Tools
Calculators for the math school keeps asking you to do: your GPA and grades, equations and statistics, physics and chemistry. Enter your numbers and get the answer right away, with how it was worked out.
Grades & School
9 ToolsGPA Calculator
Find your semester or cumulative GPA from your course grades and credit hours, on the 4.0 scale.Final / Weighted Grade Calculator
Find your overall grade in a class from weighted categories like homework, quizzes and exams.Final Exam Grade Calculator
Find the score you need on your final exam to end the class with the grade you want.Test Score Calculator
Find how many questions you can miss on a test and still get the score you need.Grading Curve Calculator
Curve a class's test scores with a flat, square root or target-average curve and see every new score and the new class average.Class Attendance Calculator
Find your attendance percentage and how many more classes you can miss under your class's attendance policy.Degree Credit Progress Calculator
See how far along your degree you are, when you'll finish at your pace, or how many credits a term you need to graduate on time.SAT Score Calculator
Add your Reading and Writing and Math scores into your SAT total and see how it compares with other recent test takers.ACT Score Calculator
Work out your ACT Composite from your English, Math and Reading scores, see its national rank, and get your STEM score if you took Science.
Math
10 ToolsPercentage Calculator
Answer any everyday percentage question: a percent of a number, what percent one number is of another, the whole from a part, percent change and percent difference.Scientific Calculator
A free online scientific calculator: trig in degrees or radians, powers, roots, logs, factorials and π, typed or tapped, with your recent answers kept.Fraction Calculator
Add, subtract, multiply and divide fractions and mixed numbers, get the answer in lowest terms, or turn a decimal into a fraction.Quadratic Formula Calculator
Solve any quadratic equation ax² + bx + c = 0, including complex roots, and see the discriminant and the parabola's vertex.Statistics Calculator
Paste a list of numbers to get the mean, median, mode, range, quartiles, standard deviation and variance, with the five-number summary for box plots.Scientific Notation Calculator
Convert a number to scientific notation or back to standard form, with the E notation calculators use.Logarithm Calculator
Find the logarithm of any number in any base, including natural log and log base 2, or work backward with the antilog.Distance, Midpoint and Slope Calculator
From two points, find the distance between them (with its exact radical), the midpoint, the slope as a fraction and the equation of the line.Triangle Calculator
Solve any triangle from three of its sides and angles, including the SSA ambiguous case, and get every side, angle, the perimeter and the area.Unit Converter
Convert length, weight, volume, temperature, area, speed, time, data, pressure, energy, power and angles, with the value in every unit at once.
Science & Engineering
11 ToolsOhm's Law Calculator
Find voltage, current or resistance from the other two with Ohm's law, plus the power used.Density Calculator
Find density, mass or volume from the other two in any units, and see whether the object would float or sink in water.Speed, Distance and Time Calculator
Find speed, distance or travel time from the other two, in any units, with the time also shown in hours, minutes and seconds.Force Calculator (F = ma)
Use Newton's second law to find force, mass or acceleration from the other two, in any units, with the mass's weight on Earth for comparison.Kinetic and Potential Energy Calculator
Work out kinetic energy (½mv²) or gravitational potential energy (mgh) in any units, and see the height or speed the same energy is worth.Projectile Motion Calculator
Find a projectile's range, time of flight, maximum height and landing speed from its launch speed, angle and height, with no air resistance.Molarity and Dilution Calculator
Find molarity, moles or volume from the other two, or work out a dilution: how much stock solution and how much water you need.Molar Mass Calculator
Type a chemical formula to get its molar mass, each element's share by mass, and how many moles a given mass is. Handles groups and hydrates.Ideal Gas Law Calculator (PV = nRT)
Solve PV = nRT for pressure, volume, moles or temperature in any units, with the gas constant and temperature conversions handled for you.pH Calculator
Find pH, pOH, [H⁺] and [OH⁻] from any one of them, see whether a solution is acidic, neutral or basic, and where it sits on the pH scale.Wavelength and Frequency Calculator
Convert between wavelength and frequency for light, sound or any wave, find the wave speed, and get the period and a light wave's photon energy.
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