Between 6.022 × 10²³ and the full string of zeros
Convert long numbers into scientific notation, or expand e-notation back into digits. Handles very large and very small values cleanly.
Scientific notation exists so that nobody has to count zeros. Writing the speed of light as 3 × 10⁸ m/s conveys the size instantly; writing 300000000 does not.
It also makes precision explicit. 3 × 10⁸ claims one significant figure, while 2.998 × 10⁸ claims four — the plain digits hide that distinction entirely.
What this calculator shows
- A number converted to standard scientific notation
- E-notation expanded back into ordinary digits
- Correct handling of negative exponents for very small values
What to keep in mind
- Standard form keeps one non-zero digit before the decimal point.
- Very large or very small values may hit the limits of floating-point precision.
FAQs
What does e mean in 1.5e-9?
'Times ten to the power of'. So 1.5e-9 is 1.5 × 10⁻⁹, or 0.0000000015.
How do I write 0.00045 in scientific notation?
4.5 × 10⁻⁴. The exponent counts how many places the point moves right to get back to the original.
Why do calculators switch to this format on their own?
The screen runs out of room. Once a number passes roughly ten digits, notation is the only way to show it without truncating.
Does the exponent affect significant figures?
No, only the digits before the × do. 6.02 × 10²³ has three significant figures regardless of how big the exponent is.
Worked example
Avogadro's number
Input: 602214076000000000000000
Output: 6.02214076 × 10²³
Note: Twenty-three places of zeros compressed into a form you can actually read and compare.