Math
Math tools cover the percentage, average, fraction and algebra questions people actually search for — plus a scientific calculator for mixed expressions.
Formulas are shown on each page so you can check the method, not just the result, and every calculation runs in your browser. “20% of” is not the same as “20% off”, and a change from an old total to a new total is a third idea. Markup of cost is not margin of the selling price.
Start with the percentage or markup-versus-margin guide if you are unsure which sentence you are asking.
Featured in this category
Percentage Calculator
Calculate percentages three ways: find a percentage of a number, find what percent one number is of another, or find the total when you know a part and a percentage.
Scientific Calculator
Evaluate expressions with powers, roots, logs, factorials and trigonometry in degrees or radians.
Fraction Calculator
Add, subtract, multiply or divide two fractions and see the simplified result, mixed number and decimal.
Percentage Change
Find how much a value increased or decreased as a percentage of the original amount.
Guides
How Percentages Work
A percentage is a part compared with a whole out of 100. The formula changes with the sentence: percent of, what percent, or what total. Percent change between two totals is a different calculation.
Markup Versus Margin
Markup adds a percent of cost onto the cost. Margin is that same profit divided by the selling price. The two percents match only at zero and are never interchangeable on a quote.
Basic Math
Percentage Calculator
Calculate percentages three ways: find a percentage of a number, find what percent one number is of another, or find the total when you know a part and a percentage.
Percentage Change
Find how much a value increased or decreased as a percentage of the original amount.
Percent Error
Measure how far an experimental value sits from an accepted or theoretical value, as a percentage.
Discount Calculator
Work out the amount saved and the sale price from an original price and a percent off.
Markup Calculator
Add a markup percent to cost to get the markup amount and selling price.
Margin Calculator
From cost and selling price, see profit, margin percent and markup percent.
Average Calculator
Find the arithmetic mean, count and sum of a list of numbers pasted or typed in your browser.
Rounding Calculator
Round a number to a chosen number of decimal places, or to the nearest ten, hundred or thousand.
Random Number Generator
Draw one or more random integers or decimals between a minimum and a maximum in your browser.
Number Theory
Ratio Calculator
Simplify two numbers to lowest terms and see the decimal relationship A ÷ B.
LCM Calculator
Find the least common multiple of two or more integers pasted as a list.
GCF Calculator
Find the greatest common factor (GCD) of two or more integers pasted as a list.
Factor Calculator
List every positive factor of an integer and see its prime factorization.
Binary Calculator
Convert between binary and decimal, or add, subtract, multiply and divide whole binary numbers.
Hex Calculator
Convert between hexadecimal and decimal, or add, subtract, multiply and divide whole hex numbers.
Algebra
Fraction to Decimal
Convert a numerator and denominator into a decimal and a percentage.
Fraction Calculator
Add, subtract, multiply or divide two fractions and see the simplified result, mixed number and decimal.
Exponent Calculator
Raise a base to a power, including negative and fractional exponents, with overflow rejected.
Root Calculator
Find the nth root of a number, including odd roots of negatives such as the cube root of −8.
Log Calculator
Compute a logarithm in base 10, base e, base 2, or any custom positive base other than 1.
Quadratic Formula
Solve ax² + bx + c = 0 for real roots, and see the discriminant and vertex.
Scientific Notation
Convert a decimal to normalized scientific notation, or turn a coefficient and exponent back into a number.
Advanced Math
All math tools
Search or scan the full list for this category.
23 tools
Percentage Calculator
Calculate percentages three ways: find a percentage of a number, find what percent one number is of another, or find the total when you know a part and a percentage.
Percentage Change
Find how much a value increased or decreased as a percentage of the original amount.
Percent Error
Measure how far an experimental value sits from an accepted or theoretical value, as a percentage.
Discount Calculator
Work out the amount saved and the sale price from an original price and a percent off.
Markup Calculator
Add a markup percent to cost to get the markup amount and selling price.
Margin Calculator
From cost and selling price, see profit, margin percent and markup percent.
Average Calculator
Find the arithmetic mean, count and sum of a list of numbers pasted or typed in your browser.
Ratio Calculator
Simplify two numbers to lowest terms and see the decimal relationship A ÷ B.
Fraction to Decimal
Convert a numerator and denominator into a decimal and a percentage.
Fraction Calculator
Add, subtract, multiply or divide two fractions and see the simplified result, mixed number and decimal.
Scientific Calculator
Evaluate expressions with powers, roots, logs, factorials and trigonometry in degrees or radians.
Exponent Calculator
Raise a base to a power, including negative and fractional exponents, with overflow rejected.
Root Calculator
Find the nth root of a number, including odd roots of negatives such as the cube root of −8.
Log Calculator
Compute a logarithm in base 10, base e, base 2, or any custom positive base other than 1.
Rounding Calculator
Round a number to a chosen number of decimal places, or to the nearest ten, hundred or thousand.
LCM Calculator
Find the least common multiple of two or more integers pasted as a list.
GCF Calculator
Find the greatest common factor (GCD) of two or more integers pasted as a list.
Factor Calculator
List every positive factor of an integer and see its prime factorization.
Quadratic Formula
Solve ax² + bx + c = 0 for real roots, and see the discriminant and vertex.
Scientific Notation
Convert a decimal to normalized scientific notation, or turn a coefficient and exponent back into a number.
Random Number Generator
Draw one or more random integers or decimals between a minimum and a maximum in your browser.
Binary Calculator
Convert between binary and decimal, or add, subtract, multiply and divide whole binary numbers.
Hex Calculator
Convert between hexadecimal and decimal, or add, subtract, multiply and divide whole hex numbers.