Math calculators

Everyday arithmetic, algebra, and geometry — worked out clearly.

Percentages, fractions, ratios, geometry, and the little calculations that come up all the time — with formulas you can reuse anywhere.

Calculators

244

Topics: All Percentage (75) Fractions (4) Geometry (63)

Math

Geometric Series Sum and Nth Term Calculator

Calculates the nth term, finite sum, and infinite sum of a geometric series from the first term a and common ratio r. In...

basic

18,811 4.1 1 min

Math

Simpson's Rule Composite Integral Calculator

Approximates a definite integral using the composite Simpson's 1/3 rule from a table of function values at equally-space...

basic

9,756 3.9 1 min

Math / Percentage

Infinite Geometric Series Convergence Sum Calculator

Calculates the sum of an infinite geometric series S = a/(1−r) for |r| < 1, and the finite partial sum S_n = a(1−r^n)/(1...

basic

7,841 4.5 1 min

Math / Percentage

Exponential Growth and Decay Rate Calculator

Computes y(t) = y₀ · e^(r·t) for continuous exponential growth (r > 0) or decay (r < 0). Also calculates the doubling ti...

basic

22,084 4.0 1 min

Math

Continued Fraction First Convergents Calculator

Computes the first two convergents of a continued fraction from three partial quotients. Convergents are the best ration...

basic

18,153 4.4 1 min

Math

Trapezoidal Rule Definite Integral Calculator

Approximates a definite integral using the composite trapezoidal rule from up to five equally-spaced function values.

basic

17,617 3.9 1 min

Math / Percentage

Number of Divisors from Prime Factorisation Calculator

Calculates the number of positive divisors of n = p₁^e₁ × p₂^e₂ × … as d(n) = (e₁+1)(e₂+1)…. For small n, also computes...

basic

14,074 4.1 1 min

Math / Percentage

Euler's Totient Function φ(n) Calculator

Calculates Euler's totient φ(n) = n × Π(1 − 1/p) for each distinct prime p dividing n. Used in RSA encryption and modula...

basic

21,578 4.8 1 min

Math / Percentage

Logistic Population Growth at Time t Calculator

Calculates population P(t) using the logistic growth model with carrying capacity K, initial population P₀, and growth r...

basic

6,926 4.3 1 min

Math

Complex Number Polar Form Converter

Converts a complex number from rectangular form (a + bi) to polar form (r∠θ). Also computes the complex conjugate and mo...

basic

4,141 4.8 1 min

Math / Percentage

Fast Modular Exponentiation Calculator

Calculates a^e mod m using repeated squaring. Essential for RSA, Diffie-Hellman, and primality tests. Works for large va...

basic

7,958 4.1 1 min

Math

Cross Product Magnitude and Direction from Two Vectors Calculator

Calculates the cross product (scalar magnitude for 2-D vectors) and the angle between two 2-D vectors. The parallelogram...

basic

1,125 4.5 1 min

Math

Cramer's Rule 2×2 Linear System Calculator

Solves a system of two linear equations ax+by=e, cx+dy=f using Cramer's Rule. Computes the main determinant D and soluti...

basic

20,649 4.2 1 min

Math / Percentage

Integer Prime Factorisation Calculator

For integers up to ~10^6, determines whether n is prime and outputs the prime factorisation as p₁^e₁ × p₂^e₂ … by trial...

basic

13,276 4.5 1 min

Math

Vieta Formulas Sum and Product of Roots Calculator

Calculates the sum, product, and discriminant of the roots of a quadratic equation ax²+bx+c=0 using Vieta's formulas, wi...

basic

21,650 3.9 1 min

Math / Percentage

Quadratic Formula Roots and Discriminant Calculator

Solves ax² + bx + c = 0 using the quadratic formula. Returns both roots, the discriminant Δ = b²−4ac (positive = 2 real,...

basic

17,300 4.2 1 min

Math

Absolute Percentage Error Calculator

Calculates the Absolute Percentage Error (APE) between a forecast and actual value, plus the mean APE (MAPE) if multiple...

basic

15,993 4.7 1 min

Math / Percentage

Permutations and Combinations Calculator

Calculates nPr = n!/(n−r)! (ordered arrangements) and nCr = n!/(r!(n−r)!) (unordered selections) for given n and r. Also...

basic

6,333 4.7 1 min

Math

Geometric Mean Growth Rate Calculator

Calculates the geometric mean of up to six positive values — the appropriate average for growth rates, ratios, and multi...

basic

5,342 4.0 1 min

Math / Percentage

Depressed Cubic (Cardano's Method) Real Root Calculator

Finds the real cube root of the depressed cubic x³ + px + q = 0 using Cardano's formula: x = ∛(−q/2 + √D) + ∛(−q/2 − √D)...

basic

755 4.2 1 min

Math

Harmonic Mean Series Circuit Calculator

Calculates the harmonic mean of up to six values — useful for averaging rates, speeds, and parallel circuit impedances.

basic

24,046 3.9 1 min

Math

Standard Error of Mean from Sample Calculator

Calculates the Standard Error of the Mean (SEM) from the sample standard deviation and sample size. Also gives the 95% c...

basic

11,889 4.5 1 min

Math / Percentage

Pythagorean Theorem: Hypotenuse or Missing Leg Calculator

Solves for the missing side of a right triangle: hypotenuse c = √(a²+b²), or leg a = √(c²−b²). Also computes the triangl...

basic

3,458 4.7 1 min

Math

Fibonacci Nth Term and Sum Calculator

Calculates the nth Fibonacci number using Binet's closed-form formula and the sum of the first n Fibonacci numbers (S_n...

basic

4,104 4.7 1 min

Showing 217 to 240 of 244 results

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Percentages, fractions, ratios, geometry, and the little calculations that come up all the time — with formulas you can reuse anywhere.

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Math calculators

Geometric Series Sum and Nth Term Calculator

Simpson's Rule Composite Integral Calculator

Infinite Geometric Series Convergence Sum Calculator

Exponential Growth and Decay Rate Calculator

Continued Fraction First Convergents Calculator

Trapezoidal Rule Definite Integral Calculator

Number of Divisors from Prime Factorisation Calculator

Euler's Totient Function φ(n) Calculator

Logistic Population Growth at Time t Calculator

Complex Number Polar Form Converter

Fast Modular Exponentiation Calculator

Cross Product Magnitude and Direction from Two Vectors Calculator

Cramer's Rule 2×2 Linear System Calculator

Integer Prime Factorisation Calculator

Vieta Formulas Sum and Product of Roots Calculator

Quadratic Formula Roots and Discriminant Calculator

Absolute Percentage Error Calculator

Permutations and Combinations Calculator

Geometric Mean Growth Rate Calculator

Depressed Cubic (Cardano's Method) Real Root Calculator

Harmonic Mean Series Circuit Calculator

Standard Error of Mean from Sample Calculator

Pythagorean Theorem: Hypotenuse or Missing Leg Calculator

Fibonacci Nth Term and Sum Calculator