Convert any decimal to a percentage instantly with our free calculator. See the step-by-step math, move the decimal point correctly, and learn the easy formula. Precise, fast, and easy to use.
How to Change a Decimal to a Percent
Turning a decimal into a percentage is a basic skill used in math and everyday life. A decimal is just a way to show a part of a whole number. A percentage is a way to show that same part out of 100. By changing a decimal to a percent, you make the number easier to read and understand at a glance.
The easiest way to do this is to move the decimal point two spots to the right. In math, this is the same as multiplying the number by 100. The word “percent” actually means “per 100.” Whether you are checking a grade on a test, looking at a sale price, or tracking a bank account, our calculator gives you the exact answer right away.
Frequently Asked Questions
The rule is simple: always jump the decimal point two places to the right. If the number is short, like 0.5, just add a zero at the end to make it 50%. If you want to change a percent back to a decimal, just jump the point two places to the left.
Yes! If your decimal is bigger than 1.0, your percent will be bigger than 100%. This happens a lot when things grow or prices go up. For example, if you have the number 2.5, the math looks like this:
This means the value is two and a half times larger than the starting amount.
Long or repeating decimals work the same way. For 0.333…, you get 33.333…%. Usually, people round this to 33.33% or write it as $33 \frac{1}{3}\%$. Our calculator handles long numbers for you so you don’t have to worry about the math.
We use this math all the time. When a store says “20% off,” they are using this math. When you leave a tip at a restaurant or check the battery on your phone, you are looking at percentages. Turning decimals into percents makes it much easier to compare different numbers quickly.