Classroom Math

Math, without the guesswork.

Free, precise tools to calculate, check and understand the fundamentals of mathematics.

Classroom Math

Percentage Calculator

Find a percentage of any number, instantly.

37% of 240

88.8

Open instrument

In this area

28 specialized tools, grouped by what you are trying to do. Start anywhere, follow the path.

Learn something

28 tools

Learn something

27 tools

Classroom Math

Percentage Increase Calculator

See the percentage increase between two values.

Percentage increase

25%

Change20

VerifiedOpen

Classroom Math

Percentage Decrease Calculator

See the percentage decrease between two values.

Percentage decrease

20%

Decrease20

Open

Classroom Math

+30%

Percentage change

Percentage Change Calculator

Classroom Math

Reverse Percentage Calculator

Find the original value before a percentage change.

Original value

100

Multiplier× 1.2

Open

Classroom Math

Percentage Difference Calculator

The percentage difference between two numbers.

Percentage difference

40%

VerifiedOpen

Classroom Math

Percentage Discount Calculator

Work out the discount and the final price.

Final price

You save20

Open

Classroom Math

Fraction to Percentage

Turn a fraction into a percentage.

As a percentage

75%

VerifiedOpen

Classroom Math

Fraction Calculator

Add, subtract, multiply and divide fractions.

Result

5/6

As a decimal0.833333

Open

Classroom Math

3/4

Simplified

Simplify Fractions

Classroom Math

Fraction to Decimal

Convert a fraction to a decimal.

As a decimal

0.375

Open

Classroom Math

Ratio Calculator

Simplify a ratio to its lowest terms.

Simplified ratio

2 : 3

Divided both by6

VerifiedOpen

Classroom Math

Proportion Calculator

Solve a/b = x/d for the missing value.

Open

Classroom Math

Unit Rate Calculator

Find the cost or amount per single unit.

Per unit

VerifiedOpen

Classroom Math

Exponent Calculator

Raise a base to any power.

2^5

Open

Classroom Math

√144

Square Root Calculator

Classroom Math

Logarithm Calculator

Calculate a logarithm in any base.

log2(32)

Open

Classroom Math

Natural Log Calculator

Calculate ln(x) — log base e.

ln(20)

2.995732

VerifiedOpen

Classroom Math

Linear Equation Calculator

Solve ax + b = c for x.

Open

Classroom Math

Quadratic Formula Calculator

Solve ax² + bx + c = 0 using the quadratic formula.

Roots

x = 3 or 2

Triangle Area

Area of a triangle from base and height.

Area

Open

Classroom Math

78.539816

Area

Circle Area

Classroom Math

Pythagorean Theorem

Find a missing side of a right triangle.

Hypotenuse c

Open

Classroom Math

Mean Calculator

The average of a set of numbers.

Mean

Median Calculator

The middle value of a set of numbers.

Median

Sorted1, 3, 5, 7, 9

Open

Classroom Math

Standard Deviation Calculator

Measure the spread of a data set.

Population standard deviation

Probability Calculator

The probability of a single event.

Probability

0.166667

As a percentage16.666667%

As a fraction1/6

Open

Classroom Math

1,647.01

Final amount

Compound Interest Calculator

Other areas

Business12 tools Work6 tools Money7 tools Home and Family4 tools Travel and Life3 tools Education3 tools Currency & International Money10 tools