28 tools to help you learn something.
Find a percentage of any number, instantly.
37% of 240
88.8
See the percentage increase between two values.
Percentage increase
25%
20%
Percentage decrease
Percentage Decrease Calculator
The percentage change from one value to another.
Percentage change
+30%
Find the original value before a percentage change.
Original value
100
The percentage difference between two numbers.
Percentage difference
40%
Work out the discount and the final price.
Final price
60
Turn a fraction into a percentage.
As a percentage
75%
Add, subtract, multiply and divide fractions.
Result
5/6
3/4
Simplified
Simplify Fractions
Convert a fraction to a decimal.
As a decimal
0.375
Simplify a ratio to its lowest terms.
Simplified ratio
2 : 3
Solve a/b = x/d for the missing value.
x
12
Find the cost or amount per single unit.
Per unit
3
Raise a base to any power.
2^5
32
Find the square root of a number.
√144
5
log2(32)
Logarithm Calculator
Calculate ln(x) — log base e.
ln(20)
2.995732
Solve ax + b = c for x.
6
Solve ax² + bx + c = 0 using the quadratic formula.
Roots
x = 3 or 2
Area of a triangle from base and height.
Area
30
Area of a circle from its radius.
78.539816
Find a missing side of a right triangle.
Hypotenuse c
18
Mean
Mean Calculator
The middle value of a set of numbers.
Median
Measure the spread of a data set.
Population standard deviation
2
The probability of a single event.
Probability
0.166667
See how money grows with compound interest.
Final amount
1,647.01
