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Significant Figures Calculator

How to count significant figures

  1. Type a number, such as 0.004560 or 1.20e5.
  2. The count of significant figures appears.
  3. Choose how many to round to.

Frequently asked questions

Which zeros count?

Zeros between digits always count, leading zeros never do, and trailing zeros count only when there is a decimal point. In 1200 they are ambiguous; write 1.200e3 to show four.

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