial formulas shown.Probability CalculatorFind the probability of single and combined events, including AND, OR, and NOT, as a fraction, decimal and percentage.Fraction to Decimal ConverterTurn any fraction into its decimal value and percentage, and see repeating digits marked clearly.Decimal to Fraction ConverterTurn any decimal into its exact simplified fraction, including repeating decimals, plus a mixed number form.Proportion Solver (Solve for X)Cross multiply to solve for the missing value in a proportion a over b equals c over x, with the work shown.Slope Calculator (Two Points)Enter two points and get the slope, the line equation, the angle in degrees, and the y-intercept instantly.Distance Between Two Points CalculatorUse the distance formula to find the straight-line length between two coordinates, with the steps shown.Midpoint CalculatorFind the exact midpoint between two coordinates using the midpoint formula, averaging the x and y values.Scientific Notation to DecimalSwitch between standard decimal numbers and scientific notation both ways, with the E-notation form shown too.Rounding Calculator (Decimals and Sig Figs)Round any number to a set number of decimal places, significant figures, or the nearest ten, hundred or thousand.LCM of a List CalculatorFind the least common multiple of many numbers at once, using exact big-integer math so large results stay precise.GCF of a List CalculatorFind the GCF of many numbers at once using the Euclidean algorithm, exact for very large values.Arithmetic Series Sum CalculatorSum an arithmetic sequence from its first term, common difference and length, or find the nth term instantly.Triangle Area Calculator (Heron Formula)Find the area of any triangle from its three sides using Heron formula, or from a base and height, instantly.Weighted GPA CalculatorAdd course grades, credit hours and class level (regular, honors, AP or IB) to get your weighted GPA.Semester GPA CalculatorEnter each class letter grade and credit hours for one term to get your semester grade point average on a 4.0 scale.College GPA CalculatorEnter each course grade and credits to compute your college GPA on the standard 4.0 university scale.High School GPA CalculatorFree high school GPA calculator on the 4.0 unweighted scale. Enter your class grades to instantly find your high school grade point average.Grade CalculatorEnter your scores and the weight of each category to compute your overall course grade and letter.Final Exam Grade Needed CalculatorFind the score you need on your final exam to hit your target grade. Enter your current grade, the target and the final worth to get the answer.Test Score Percentage CalculatorConvert correct answers out of total questions into a percentage and letter grade. Free instant test and quiz score calculator for students.Letter Grade CalculatorConvert a percentage score into a letter grade and 4.0 grade point instantly. Free percentage to letter grade calculator with a full scale table.Pass or Fail Grade CalculatorCheck if your score passes and how far you are from the passing mark. Free pass or fail calculator with a custom passing threshold for any test.Class Rank Percentile CalculatorConvert your class rank and class size into a percentile and top percent. Free class rank percentile calculator for high school and college.Points Needed to Pass CalculatorWork out how many more points you need to reach your target grade. Free points needed calculator using points earned out of total points possible.Grade Curve CalculatorApply a class curve to a raw score. Free grade curve calculator supporting flat point boost, square root curve and top score scaling methods.Attendance Percentage CalculatorCalculate your attendance percentage from classes attended and total held, and see how many you can still miss to stay above a required minimum.Credit Hours to Study Time CalculatorEstimate weekly study hours and total workload from your enrolled credit hours using the standard two hours of study per credit guideline.Reading Assignment Time EstimatorEstimate how long a reading assignment will take from page or word count, difficulty and your reading speed. Free study planner for students.Study Time PlannerSplit your available study hours across subjects by priority weight. Free study time planner that shows how many hours to give each subject per week.Exam Countdown CalculatorCount down to your exam date and see days, weeks and study days left, plus suggested daily study time to cover your material in time.Grade Impact PlannerSee how a future assignment score changes your overall grade before you submit it. Free grade impact planner using current grade and item weight.Spaced Repetition Interval CalculatorGenerate spaced repetition review dates for a flashcard using a Leitner style schedule. Free spaced repetition interval calculator for studying.Weighted Average Grade CalculatorAverage several grades where each has a different weight. Free weighted average grade calculator for combining tests, projects and homework fairly.IB Diploma Points CalculatorAdd up your IB subject grades plus the extended essay and theory of knowledge bonus to get your total out of 45 and check if you pass the diploma.Percentage to 4.0 GPA ConverterConvert a percentage grade into a 4.0 scale GPA value and letter grade. Free percentage to GPA converter for transcripts and study abroad applications.Circle Area CalculatorEnter a radius or diameter to get the area of a circle instantly using pi times r squared, right in your browser.Circle Circumference CalculatorEnter a radius or diameter to get the distance around a circle using 2 pi r, instantly in your browser.Rectangle Area CalculatorEnter length and width to get the area and perimeter of a rectangle instantly, all in your browser.Square Area CalculatorEnter the side length to get the area, perimeter and diagonal of a square instantly in your browser.Trapezoid Area CalculatorEnter the two parallel sides and the height to get the area of a trapezoid instantly in your browser.Parallelogram Area CalculatorEnter the base and height to get the area of a parallelogram instantly using base times height in your browser.Rhombus Area CalculatorEnter the two diagonals to get the area of a rhombus instantly using half the product of the diagonals in your browser.Ellipse Area CalculatorEnter the semi major and semi minor axes to get the area of an ellipse instantly using pi times a times b.Regular Polygon Area CalculatorEnter the number of sides and side length to get area and perimeter of any regular polygon in your browser.Hexagon CalculatorEnter the side length to get area, perimeter, and both the long and short diagonals of a hexagon instantly.Sector Area CalculatorEnter the radius and central angle in degrees to get the area of a pie slice sector instantly in your browser.Arc Length CalculatorEnter the radius and central angle to get the arc length of a circle using r times theta, instantly in your browser.Heron Formula CalculatorEnter the three side lengths of a triangle to get its area using Heron formula instantly in your browser.Triangle Perimeter CalculatorEnter the three side lengths to get the perimeter and semi perimeter of a triangle instantly in your browser.Pythagorean Theorem CalculatorEnter two sides of a right triangle to find the hypotenuse or a missing leg using a squared plus b squared.Right Triangle CalculatorEnter the two legs to get the hypotenuse, area, perimeter and both acute angles of a right triangle instantly.Cube Volume CalculatorEnter the edge length to get the volume, surface area and diagonal of a cube instantly using edge cubed in your browser.Rectangular Prism Volume CalculatorEnter length, width and height to get the volume and surface area of a box instantly in your browser.Sphere Volume CalculatorEnter the radius to get the volume and surface area of a sphere instantly using four thirds pi r cubed in your browser.Cylinder Volume CalculatorEnter the radius and height to get the volume and surface area of a cylinder instantly using pi r squared h.Cone Volume CalculatorEnter the radius and height to get the volume, slant height and surface area of a cone instantly in your browser.Pyramid Volume CalculatorEnter the base edge and height to get the volume, slant height and surface area of a pyramid in your browser.Surface Area of a Box CalculatorEnter length, width and height to get the total surface area of a rectangular box instantly in your browser.3D Distance CalculatorEnter two points in x y z space to get the straight line distance between them instantly using the 3D distance formula.Confidence Interval CalculatorEnter a sample mean, standard deviation and size to get the lower and upper bounds at 90, 95 or 99 percent.Sample Size CalculatorEnter your confidence level, margin of error and population to find how many responses you need.Margin of Error CalculatorEnter a sample proportion, sample size and confidence level to find the plus or minus error of your poll.Z-Score CalculatorEnter a value, mean and standard deviation to find how many standard deviations it sits from the average, with percentile.P-Value from Z-Score CalculatorEnter a z value and choose a one or two tailed test to get the exact p-value for hypothesis testing.Percentile CalculatorPaste a data set and pick a percentile from 0 to 100 to find the value at that position using linear interpolation.Percentile Rank CalculatorPaste a data set and a value to find what percent of the numbers fall at or below it, from 0 to 100.Correlation Coefficient CalculatorPaste paired x and y data to find r, the strength and direction of a linear relationship.Covariance CalculatorPaste paired x and y data to find the sample and population covariance measuring how two variables vary together.Standard Error of the Mean CalculatorPaste a data set or enter a standard deviation and sample size to find the standard error of the mean.Variance CalculatorPaste a data set to find the sample and population variance, plus standard deviation, mean and sum of squares.Coefficient of Variation CalculatorPaste a data set to find the CV, the standard deviation as a percent of the mean, for comparing spread.Five Number Summary CalculatorPaste a data set to get the minimum, first quartile, median, third quartile and maximum at a glance.Interquartile Range CalculatorPaste a data set to find the IQR along with the first and third quartiles and the median in one step.Outlier Detector (1.5 IQR)Free outlier detector using the 1.5 IQR rule. Paste a data set to find outliers, the fence boundaries and the clean values that remain.Geometric Mean CalculatorPaste positive numbers to find their geometric mean, the right average for growth rates, ratios and returns.Harmonic Mean CalculatorPaste positive numbers to find their harmonic mean, the correct average for rates like speed and price ratios.Weighted Mean CalculatorEnter values and their weights to find the weighted average, where more important items count for more.Normal Distribution CalculatorEnter a value, mean and standard deviation to find the probability density and cumulative probability.Binomial Probability CalculatorEnter trials, successes and success probability to find exact, at most and at least binomial probabilities.Poisson Probability CalculatorEnter an average rate and a count to find exact, at most and at least Poisson probabilities for rare events.Relative Frequency CalculatorPaste category counts to build a frequency table with relative and cumulative frequencies as percentages.

Frequently asked questions

Are these tools free?

Yes. Every tool in this toolkit is completely free, with no sign-up and no usage limits.

Do these tools work on mobile?

Yes. They run in any modern web browser on phone, tablet or desktop, with nothing to install.

Is my data private?

Yes. These tools run entirely in your browser, so nothing you enter is uploaded to a server.

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