Rounding & Significant Figures Calculator
Use this free rounding calculator to round any number — to the nearest ten, hundred, or thousand, to a number of decimal places, or to a set number of significant figures — with the rounding rule shown step by step.
How rounding works
Find the digit in the place you’re rounding to, look at the digit just to its right, and round up if it’s 5 or more, otherwise keep it the same. The calculator highlights exactly which digits it used.
Original price was: $109.99.$54.99Current price is: $54.99.
Frequently asked questions
How do you round to a place value?
Look at the digit to the right of the place you want; if it’s 5 or more, round up, otherwise round down.
What are significant figures?
The digits that carry meaning in a number. Rounding to 2 significant figures keeps the first two meaningful digits.
Original price was: $109.99.$54.99Current price is: $54.99.
How is 2.5 rounded to a whole number?
With round-half-up, 2.5 rounds to 3.
Original price was: $109.99.$54.99Current price is: $54.99.
Read the full lesson: learn the method step by step.
Original price was: $27.99.$17.99Current price is: $17.99.
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