Math
Homework helpers and everyday number tools — averages to triangles — with clear formulas.
Math shows up everywhere: splitting a bill fairly, estimating area, checking a grade-point average, or verifying a percent discount. These calculators focus on the relationships teachers and textbooks use most—sums and ratios, circles and right triangles, roots and weighted averages—so you get a trustworthy answer and see how it was produced.
Averages & GPA
The mean summarizes a list of numbers; GPA weights courses by credit so harder schedules compare fairly.
Fractions & percents
Fractions describe parts of a whole; percents are fractions out of 100—ideal for discounts, tips, and growth rates.
Circles & triangles
π ties radius to circumference and area; right triangles pair Pythagoras with trig ratios for missing sides and angles.
Roots & powers
Square roots undo squaring; they appear in distance formulas, standard deviation steps, and geometry.
Calculators
View all math toolsAverage Calculator
Arithmetic mean for any list—add the values, divide by how many there are.
Circle Calculator
Area and circumference (and related quantities) from radius or diameter—pick the inputs your problem gives you.
Fraction Calculator
Add, subtract, multiply, or divide fractions after finding common denominators when needed.
GPA Calculator
Weighted grade-point average using credit hours—matches common semester reporting styles.
Percentage
What percent one number is of another, or find a part from a percent—discounts and growth in one place.
Right Triangle Calculator
Missing side lengths or angles in right triangles using Pythagoras and trig relationships.
Square Root
Principal square root of a nonnegative number—useful for geometry, statistics, and checking mental math.
Guides & Articles
View all Math articles
Types of Math Calculations: A Student and Professional Guide
Discover the essential types of math calculations in our student and professional guide. Master arithmetic, geometric, trigonometric, and statistical...
Midpoint Formula Explained: A Student's Guide
Unlock the secrets of the midpoint formula with our student-friendly guide. Learn how to find the center point in coordinate geometry and beyond!
Does GPA Actually Matter for Getting a Job?
The honest, data-backed answer to whether employers care about your GPA, including when it matters a lot, when it barely matters, and when it stops mattering entirely.
How calculators shape learning: Benefits and challenges
Explore the evolving role of calculators in education, uncovering their benefits and challenges in shaping modern learning strategies.
Fraction calculators: Save time and ensure precision
Discover why use fraction calculators to eliminate errors and save time in calculations. Get instant, precise results with step-by-step breakdowns!
Prime Factorization Explained: Steps, Algorithms, Strategies
Master prime factorization with clear steps, algorithms, and strategies. Unlock confidence in advanced math and tackle challenging numbers!
Understand the Law of Cosines: Formula, Proof, and Uses
Unlock the law of cosines! Learn its formula, proof, and real-world applications to solve non-right triangle problems confidently.
How to divide decimals: a step-by-step guide
Learn how to divide decimals effectively with this step-by-step guide. Master key techniques and boost your confidence in calculations!
Master the Pythagorean theorem: proofs, uses, and insights
Learn what the Pythagorean theorem says, how proofs work, when it applies in flat geometry, real-world uses, Pythagorean triples, and how to practice with calculators.
Formula Quick Reference
Common textbook relationships behind these calculators—always match units and diagram labels to your problem statement.
| Formula | Equation | Variables | Result unit | Calculator |
|---|---|---|---|---|
| Arithmetic mean | x̄ = (x₁ + x₂ + … + xₙ) / n | xᵢ = data values, n = count | same as data | Use calculator → |
| Circle area | A = πr² | r = radius (same units as A^(1/2)) | square units | Use calculator → |
| Circle circumference | C = 2πr = πd | d = diameter | linear units | Use calculator → |
| Pythagorean theorem | a² + b² = c² | c = hypotenuse of a right triangle | length² → length | Use calculator → |
| Percent | p = (part / whole) × 100 | whole ≠ 0 | % | Use calculator → |
| Fraction addition | a/b + c/d = (ad + bc) / (bd) | common denominator bd when denominators differ | fraction | Use calculator → |
| Weighted GPA | GPA = Σ(gᵢ · wᵢ) / Σ wᵢ | gᵢ = grade points, wᵢ = credit weights | grade points | Use calculator → |
| Square root | y = √x ⟺ y² = x (x ≥ 0) | principal (nonnegative) root | same dimension as √x | Use calculator → |
Watch & Learn
Khan Academy geometry clips—right triangles, circles with π, and a classic proof—paired with the tools above.
The Pythagorean theorem intro | Right triangles and trigonometry | Geometry
Core relationship behind our Right Triangle Calculator: how legs and hypotenuse connect in right triangles.
Volume of a sphere | Perimeter, area, and volume | Geometry
Uses π and radius—same circle ideas as area on our Circle Calculator, extended to three dimensions.
Garfield's proof of the Pythagorean theorem | Geometry
A visual proof strategy—helpful intuition after you have computed numeric sides on the calculator.
Frequently Asked Questions
Means, π, fractions, triangles, and GPA—answered in plain language.