Free Math & Statistics Calculators
Arithmetic, algebra, geometry, trigonometry and statistics — each one showing the working with your own numbers substituted, not just the answer.
- 115 free tools
- No signup
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- Runs in your browser
A 9 tools
Absolute Value Equation Calculator
Solve absolute value equations and see both branches, or why there is no solution.
Adding Fractions Calculator
Add two or three fractions or mixed numbers with every step of the working shown.
ANOVA Calculator
Run one-way ANOVA on three or more groups and read the complete results table.
APA Citation Generator
Generate a correctly formatted APA 7th edition reference and in-text citation.
Arc Length Calculator
Enter a radius and central angle in degrees or radians to get the exact arc length.
Arccos Calculator
Find the angle whose cosine is a given value, including obtuse results.
Arcsin Calculator
Find the angle whose sine is a given value, with exact results and domain checks.
Arctan Calculator
Find the angle whose tangent is any real number, plus two-argument atan2.
Arithmetic Sequence Calculator
Find any term of an arithmetic sequence, the sum of its terms, and where a value sits in it.
B 2 tools
C 16 tools
CGPA Calculator
Calculate your cumulative GPA across multiple semesters and convert CGPA to a percentage.
Chi-Square Calculator
Test a contingency table for independence or compare observed counts with expected ones.
Circle Calculator
Enter any one measurement of a circle and get the radius, diameter, circumference and area.
Coefficient of Variation Calculator
Work out the coefficient of variation to compare spread across different units or scales.
Completing the Square Calculator
Turn a quadratic into vertex form and see every line of the working written out.
Complex Number Calculator
Add, subtract, multiply or divide complex numbers with modulus and polar form shown.
Cone Calculator
Cone volume, slant height, lateral area and total surface area from radius or diameter.
Confidence Interval Calculator
Build a confidence interval for a mean or proportion with exact t and z critical values.
Correlation Coefficient Calculator
Calculate Pearson r and Spearman rho from paired data, with r-squared and a p-value.
Coterminal Angle Calculator
Find every angle sharing a terminal side, positive and negative, in either unit.
Covariance Calculator
Calculate sample and population covariance from paired data, with the working shown.
Cross Multiplication Calculator
Find the missing term in any proportion, with the cross-multiplied working shown.
Cube Calculator
Find cube volume, surface area and both diagonals from an edge, volume or diagonal.
Cube Root Calculator
Find the real cube root of any number, negatives included, with the simplified exact form shown.
Cubic Equation Calculator
Solve any cubic equation and see all three roots with the depressed cubic working shown.
Cylinder Volume Calculator
Find the volume, capacity and surface area of a cylinder from its diameter or radius and height.
D 5 tools
Decimal to Fraction Calculator
Convert terminating and repeating decimals into exact fractions with the algebra shown.
Digit Sum Calculator
Add the digits of any number, reduce it to its digital root, and test divisibility.
Discriminant Calculator
Find the discriminant of a quadratic and read off the exact nature of its roots.
Dividing Fractions Calculator
Divide fractions and mixed numbers and see the reciprocal step that makes it work.
Double Angle Calculator
Apply the double angle identities and compare all three forms of cos 2 theta.
E 5 tools
Ellipse Calculator
Enter semi-axes or full axes to get the exact area plus a high-accuracy circumference.
Ellipsoid Volume Calculator
Exact ellipsoid volume from three semi-axes, plus surface area with its accuracy stated.
Equivalent Fractions Calculator
List fractions equal to yours, find the simplest form, and test two for equivalence.
Exam Countdown Timer
A live-ticking countdown to your exam with real study-days remaining and milestones.
Exponent Calculator
Raise any base to any power, including zero, negative and fractional exponents, with the working shown.
F 6 tools
Factorial Calculator
Compute n! exactly (BigInt for large n), plus nPr permutations and nCr combinations.
Factoring Trinomials Calculator
Factor ax2 + bx + c into two binomials with every factor pair tested shown.
Fibonacci Calculator
Find any Fibonacci number exactly with BigInt, list the sequence, and see the ratio.
Final Grade Calculator
Find the exact final exam score you need to hit your target course grade.
Five Number Summary Calculator
Get the minimum, Q1, median, Q3 and maximum, drawn as a box plot you can read.
Fraction Calculator
Add, subtract, multiply, or divide two fractions with simplified, mixed, and decimal results.
G 3 tools
Geometric Mean Calculator
The right average when your numbers multiply rather than add, with the working shown.
GPA Calculator
Add courses with letter grades and credit hours to instantly calculate your weighted GPA.
Grade Curve Calculator
Apply flat, square-root, top-score, or target-mean curves to a class and compare before/after.
H 3 tools
Harmonic Mean Calculator
The correct average for speeds, rates and ratios, with the reciprocal working shown.
Hemisphere Volume Calculator
Hemisphere volume, curved area and true total surface area including the flat face.
Hexagon Calculator
Solve a regular hexagon from the side, the across-flats width or the across-corners width.
I 2 tools
L 6 tools
Law of Cosines Calculator
Solve a triangle from three sides or two sides and the included angle.
Law of Sines Calculator
Solve AAS, ASA and SSA triangles, including both answers in the ambiguous case.
LCM & GCF Calculator
Find LCM and GCF/HCF of 2+ numbers with prime-factorization and Euclidean algorithm steps.
Linear Regression Calculator
Fit a least-squares line and get slope, intercept, r, r-squared and the standard error.
Logarithm Calculator
Find the logarithm of any number in any base, with natural, common and binary logs shown together.
Long Division Calculator
Divide any two numbers and see the full long division layout, not just the answer.
M 6 tools
Margin of Error Calculator
Calculate the margin of error for a survey result and the sample size a tighter one needs.
Mean Median Mode Calculator
Find the mean, median, mode, range, and sorted order of any number list instantly.
Mixed Number Calculator
Convert between mixed numbers, improper fractions, and decimals in both directions.
MLA Citation Generator
Generate a correctly formatted MLA 9th edition Works Cited entry and in-text citation.
Modulo Calculator
Calculate a mod n with negative operands handled under all three conventions.
Multiplying Fractions Calculator
Multiply fractions and mixed numbers with cross-cancelling and the full working shown.
N 1 tool
O 1 tool
P 14 tools
P-Value Calculator
Convert a z, t, chi-square or F statistic into an exact p-value and critical value.
Pentagon Calculator
Solve a regular pentagon from the side, apothem, circumradius, diagonal or overall height.
Percent Error Calculator
Compare an experimental measurement against the true value and see the error in full.
Percentage Change Calculator
Work out the percentage increase or decrease between two values, and the change needed to reverse it.
Percentile Calculator
Find the value at any percentile or the percentile rank of a value, plus quartiles and IQR.
Perimeter Calculator
Find the distance round a rectangle, square, triangle, circle, ellipse or regular polygon.
Poisson Distribution Calculator
Work out Poisson probabilities for a given rate, including both cumulative tails.
Polygon Calculator
Solve any regular polygon from one measurement, or an irregular outline from its corners.
Polynomial Division Calculator
Divide one polynomial by another and see the full long division layout at each stage.
Prime Factorization Calculator
Break any whole number into prime factors with a factor tree and exponent form.
Prime Number Checker
Test if a number is prime, see its prime factorization, and list primes in a range.
Probability Calculator
Calculate single-event, complement, independent and/or, conditional probability, and odds conversions.
Pyramid Volume Calculator
Volume, slant height and surface area for square, rectangular and polygon pyramids.
Pythagorean Theorem Calculator
Solve for any missing right-triangle side, verify triples, and get area, perimeter, and angles.
Q 2 tools
R 8 tools
Ratio Calculator
Simplify a ratio, solve a proportion, scale a ratio, or convert it to a fraction/percentage.
Rectangle Area Calculator
Enter a length and a width in any unit and get area, perimeter, diagonal and aspect ratio.
Rectangular Prism Calculator
Volume, surface area and space diagonal of any box shape, plus capacity in litres.
Reference Angle Calculator
Reduce any angle to its acute reference angle and see the quadrant sign rule.
Relative Frequency Calculator
Turn raw counts into relative frequencies, percentages and a cumulative distribution.
Remainder Calculator
Get the remainder and whole quotient for any division, with the check shown in full.
Root Mean Square Calculator
Enter any set of values and get the RMS with every squared term written out.
Rounding Calculator
Round any number three different ways and see how the tie-breaking rules disagree.
S 13 tools
Scientific Calculator
Full scientific calculator: trig, logs, powers, roots, factorials, and memory, right in your browser.
Scientific Notation Converter
Convert numbers between standard, scientific, E-notation, and engineering notation.
Sector Area Calculator
Enter a radius and an angle to get sector area, arc length, chord and segment area.
Semester Grade Calculator
See your weighted running semester grade and what score you need on what's left.
Significant Figures Calculator
Count sig figs, round to N sig figs, and do sig-fig-correct addition, subtraction, multiplication, and division.
Simplify Fractions Calculator
Reduce any fraction to lowest terms with the greatest common divisor shown in full.
Slope Calculator
Find slope, y-intercept, distance, midpoint, and the line equation from two points, with steps.
Sphere Volume Calculator
Find the volume and surface area of a sphere from its radius, diameter, surface area or volume.
Square Root Calculator
Find the square root of any number as a decimal and as an exact simplified radical form.
Standard Deviation Calculator
Get sample and population standard deviation, variance, and a full step-by-step working table.
Study Time Planner
Turn your exam list into a daily study schedule based on difficulty and confidence.
Surface Area Calculator
Total and lateral surface area for a cube, box, cylinder, cone, sphere or pyramid.
System of Equations Calculator
Solve two or three simultaneous linear equations with the full elimination working.
T 7 tools
T-Test Calculator
Run one-sample, two-sample or paired t-tests on your data with exact p-values and effect size.
Tetrahedron Volume Calculator
Regular tetrahedron volume, surface area and height from an edge, volume or area.
Torus Volume Calculator
Torus volume and surface area from two radii or from inner and outer diameters.
Trapezoid Calculator
Work out the area, perimeter, height and midsegment of a trapezoid from what you have.
Triangle Area Calculator
Find the area of any triangle from a base and height, three sides, or two sides and an angle.
Triangular Prism Calculator
Volume, base area, lateral area and total surface area of a triangular prism, from three sides.
Trigonometric Functions Calculator
Find sin, cos, tan, csc, sec and cot for any angle in degrees or radians.
U 1 tool
V 1 tool
W 3 tools
Weighted Average Calculator
Work out a weighted mean when some numbers count for more than others.
Weighted Grade Calculator
Enter category weights and scores to instantly see your weighted overall course grade.
Words Per Page Calculator
Convert word counts to pages (or pages to words) by font, size, spacing, and margins.
Z 1 tool
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Built to show the method
An answer alone teaches nothing and cannot be checked. Every calculator in this set prints the substituted formula: the long-division layout digit by digit, the completed square line by line, the least common denominator before the fractions are added, each squared term before the root is taken. If the result looks wrong you can see exactly where it came from.
Edge cases are handled, not hidden
The cube root of a negative number is real; the square root is not. Zero to the power zero is defined as one by convention, and the convention is stated. A percentage change from zero is undefined rather than infinite. Absolute-value equations have no solution when the isolated value is negative, and exactly one when it is zero. These are the cases where most online calculators quietly return the wrong thing or an error code.
Statistics with the assumptions on screen
Sample and population are different divisors and give different answers, so the statistics tools make you choose rather than assuming. One-tailed and two-tailed tests are a visible switch. The three common quartile methods genuinely disagree on the same data, so the quartile tools show all three side by side instead of picking one silently.
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