Scientific Notation Converter – Convert Numbers Online
Convert numbers to and from scientific notation, e-notation and standard form.
About the Scientific Notation Converter
What is the Scientific Notation Converter?
A scientific notation converter rewrites a number in the form m × 10ⁿ and turns scientific or e-notation back into a decimal.
Why use this calculator?
Science, engineering and computing use scientific notation to handle very large or small values compactly, but reading and writing it by hand is easy to get wrong.
How to use it
- Type a decimal number or a value in e-notation.
- Read the scientific, e-notation and decimal forms.
Formula
Scientific notation is written a × 10^b, where 1 ≤ |a| < 10 and b is an integer.
E-notation like 4.2e-4 means the same as 4.2 × 10⁻⁴.
Frequently Asked Questions
What does e mean in a number?
The letter e in e-notation stands for "times ten to the power of", so 3e5 means 3 × 10⁵.
Why use scientific notation?
It keeps very large or very small numbers readable and makes their scale (the exponent) immediately clear.
How precise are the conversions?
Conversions use standard, internationally defined factors and are rounded for display. They are accurate to the number of digits shown.
Can I convert back and forth without losing accuracy?
Yes. Enter the original value to get an exact inverse conversion; avoid chaining rounded results if you need maximum precision.
Which measurement system is used?
Both metric (SI) and US customary / imperial units are supported and clearly labelled.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.