general
Math & General Calculators
Free online math calculators for percentages, area, slope, Pythagorean theorem, exponents, scientific notation, GPA, and IQ testing. Fast, accurate answers.
Math & General Calculators
Everyday math, geometry, academic tools, and the IQ test — quick, accurate answers.
Percentage Calculator
Solve any percentage problem — increase, decrease, or ratio.
Age Calculator
Exact age in years, months, and days from any birthdate.
GPA Calculator
Weighted GPA from grades and credit hours.
IQ Test
18-question timed test across 4 cognitive categories.
Area Calculator
Area of circles, rectangles, triangles, and more.
Slope Calculator
Slope, distance, and midpoint between two points.
Pythagorean Theorem
Find any side of a right triangle from the other two.
Exponent Calculator
Raise any number to any power instantly.
Scientific Notation
Convert to and from scientific notation with steps.
Related Guides
How to Use This Calculator
- Pick a math calculator below.
- Enter your values.
- Get instant, accurate results.
The Formula
Each calculator uses its own formula — see individual pages for step-by-step breakdowns.Learn More
Math
How to Calculate Percentage: 3 Methods Anyone Can Use
Three simple methods for percentages: of a number, between values, and change.
MathMensa Qualification Guide: Scores, Tests, and How to Join
Mensa accepts members at the 98th percentile. Here's exactly what that means and how to qualify.
MathEvery IQ Test Type Compared: Mensa, Raven's, Wechsler, and More
Mensa, Wechsler, Raven's, culture-fair: the major IQ tests side-by-side, with the trade-offs explained.
Frequently Asked Questions
Yes — 18 timed questions across pattern recognition, number sequences, verbal analogies, and logical reasoning.