45 calculators
Mathematics calculators
Algebra, number theory, fractions, bases and the rest of the school and university toolkit, at arbitrary precision.
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C
E
- Exponential decay Decay by a fixed rate per period, with half-life and the decay constant.
- Exponential growth Growth by a fixed rate per period, with doubling time and the continuous-growth equivalent.
- Exponents Raise a number to any power, including negative and fractional exponents, at high precision.
F
- Factorial n factorial as an exact integer, however many digits it takes, with the digit count.
- Fibonacci number The nth Fibonacci number by the closed-form Binet formula, with the golden-ratio limit.
- Fraction to decimal Convert a fraction to a decimal and a percentage, with the reciprocal and the mixed number.
G
- GCD and LCM Greatest common divisor and least common multiple of two integers, by the Euclidean algorithm.
- Geometric sequence The nth term, the partial sum and the infinite sum of a geometric progression.
- Golden ratio Split a length in the golden ratio, or find the longer or shorter part from the other.
I
L
- Law of cosines Third side of a triangle from two sides and the included angle, plus all three angles and the area.
- Law of sines Solve a triangle from two angles and a side, with the circumradius.
- Linear equation Solve ax + b = cx + d for x, exactly.
- Linear interpolation Find a value between two known points on a straight line, or extrapolate beyond them.
- Logarithms Natural log, base-10, base-2 and logarithms to any base, computed at 45 digits.
P
- Percent error Error of a measurement against a known true value, with the absolute and relative error.
- Percent of total Turn a part and a whole into a percentage, a fraction and a ratio.
- Percentage change Percentage change between two values, in both directions, with the absolute difference.
- Percentage difference The symmetric measure: difference divided by the mean of the two values.
- Percentage of a number What is X percent of Y, what percent one number is of another, and the reverse of both.
- Polar and Cartesian Convert between polar and Cartesian coordinates in both directions.
- Pythagorean theorem Hypotenuse from two legs, or the missing leg from the hypotenuse, with the angles.
R
- Ratios Simplify a ratio, scale it up, and solve a proportion for the missing term.
- Reverse percentage Recover the original value from a figure that already has a percentage added or removed.
- Roman numerals Convert a number from 1 to 3999 into Roman numerals, with the year and the additive breakdown.
- Roots Square, cube and nth roots to 45 digits, with perfect roots recognised as exact.
S
- Scale factor Convert between model and real dimensions at any scale, with the area and volume factors.
- Scientific notation Move between plain decimal, scientific notation, engineering notation and the order of magnitude.
- Significant figures Round to a number of significant figures or decimal places, and see the rounding error.
- Slope and line Slope, intercept, angle, distance and midpoint from two points on a line.
- Sum of integers Sum, sum of squares and sum of cubes from 1 to n, by closed formula.
- System of two equations Solve two simultaneous equations in two unknowns by determinants, exactly.
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