Round 123.456 to 1 Decimal Place
123.456 rounded to 1 decimal place is 123.5.
How to use this tool
- Enter number and decimal places in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your rounded value and the full breakdown beneath it.
Rounding 123.456 to 1 decimal place gives 123.5.
Frequently asked questions
- How does rounding work?
- When the digit after the rounding position is 5 or greater, round up; otherwise round down. For example, 3.14159 rounded to 2 decimals = 3.14.