Math calculators
From percentages to proportions, from the quadratic formula to the Pythagorean theorem: TudoCalc's math calculators solve everyday and school problems step by step, always with the formula explained.
Scientific calculator
Free online scientific calculator: sine, cosine, tangent, root, power, log, ln, π and parentheses.
Percentage
Calculate percentages every way: X% of Y, increase, discount and percentage change.
Rule of three
Solve a simple rule of three (direct or inverse): enter three values and find the fourth.
Compound rule of three
Solve problems where two quantities vary at once (machines, days, output...), directly or inversely.
Area of shapes
Calculate the area of a square, rectangle, triangle, circle and trapezoid in seconds.
Pythagorean theorem
Find the hypotenuse or a leg of a right triangle (a² + b² = c²).
Logarithm
Calculate the logarithm of a number in any base, plus natural log (ln), log10 and log2.
Trigonometry (sin, cos, tan)
Calculate the sine, cosine and tangent of an angle in degrees or radians.
Slope / grade
Calculate slope as a percentage, the angle and the ratio from rise and run.
Scientific notation
Convert a number to scientific notation (a × 10ⁿ) and back to decimal form.
Fraction to decimal
Convert a fraction into a decimal number and a percentage.
Roman numerals
Convert numbers to Roman numerals and back (1 to 3999).
Prime factorization
Check if a number is prime and get its prime factorization and number of divisors.
Random number generator
Generate random numbers between a minimum and a maximum, integer or decimal. Draw as many times as you like.
Triangle (from 3 sides)
Enter the three sides to get the angles, area, perimeter and type of the triangle.
Circle (area & circumference)
Enter the radius, diameter, circumference or area and get all the other circle measures.
Volume of solids
Calculate the volume of a cube, box, sphere, cylinder, cone and pyramid — in cm³, liters and m³.
Distance between two points
Calculate the distance between two points (x, y) with the distance formula, plus the midpoint.
Sequence (arithmetic & geometric)
Find the nth term and the sum of an arithmetic (AP) or geometric (GP) sequence.
Scale (map & model)
Convert distances between drawing and reality using the scale (1:N) — for maps, blueprints and models.
Golden ratio
Find the golden-ratio measures (φ ≈ 1.618) from one value — for design, art and layout.
Reverse percentage
Find the original value before a discount or increase, or the number a value is a percentage of.
Ratio
Simplify a ratio A:B and, optionally, split a total in that proportion.
System of equations (2×2)
Solve a system of two linear equations (ax + by = c) with Cramer's rule.
Factorial
Calculate the factorial of a number (n!) and see the product expansion for small numbers.
Complex numbers
Add, subtract, multiply and divide complex numbers (a + bi), with modulus, argument and polar form.
Polynomial derivative
Differentiate polynomials with the power rule and evaluate f(x) and f'(x) at a point.