What is the difference between 1.23 × 10^8 and 1.23E8?

They are identical. The E notation is shorthand for "times 10 to the power of" and is commonly used in programming languages and spreadsheets. The tool accepts both forms as input.

What are SI prefixes?

SI prefixes correspond to powers of 10 in multiples of 3: kilo (10³), mega (10⁶), giga (10⁹), tera (10¹²), milli (10⁻³), micro (10⁻⁶), nano (10⁻⁹), pico (10⁻¹²).

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How to Convert Scientific Notation Free — Standard & Engineering (2026)

By Rui Barreira · Last updated: 18 June 2026

Scientific notation expresses very large or very small numbers compactly using a coefficient and a power of 10. It is the standard format in physics, chemistry, astronomy, and engineering. This tool converts between standard notation (e.g. 123000000) and scientific notation (1.23 × 10^8) in both directions, and also shows the engineering notation variant.

How to Use

Select Standard → Scientific to convert a plain number into scientific notation.
Select Scientific → Standard to expand a scientific notation expression back to its full decimal form.
Enter your value and click Convert.
The result shows both scientific notation and engineering notation, plus the detected significant figure count.

Scientific vs. Engineering Notation

Scientific notation uses any integer exponent: 1.23 × 10^8. Engineering notation restricts the exponent to multiples of 3 (matching SI prefixes: kilo, mega, giga, etc.): 123 × 10^6. Both are equivalent; engineering notation aligns directly with unit prefixes, making it practical for electrical and mechanical engineering.

Significant Figures

When converting standard to scientific, the tool infers the number of significant figures from the input string. Leading zeros are not significant; trailing zeros after a decimal point are. For example, 0.00450 has 3 significant figures (4, 5, 0 after the non-zero start). The output coefficient is formatted to that precision.

Input Formats Accepted (Scientific → Standard)

The tool accepts several common notations: 1.23e5, 1.23E5, 1.23 × 10^5, 1.23×10^5, and 1.23*10^5. All are parsed equivalently.

Frequently Asked Questions

What is the difference between 1.23 × 10^8 and 1.23E8?: They are identical. The E notation is shorthand for “times 10 to the power of” and is commonly used in programming languages and spreadsheets.
What are SI prefixes?: SI prefixes correspond to powers of 10 in multiples of 3: kilo (10^3), mega (10^6), giga (10^9), tera (10^12), milli (10^-3), micro (10^-6), nano (10^-9), pico (10^-12).
Is this free?: Yes, entirely free with no signup required.

Frequently Asked Questions

What is the difference between 1.23 × 10^8 and 1.23E8?: They are identical. The E notation is shorthand for "times 10 to the power of" and is commonly used in programming languages and spreadsheets. The tool accepts both forms as input.
What are SI prefixes?: SI prefixes correspond to powers of 10 in multiples of 3: kilo (10³), mega (10⁶), giga (10⁹), tera (10¹²), milli (10⁻³), micro (10⁻⁶), nano (10⁻⁹), pico (10⁻¹²).
What is the difference between scientific and engineering notation?: Scientific notation uses any integer exponent: 1.23 × 10^8. Engineering notation restricts the exponent to multiples of 3 (matching SI prefixes), so 1.23 × 10^8 becomes 123 × 10^6.