How to Use a Scientific Calculator: Functions, Angles, and Expression Order
Understand scientific-calculator functions, radians and degrees, exponents, logarithms, factorials, memory, and the checks that prevent an apparently plausible wrong answer.
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Math Calculators
Browse all 45 calculators in this category.
45 math calculators for geometry, algebra, statistics, probability, number theory, percentages, fractions, and education.
Solve problems quickly with 45 math tools. Find area and volume, solve equations, calculate standard deviation, probabilities and permutations, or explore common factors and prime factorization. Percentages, fractions, exponents, logarithms and scientific functions are all here.
Significant Figures Calculator
Count sig figs with digit explanations or round to significant figures, including scientific notation and ambiguous zeros.
Scientific Calculator
Advanced math calculator online
Percentage Calculator
Calculate percentages quickly
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step solutions.
Random Number Generator
Generate random numbers within a specified range for games, simulations, and more.
Area Calculator
Area of circles, triangles, rectangles & more
Circle Calculator
Given any one value (radius, diameter, area, or circumference), solve for all other circle properties.
Pythagorean Theorem Calculator
Given any two sides of a right triangle, solve for the third using the Pythagorean theorem c²=a²+b².
Right Triangle Calculator
Solve a right triangle from any two known values (sides or angles) using trigonometry and the Pythagorean theorem.
Triangle Calculator
Solve any triangle from SSS, SAS, ASA, AAS, or SSA inputs using the Law of Sines and Law of Cosines.
Distance Calculator
Calculate the distance between two points in 2D or 3D space, plus midpoint and slope.
Slope Calculator
Calculate slope, y-intercept, line equation, and angle of inclination from two points.
Ratio Calculator
Simplify ratios, solve for missing values in proportions, or scale a ratio by a factor.
Volume Calculator
Calculate the volume of spheres, cylinders, cones, cubes, prisms, pyramids, and more with unit conversion.
Surface Area Calculator
Calculate total and lateral surface area for 3D shapes including spheres, cylinders, cones, and prisms.
Quadratic Formula Calculator
Solve ax²+bx+c=0 with the quadratic formula. Find real and complex roots, discriminant, vertex, and factored form.
Exponent Calculator
Calculate b^n for any base and exponent, including negative and fractional exponents with step-by-step working.
Root Calculator
Calculate the nth root of any number, including square roots, cube roots, and arbitrary roots with full working.
Log Calculator
Calculate logarithms in any base — natural log (ln), log base 10, log base 2, or custom base.
Scientific Notation Calculator
Convert between standard and scientific notation. Perform arithmetic on numbers in scientific notation.
Factor Calculator
Find all factors, factor pairs, and prime factorization of any positive integer.
Prime Factorization Calculator
Break any integer into its prime factors. Shows exponential form, factor tree, and number of divisors.
LCM Calculator
Calculate the Least Common Multiple of up to 10 numbers with step-by-step prime factorization.
GCF Calculator
Calculate the Greatest Common Factor of up to 10 numbers using the Euclidean algorithm.
Rounding Calculator
Round numbers using 6 modes: half up, half down, banker's rounding, truncate, ceiling, and floor.
Percent Error Calculator
Calculate absolute error, relative error, and percent error between measured and actual values.
Average Calculator
Calculate mean, median, mode, range, min, max, sum, and count from a list of numbers.
Long Division Calculator
Perform integer long division with a full step-by-step walkthrough of each bring-down, multiply, and subtract step.
Big Number Calculator
Add, subtract, and multiply arbitrarily large integers using JavaScript BigInt. Perfect for 100+ digit numbers.
Basic Calculator
A clean, functional pocket calculator with keyboard support. Perfect for quick everyday arithmetic.
Number Sequence Calculator
Calculate the nth term, sum, and list of terms for arithmetic and geometric sequences.
Binary Calculator
Convert between binary, decimal, octal, and hexadecimal. Perform binary arithmetic with step-by-step working.
Hex Calculator
Convert between hexadecimal, decimal, binary, and octal. Perform arithmetic on hex numbers.
Half-Life Calculator
Calculate remaining quantity, half-life, or time elapsed for radioactive decay and exponential processes.
Matrix Calculator
Add, subtract, multiply 2×2 and 3×3 matrices. Find determinant, inverse, and transpose with step-by-step working.
Standard Deviation Calculator
Mean, variance & standard deviation
Statistics Calculator
Full descriptive statistics: mean, median, mode, quartiles, IQR, skewness, standard error, and more.
Mean, Median, Mode, Range Calculator
Calculate mean, median, mode, and range with step-by-step working. Great for students.
Sample Size Calculator
Calculate the required sample size for a given confidence level, expected proportion, and margin of error.
Probability Calculator
Calculate probabilities for single events, two independent events, and conditional probability.
Permutation and Combination Calculator
Calculate P(n,r) permutations and C(n,r) combinations with factorial working and Pascal's triangle.
Z-Score Calculator
Convert values to z-scores and percentiles, or find the percentile for any z-score using the standard normal distribution.
Confidence Interval Calculator
Calculate confidence intervals for a population mean using Z or t critical values at 90%, 95%, or 99%.
P-Value Calculator
Calculate p-values from Z-test or T-test statistics. Determine significance at α=0.05 and α=0.01.
CGPA to Percentage Calculator
Compare country-specific CGPA, GPA, percentage, and degree-mark systems for India, Pakistan, the US, Canada, UK, Australia, France, and Italy.
Guides and explanations
Explore practical examples and the reasoning behind these calculations.
Understanding Standard Deviation and Why It Matters
Standard deviation measures the spread of a data set—but most explanations stop there. This guide walks through the full calculation, the difference between population and sample formulas, the empirical rule, and practical uses in quality control, finance, and polling.
Binary and Hexadecimal Explained: A Beginner's Guide
Computers speak in ones and zeros, but why? This guide explains positional notation, walks through binary-to-decimal and decimal-to-binary conversions step by step, shows why hexadecimal exists, and covers practical uses like memory addresses, RGB color codes, and Unix file permissions.
How to Solve Any Triangle: Law of Sines vs. Law of Cosines
A triangle has six elements—three sides and three angles—and knowing just three is enough to find the rest. This guide shows when to use the Law of Sines versus the Law of Cosines, explains the ambiguous SSA case, and walks through worked examples for every scenario.
A Practical Guide to Statistical Sample Size: How Many People Do You Actually Need to Survey?
Determining the right survey sample size comes down to four inputs: confidence level, margin of error, population proportion, and population size. This guide explains each factor, shows why huge populations need surprisingly modest samples, and applies the math to real-world polling and A/B testing.
Matrix Operations Explained Simply: Addition, Multiplication, and the Determinant
Matrices power everything from 3D graphics to machine learning—but the operations themselves are approachable once you see the pattern. This guide covers matrix addition, scalar multiplication, matrix multiplication (and why order matters), the determinant, and why a zero determinant means trouble.