Significant Figures Calculator - 6 Significant Figures

📘 About the Significant Figures

Significant figures are the meaningful digits in a numerical value.

The current website output formatter itself uses a six-significant-figure convention for the sig format, so this calculator mirrors that concept numerically.

🧮 Formula

Order of magnitude

n = floor(log10(|x|))

Six-significant-figure approximation

Rounded value ≈ round(x ÷ 10^(n−5)) × 10^(n−5)

Where

x = input number
n = floor(log10(|x|))

This calculator targets six significant figures and is intended for non-zero values.

✏️ Worked example

12345.6789

You enter
Number	12345.6789

You get
Approximate 6 Significant Figures	12,345.7
Order of Magnitude	4

The calculator returns an approximate six-significant-figure representation.

Try this example →

🧭 How to use this calculator

What you enter

Number

What you get

Approximate 6 Significant Figures
Order of Magnitude

💡 Important note

The calculator is designed around six significant figures.
Zero does not have a meaningful order of magnitude under the logarithm-based formula.
For measurement reporting, the appropriate number of significant figures depends on the precision of the measurement or instrument.

❓ Frequently asked questions

What are significant figures?

They are digits that convey the meaningful precision of a measured or calculated value.

How many significant figures does this calculator use?

It targets six significant figures, matching the current sig output convention used by the calculator engine.

sig Significant Figures Calculator

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