6 calculators available
Math Calculators
Math calculators for everyday calculations including percentages, areas, geometry, and practical problems. Perfect for students, professionals, and quick mental math checks.
Available Calculators
Percentage Calculator
Calculate percentages, percentage increase/decrease, and reverse percentages.
Calculate →Circle Area
Calculate the area and circumference of a circle from its radius or diameter.
Calculate →Rectangle Area
Calculate area, perimeter, and diagonal of a rectangle.
Calculate →Pythagorean Theorem
Calculate the missing side of a right triangle.
Calculate →Tip Calculator
Calculate tips and split bills among multiple people.
Calculate →Discount Calculator
Calculate sale prices and savings from percentage discounts.
Calculate →Related Formulas
Learn the formulas behind these calculations in our formula encyclopedia.
View Math Formulas →Frequently Asked Questions
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original value, then multiply by 100. For example: ((50 - 40) / 40) × 100 = 25% increase.
What is the Pythagorean theorem used for?
The Pythagorean theorem (a² + b² = c²) calculates the length of any side in a right triangle when you know the other two sides. It's used in construction, navigation, and physics.
How do I calculate the area of a circle?
Use the formula A = πr², where r is the radius. If you have the diameter, divide it by 2 to get the radius first.