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
75
Topics: All Percentage (75) Fractions (4) Geometry (63)
75 results
Math / Percentage

Percentage Calculator

Solve every common percentage question — "what is X% of Y", "X is what percent of Y", and percentage change.

Featured Trending basic
23,355 4.6 1 min
Math / Percentage

Mean Calculator

Compute the arithmetic mean (average), along with the median, mode, sum, and range, of any comma-separated list of numbe...

basic
14,774 4.7 1 min
Math / Percentage

Linear Equation Solver

Solve a single linear equation of the form ax + b = c for the unknown x, including a clear "no solution / infinite solut...

basic
11,368 4.3 1 min
Math / Percentage

Prime Number Checker

Check whether any positive integer up to a trillion is prime, and if not, the smallest factor that proves it composite.

basic
6,495 4.6 1 min
Math / Percentage

Prime Factorization Calculator

Factor any positive integer into its prime components and list every divisor and the count of distinct prime factors.

basic
23,376 4.4 1 min
Math / Percentage

Significant Figures Calculator

Count the significant figures in a number and round it to a chosen number of significant figures with optional scientifi...

basic
1,613 4.4 1 min
Math / Percentage

Scientific Notation Converter

Convert numbers between standard decimal form and normalized scientific notation (a × 10ⁿ with 1 ≤ |a| < 10).

basic
5,330 4.1 1 min
Math / Percentage

Percentage Change Calculator

Compute the percentage change from an original value to a new value — positive for an increase, negative for a decrease.

basic
23,601 4.3 1 min
Math / Percentage

Percentage Difference Calculator

Compute the percentage difference between two values using the absolute difference divided by their average — useful whe...

basic
20,766 4.6 1 min
Math / Percentage

Exponential Growth Calculator

Project a quantity that grows continuously at a constant rate r over time t, using the standard exponential growth model...

basic
16,873 4.9 1 min
Math / Percentage

Arithmetic Sequence Calculator

Compute the n-th term and the sum of the first n terms of an arithmetic sequence from its first term and common differen...

basic
15,534 4.9 1 min
Math / Percentage

Ratio Calculator

Solve for a missing term in a proportion, simplify ratios, or scale one ratio up or down.

basic
2,927 4.1 1 min
Math / Percentage

Geometric Sequence Calculator

Compute the n-th term and the sum of the first n terms of a geometric sequence from its first term and common ratio.

basic
2,619 4.8 1 min
Math / Percentage

Exponential Decay Calculator

Compute the remaining quantity after time t for an exponentially decaying process N(t) = N₀ · e⁻ᵏᵗ, plus the half-life.

basic
2,092 4.5 1 min
Math / Percentage

Percent Change Calculator

Compute the percent change between an old value and a new value, with the absolute difference and direction.

basic
23,974 4.2 1 min
Math / Percentage

Percent Error Calculator

Compute the percent error between an experimental measurement and the accepted theoretical value.

basic
5,045 4.7 1 min
Math / Percentage

Percent Difference Calculator

Compute the percent difference between two values — the absolute difference divided by their average, expressed as a per...

basic
8,483 4.2 1 min
Math / Percentage

Proportion Calculator

Solve a proportion a/b = c/d for any one of the four values, given the other three.

basic
10,927 4.4 1 min