Calculators
Math calculators
39 tools
Arithmetic, percentages, trigonometry, and more.
Browse by topic
Family pages are registry-driven. Calculator URLs stay /calc/math/…
- Basic Arithmetic Add, subtract, multiply, divide, fractions, and scientific notation. · 6 tools
- Powers, Roots & Logarithms Exponents, roots, log, ln, antilog, and exponential growth. · 7 tools
- Number Theory & Discrete Math GCF, LCM, factorial, permutations and combinations, Euclidean remainder, and prime factorization. · 6 tools
- Trigonometry & Triangles Sin, cos, tan, inverse trig, and the general triangle solver. · 8 tools
Popular
Featured tools from the Family registry.
- Sum Calculator Add a list of numbers (sum), see the mean, or work long addition with place-value steps. Paste values separated by commas, spaces, or new lines — decimals and negatives.
- Fractions Calculator Add, subtract, multiply, or divide fractions and mixed numbers with step-by-step LCD work. Free online tool — no sign-up. Runs locally in your browser.
- Scientific Notation Calculator Convert numbers to scientific, E, and engineering notation. Free online tool — no sign-up. Mobile-friendly and privacy-first. Runs locally in your browser.
- Percentage Calculator Calculate percentages, percentage of a number, and “what percent is X of Y” with clear arithmetic steps. Runs locally in your browser. Try it free.
- Ratio Calculator Simplify ratios and scale quantities that stay in proportion. Runs locally in your browser. Free online tool — no sign-up. No account needed.
- Log Calculator Evaluate logarithms (common, natural, or arbitrary base) for x > 0. Fast local calculation with shareable, machine-readable results.
- Exponent Calculator Calculate aⁿ for a real base and exponent. Fast local calculation with shareable, machine-readable results.
- Square Root Calculator Calculate the principal square root √x. Fast local calculation with shareable, machine-readable results.
Basic Arithmetic
Add, subtract, multiply, divide, fractions, and scientific notation.
- Division Calculator Divide numbers with quotient, remainder, and decimal results for quick arithmetic checks. Runs locally in your browser. Free online tool — no sign-up.
- Fractions Calculator Add, subtract, multiply, or divide fractions and mixed numbers with step-by-step LCD work. Free online tool — no sign-up. Runs locally in your browser.
- Multiplication Calculator Multiply two numbers instantly, or see long multiplication with partial products, carrying, decimals, and sign rules. Runs locally in your browser.
- Scientific Notation Calculator Convert numbers to scientific, E, and engineering notation. Free online tool — no sign-up. Mobile-friendly and privacy-first. Runs locally in your browser.
- Subtraction Calculator Subtract minuend − subtrahend to get the difference. Free online tool — no sign-up. Clear formulas and worked examples. Interactive calculations run locally in your browser.
- Sum Calculator Add a list of numbers (sum), see the mean, or work long addition with place-value steps. Paste values separated by commas, spaces, or new lines — decimals and negatives.
Percent, Ratio & Proportion
Percentage, percent change, percent error, and ratios.
- Percent Error Calculator Compute percent error between experimental and accepted values for lab and measurement checks. Interactive calculations run locally; shared URLs and REST use the same engine. Free — no sign-up.
- Percentage Calculator Calculate percentages, percentage of a number, and “what percent is X of Y” with clear arithmetic steps. Runs locally in your browser. Try it free.
- Percentage Change Calculator Calculate the percentage increase or decrease from an initial value to a final value. You can also solve for the initial or final value. Free online — no sign-up.
- Ratio Calculator Simplify ratios and scale quantities that stay in proportion. Runs locally in your browser. Free online tool — no sign-up. No account needed.
Powers, Roots & Logarithms
Exponents, roots, log, ln, antilog, and exponential growth.
- Antilog Calculator Calculate the antilogarithm: raise base b to power y. Fast local calculation with shareable, machine-readable results.
- Exponent Calculator Calculate aⁿ for a real base and exponent. Fast local calculation with shareable, machine-readable results.
- Exponential Growth Calculator Model exponential growth or decay from initial value, rate, and time. Runs locally in your browser. Free online tool — no sign-up. Try it free.
- Log Calculator Evaluate logarithms (common, natural, or arbitrary base) for x > 0. Fast local calculation with shareable, machine-readable results.
- Natural Log (ln) Calculator Calculate ln(x) = log_e(x) for x > 0. Fast local calculation with shareable, machine-readable results.
- Root Calculator Calculate the principal real nth root ⁿ√a. Fast local calculation with shareable, machine-readable results.
- Square Root Calculator Calculate the principal square root √x. Fast local calculation with shareable, machine-readable results.
Number Theory & Discrete Math
GCF, LCM, factorial, permutations and combinations, Euclidean remainder, and prime factorization.
- Factorial Calculator Calculate n! for integers 0 ≤ n ≤ 5000. Fast local exact integers with shareable, machine-readable results.
- GCF Calculator Find the GCF, GCD, or HCF of two or more integers. Exact BigInt Euclidean fold with factor and prime cross-checks. Free, no sign-up.
- LCM Calculator Find the LCM of two or more integers with exact arithmetic and independent verification. Free, no sign-up.
- Modulo Calculator Integer remainder with a = q·m + r and 0 ≤ r < |m|. Euclidean convention, not JavaScript truncated %.
- Permutation Combination Calculator Exact P(n,k) and C(n,k) for integers 0 ≤ k ≤ n ≤ 1000. Multiplicative BigInt, local-first. Not the factorial calculator.
- Prime Factorization Calculator Factor n = ∏ p^e and test primality for 1 ≤ n ≤ 10^12. Trial division. One capability, two modes.
Algebra & Equations
Quadratic formula, linear ax + b = rhs, and small linear systems.
- Linear Equation Calculator Solve ax + b = rhs for x. Identity and inconsistent cases when a = 0. Not the quadratic formula. Runs locally.
- Linear System Calculator Solve small linear systems Ax = b, plus determinant, inverse, and multiply. Same engine as the matrix workspace. Not a CAS. Runs locally.
- Quadratic Formula Calculator Solve ax² + bx + c = 0 with the quadratic formula. Free online tool — no sign-up. Clear formulas and worked examples. Runs locally in your browser.
Trigonometry & Triangles
Sin, cos, tan, inverse trig, and the general triangle solver.
- Arccos Calculator Calculate arccos(x) = cos⁻¹(x) for x in [−1, 1]. Fast local calculation with shareable, machine-readable results.
- Arcsin Calculator Calculate arcsin(x) = sin⁻¹(x) for x in [−1, 1]. Fast local calculation with shareable, machine-readable results.
- Arctan Calculator Calculate arctan(x) = tan⁻¹(x) for any real x. Fast local calculation with shareable, machine-readable results.
- Cos Calculator Calculate cos(θ) in degrees or radians. Fast local calculation with shareable, machine-readable results.
- Pythagorean Theorem Calculator Solve a right triangle with a² + b² = c². Enter any two of legs a, b and hypotenuse c to find the third side, plus area and perimeter. Try it free.
- Sin Calculator Calculate sin(θ) in degrees or radians. Fast local calculation with shareable, machine-readable results.
- Tan Calculator Calculate tan(θ) = sin(θ)/cos(θ) in degrees or radians. Fast local calculation with shareable, machine-readable results.
- Triangle Solver Solve a Euclidean triangle from SSS, SAS, ASA, AAS, or SSA (ambiguous case). Not the Pythagorean-only calculator. Runs locally.
Geometry
Pythagorean theorem, general triangles, circles, and coordinate geometry.
- Circle Calculator Compute diameter, circumference, and area from r, or arc and sector from a central angle. Not the Pythagorean page. Runs locally.
- Coordinate Geometry Calculator Distance, midpoint, and slope of two points in the plane. Not the Pythagorean-only page. Runs locally.
- Pythagorean Theorem Calculator Solve a right triangle with a² + b² = c². Enter any two of legs a, b and hypotenuse c to find the third side, plus area and perimeter. Try it free.
- Triangle Solver Solve a Euclidean triangle from SSS, SAS, ASA, AAS, or SSA (ambiguous case). Not the Pythagorean-only calculator. Runs locally.
Complex Numbers
Rectangular and polar arithmetic. Family URL waits for more entries.
Numerical Calculus
Numerical roots and definite integrals. Family URL waits for more entries. Not symbolic CAS.
- Definite Integral Calculator Composite trapezoid or Simpson 1/3 of a polynomial, sin, or exp on [a, b]. Not indefinite symbolic integrate. Runs locally.
- Numerical Root Calculator Find a real root of a polynomial with Newton, bisection, or secant. One capability, three methods. Not the nth-root page. Runs locally.
All Math calculators
Full list for search and crawl.
- Antilog Calculator Calculate the antilogarithm: raise base b to power y. Fast local calculation with shareable, machine-readable results.
- Arccos Calculator Calculate arccos(x) = cos⁻¹(x) for x in [−1, 1]. Fast local calculation with shareable, machine-readable results.
- Arcsin Calculator Calculate arcsin(x) = sin⁻¹(x) for x in [−1, 1]. Fast local calculation with shareable, machine-readable results.
- Arctan Calculator Calculate arctan(x) = tan⁻¹(x) for any real x. Fast local calculation with shareable, machine-readable results.
- Circle Calculator Compute diameter, circumference, and area from r, or arc and sector from a central angle. Not the Pythagorean page. Runs locally.
- Complex Number Calculator Add, subtract, multiply, divide complex numbers; convert rectangular ↔ polar. Not a CAS. Runs locally.
- Coordinate Geometry Calculator Distance, midpoint, and slope of two points in the plane. Not the Pythagorean-only page. Runs locally.
- Cos Calculator Calculate cos(θ) in degrees or radians. Fast local calculation with shareable, machine-readable results.
- Definite Integral Calculator Composite trapezoid or Simpson 1/3 of a polynomial, sin, or exp on [a, b]. Not indefinite symbolic integrate. Runs locally.
- Division Calculator Divide numbers with quotient, remainder, and decimal results for quick arithmetic checks. Runs locally in your browser. Free online tool — no sign-up.
- Exponent Calculator Calculate aⁿ for a real base and exponent. Fast local calculation with shareable, machine-readable results.
- Exponential Growth Calculator Model exponential growth or decay from initial value, rate, and time. Runs locally in your browser. Free online tool — no sign-up. Try it free.
- Factorial Calculator Calculate n! for integers 0 ≤ n ≤ 5000. Fast local exact integers with shareable, machine-readable results.
- Fractions Calculator Add, subtract, multiply, or divide fractions and mixed numbers with step-by-step LCD work. Free online tool — no sign-up. Runs locally in your browser.
- GCF Calculator Find the GCF, GCD, or HCF of two or more integers. Exact BigInt Euclidean fold with factor and prime cross-checks. Free, no sign-up.
- LCM Calculator Find the LCM of two or more integers with exact arithmetic and independent verification. Free, no sign-up.
- Linear Equation Calculator Solve ax + b = rhs for x. Identity and inconsistent cases when a = 0. Not the quadratic formula. Runs locally.
- Linear System Calculator Solve small linear systems Ax = b, plus determinant, inverse, and multiply. Same engine as the matrix workspace. Not a CAS. Runs locally.
- Log Calculator Evaluate logarithms (common, natural, or arbitrary base) for x > 0. Fast local calculation with shareable, machine-readable results.
- Modulo Calculator Integer remainder with a = q·m + r and 0 ≤ r < |m|. Euclidean convention, not JavaScript truncated %.
- Multiplication Calculator Multiply two numbers instantly, or see long multiplication with partial products, carrying, decimals, and sign rules. Runs locally in your browser.
- Natural Log (ln) Calculator Calculate ln(x) = log_e(x) for x > 0. Fast local calculation with shareable, machine-readable results.
- Numerical Root Calculator Find a real root of a polynomial with Newton, bisection, or secant. One capability, three methods. Not the nth-root page. Runs locally.
- Percent Error Calculator Compute percent error between experimental and accepted values for lab and measurement checks. Interactive calculations run locally; shared URLs and REST use the same engine. Free — no sign-up.
- Percentage Calculator Calculate percentages, percentage of a number, and “what percent is X of Y” with clear arithmetic steps. Runs locally in your browser. Try it free.
- Percentage Change Calculator Calculate the percentage increase or decrease from an initial value to a final value. You can also solve for the initial or final value. Free online — no sign-up.
- Permutation Combination Calculator Exact P(n,k) and C(n,k) for integers 0 ≤ k ≤ n ≤ 1000. Multiplicative BigInt, local-first. Not the factorial calculator.
- Prime Factorization Calculator Factor n = ∏ p^e and test primality for 1 ≤ n ≤ 10^12. Trial division. One capability, two modes.
- Pythagorean Theorem Calculator Solve a right triangle with a² + b² = c². Enter any two of legs a, b and hypotenuse c to find the third side, plus area and perimeter. Try it free.
- Quadratic Formula Calculator Solve ax² + bx + c = 0 with the quadratic formula. Free online tool — no sign-up. Clear formulas and worked examples. Runs locally in your browser.
- Ratio Calculator Simplify ratios and scale quantities that stay in proportion. Runs locally in your browser. Free online tool — no sign-up. No account needed.
- Root Calculator Calculate the principal real nth root ⁿ√a. Fast local calculation with shareable, machine-readable results.
- Scientific Notation Calculator Convert numbers to scientific, E, and engineering notation. Free online tool — no sign-up. Mobile-friendly and privacy-first. Runs locally in your browser.
- Sin Calculator Calculate sin(θ) in degrees or radians. Fast local calculation with shareable, machine-readable results.
- Square Root Calculator Calculate the principal square root √x. Fast local calculation with shareable, machine-readable results.
- Subtraction Calculator Subtract minuend − subtrahend to get the difference. Free online tool — no sign-up. Clear formulas and worked examples. Interactive calculations run locally in your browser.
- Sum Calculator Add a list of numbers (sum), see the mean, or work long addition with place-value steps. Paste values separated by commas, spaces, or new lines — decimals and negatives.
- Tan Calculator Calculate tan(θ) = sin(θ)/cos(θ) in degrees or radians. Fast local calculation with shareable, machine-readable results.
- Triangle Solver Solve a Euclidean triangle from SSS, SAS, ASA, AAS, or SSA (ambiguous case). Not the Pythagorean-only calculator. Runs locally.