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How scientific notation works

Scientific notation writes a value as a coefficient multiplied by a power of ten. A common normalized form keeps the absolute value of the coefficient at least 1 and less than 10. E notation expresses the same idea in plain text: 3.5e+6 means 3.5 × 10⁶.

Worked examples

• 3,500,000 becomes 3.5e+6.
• 0.00042 becomes 4.2e-4.
• -1,200 becomes -1.2e+3.

Moving the decimal point left produces a positive exponent for a large magnitude. Moving it right produces a negative exponent for a small magnitude.

Why a large value may still display with an “e”

This tool uses the browser’s JavaScript Number type. When converting scientific notation back to a numeric string, JavaScript may still choose exponential notation for sufficiently large or small magnitudes. That is a display behavior, not a different numerical value.

Precision limitation

JavaScript Number uses binary floating-point rather than arbitrary-precision decimal arithmetic. Very long integers and decimal values can therefore be rounded. Do not use this tool as an arbitrary-precision scientific calculator or as a substitute for a decimal/big-number library when every digit must be preserved.

Privacy

The conversion runs locally in the browser. The tool does not require a server request to transform the value.

Common questions

Is E notation the same as scientific notation?

E notation is a plain-text representation of multiplication by a power of ten. For example, 6.02e23 represents 6.02 × 10²³.

Does this tool control significant figures?

No. It uses the browser’s default numeric conversion. A future precision-focused tool could add explicit significant-figure controls.

Can I enter negative numbers?

Yes. The sign of the coefficient is preserved.

Reference and related tools

NIST Guide to the SI, Appendix B: Conversion Factors documents E notation in its conversion-factor tables.