Fraction
MathAdd, subtract, multiply, or divide fractions and see the reduction steps.
- How do I combine two fractions?
- What is the simplified form?
Inputs
Two fractions and an operation
Output
Simplified, mixed, and decimal forms
Open calculator
MathUpdated · Aug 2026
Percentage Calculator
Answer the three percentage questions people ask most, with the right inputs for each one.
Start with your numbers
Percentage Calculator
Change the inputs that matter to your decision. Optional assumptions stay collapsed until you need them.
Choose the question
Pick the percentage question you are actually asking; the inputs change with it.
Your values
%
Percentage answer
Result
30.00
15% of 200 is 30.
Formula15% × 200 = 30
15% × 200 = 30
Display values are rounded for readability; the URL preserves the entered inputs.
/ 01 · FAQ
Frequently asked questions
Practical notes about the inputs, assumptions, and result.
Choose What is X% of Y?, then enter the percentage and the number. The calculator multiplies the number by the percentage divided by 100.
Percentage change compares the difference between the new and old values with the absolute old value, then multiplies by 100.
/ 02 · RELATED
Related calculators
Other tools in math.
Average
MathSummarize a dataset with mean, median, mode, range, and standard deviation.
- What is the center of this dataset?
- How spread out are the values?
Inputs
A list of values
Output
Mean, median, mode, spread
Open calculator
Area
MathCalculate the area of common 2D shapes and see the applicable perimeter or circumference.
- What is the area of this shape?
- What formula should I use for a circle or triangle?
Inputs
Shape and dimensions
Output
Area, perimeter, formula
Open calculator