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Free online sequences & series calculators. Fast, accurate, and always free to use.
Use our free arithmetic sequence calculator to find the nth term aₙ, common difference d, determine n from aₙ, and generate the sequence — all with step-by-step breakdown.
Use our free arithmetic series calculator to find Sₙ (sum of the first n terms), sum from term m to n, or determine n from a target sum.
Use our free geometric sequence calculator to find the nth term aₙ, common ratio r, determine n from aₙ, and generate the sequence.
Use our free geometric series calculator to find the finite sum Sₙ, the infinite sum S∞ (when |r| < 1), or the sum from term m to n.
Use our free harmonic series calculator to compute partial sums Hₙ = 1 + 1/2 + ... + 1/n, generalized harmonic series Σ1/i^k, and see the approximation ln(n)+γ.
Use our free Fibonacci sequence calculator to generate Fibonacci numbers with custom initial values (F₀, F₁), view the sequence, and compute the sum of the first n terms.
Use our free recursive sequence calculator to generate terms from a linear recurrence aₙ = c₁aₙ₋₁ + c₂aₙ₋₂ + ... with custom initial values and coefficients.
Use our free sigma notation calculator to evaluate Σ expressions: linear, quadratic, geometric, and power sums with custom bounds.
Addition, subtraction, multiplication, and division calculators.
Simplify, compare, and calculate with fractions.
Decimal conversion, rounding, and arithmetic calculators.
Calculate powers, square roots, and nth roots.
Solve equations, inequalities, and algebraic expressions.
Area, volume, perimeter, and shape calculators.
Sine, cosine, tangent, and trigonometric functions.
Mean, median, mode, standard deviation, and more.
Prime numbers, factorization, factors, multiples, and LCM calculators.
Binary, decimal, and hexadecimal converters and arithmetic.
Matrix operations, determinants, and inverses.
Derivatives, integrals, and limits calculators.
Complex number arithmetic and conversions.
Vector operations, eigenvalues, and linear systems.
Round numbers to specified precision and significant figures.
Odd math tools and general-purpose calculators.