Scientific notation converter
Convert numbers between standard decimal, scientific notation, and engineering notation. Supports very large and very small values with adjustable precision.
- Free, no sign-up
- No data stored
- Reviewed 2026-08-01
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About the Scientific Notation Converter
Scientific notation expresses very large or very small numbers in a compact form (e.g., 3.0 × 10⁸ instead of 300,000,000). This converter instantly translates between standard decimal form, scientific notation (a × 10ⁿ), E notation (aEn), and engineering notation (exponent always a multiple of 3).
Enter any number — with or without an exponent — and the tool shows all equivalent representations simultaneously. Adjust the number of significant figures to control precision, and copy any format with a single click.
Ideal for students working through physics or chemistry problems, engineers handling sensor data, and developers who need to format or parse scientific values in code.
How to use the Scientific Notation Converter
- Enter a number in any format (decimal, scientific, or E notation).
- View the instant conversion to all supported formats.
- Adjust the significant figures slider to control precision.
- Copy the desired format using the copy icon next to each result.
- Use the swap button to enter a new value quickly.
Frequently asked questions
What is scientific notation?
Scientific notation writes a number as a coefficient (between 1 and 10) multiplied by a power of 10. For example, 0.00045 becomes 4.5 × 10⁻⁴. It makes extremely large or small values easier to read, compare, and calculate with.
What is the difference between scientific and engineering notation?
Engineering notation restricts the exponent to multiples of 3, aligning with SI prefixes (kilo, mega, giga, milli, micro, nano). The coefficient can range from 1 to 999 instead of 1 to 9.9.
What does E notation mean?
E notation is the computer-friendly form where "E" replaces "× 10^". For example, 6.022E23 means 6.022 × 10²³. It is used in programming languages, spreadsheets, and scientific instruments.
How many significant figures should I use?
Use the same number of significant figures as your original measurement. For general conversions, 4–6 significant figures provide a good balance between precision and readability.
Sources
Figures are estimates for guidance only. Always confirm with the official source or a qualified professional before acting on them.