Percentages, fractions, algebra and everyday math made fast.
Calculators in this category
Percentage Calculator — Find X% of a number, what percent X is of Y, or the change between two values.
Fraction Calculator — Add, subtract, multiply, and divide fractions with step-by-step simplification and mixed number conversions.
Scientific Calculator — Compute powers, square roots, logarithms, trigonometric functions, and factorials with instant scientific notation.
Quadratic Formula Calculator — Solve quadratic equations ax² + bx + c = 0 to find real or complex roots, discriminant, and parabola vertex.
Triangle Calculator — Solve any triangle from sides or angles using SSS, SAS, ASA, or AAS — area, perimeter, angles and heights.
Right Triangle Calculator — Solve a right triangle from any two known values — legs, hypotenuse, or an angle — using the Pythagorean theorem.
Area Calculator — Calculate the area and perimeter of rectangles, squares, circles, triangles, trapezoids, ellipses and parallelograms.
Circle Calculator — Calculate radius, diameter, circumference, and area from any one circle measurement, plus arc length and sector area.
Volume Calculator — Calculate volume and total surface area for spheres, cylinders, cones, cubes, rectangular prisms, pyramids and capsules.
Surface Area Calculator — Calculate total, lateral and base surface areas for spheres, cylinders, cones, cubes, rectangular prisms and tori.
Distance Calculator — Calculate distance between two 2D or 3D coordinate points, find the midpoint and slope, or solve speed-distance-time problems.
Exponent Calculator — Calculate bᵉ for any base and exponent — positive, negative, or fractional — with scientific notation and exponent rules.
Log Calculator — Calculate common log (log₁₀), natural log (ln), binary log (log₂) and any custom base logarithm for any positive number.
Root Calculator — Calculate square roots, cube roots, and any nth root for positive or negative radicands with step-by-step verification.
Slope Calculator — Find the slope, y-intercept, line equation, angle of inclination and perpendicular slope from two coordinate points.
Scientific Notation Calculator — Convert any number to scientific notation and perform arithmetic (add, subtract, multiply, divide) on numbers in scientific notation.
Half-Life Calculator — Calculate the remaining quantity after radioactive decay, find the half-life from measurements, or determine how long decay takes.
Percent Error Calculator — Calculate percent error between an experimental and accepted value to assess measurement accuracy in lab reports.
Ratio Calculator — Simplify ratios, solve proportions (A/B = C/D), and divide a total amount in a given ratio.
Rounding Calculator — Round any number to a specified number of decimal places using standard, floor, ceiling, or truncation rounding.
Long Division Calculator — Perform integer long division with remainder, mixed number result, and step-by-step verification.
Factor Calculator — Find all factors, factor pairs, prime factorization, and check if a number is prime for any positive integer.
GCF Calculator — Find the Greatest Common Factor (GCF/GCD) and all common factors of two or more integers using the Euclidean algorithm.
LCM Calculator — Find the Least Common Multiple (LCM) of two or more integers to solve fraction addition and scheduling problems.
Binary Calculator — Convert binary numbers to decimal, hexadecimal, and octal — or perform binary arithmetic (add, subtract, multiply, divide).
Hex Calculator — Convert hexadecimal to decimal, binary, and octal — or perform arithmetic on hex values, with RGB color interpretation.
Number Sequence Calculator — Find the nth term and sum of arithmetic or geometric sequences, with sequence preview and sum-to-infinity for convergent series.
Random Number Generator — Generate random integers or decimals within any range, with optional uniqueness, sorting, and descriptive statistics.
Matrix Calculator — Calculate matrix determinants, inverses, transposes, and perform matrix addition, subtraction, and multiplication for 2×2 and 3×3 matrices.
Permutation and Combination Calculator — Calculate permutations P(n,r) and combinations C(n,r) for ordered and unordered selection, with and without repetition.
Mean, Median, Mode, Range Calculator — Calculate mean (average), median, mode, and range for any dataset — the four pillars of descriptive statistics.
Standard Deviation Calculator — Calculate sample and population standard deviation, variance, standard error, and coefficient of variation for any dataset.
Statistics Calculator — Full descriptive statistics: five-number summary, IQR, mean, variance, standard deviation, and skewness for any dataset.
Probability Calculator — Calculate basic probability, complement, odds, and combined probability of two events (AND, OR) for any scenario.
Z-score Calculator — Convert a raw score to a Z-score (standard score), find its percentile, and compute cumulative probability under the normal distribution.
Confidence Interval Calculator — Calculate confidence intervals for a sample mean or proportion at 80%, 90%, 95%, 98%, or 99% confidence levels.
Sample Size Calculator — Determine the minimum sample size needed for a survey or study based on margin of error, confidence level, and population size.
P-value Calculator — Calculate the P-value from a Z-statistic for one-tailed or two-tailed hypothesis tests and determine statistical significance.
About our math calculators
Everyday math should take seconds. The percentage calculator answers the three classics — what is X% of Y, X is what percent of Y, and percentage change between two values — with the calculation written out step by step.
Our comprehensive suite includes fraction calculators, quadratic solvers, matrix solvers, statistics tools, and geometric converters. Every tool follows the same rule: show the answer instantly, then explain the exact method.
Frequently asked questions
How do CalcsKit math calculators explain step-by-step solutions?
In addition to providing instant numerical answers, each math tool displays the underlying mathematical formula and a step-by-step worked example so you can verify the solution step by step.
Can I share my exact calculation results?
Yes. Click the Share button on any calculator page to generate a unique URL pre-filled with your exact numbers and parameters.