Scientific Notation Converter
Convert any number between scientific notation, E-notation, engineering notation and plain decimal, with significant figures.
Convert a number
- Scientific notation
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- E-notation
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- Engineering notation
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- Decimal (standard form)
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- Significant figures
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- Order of magnitude
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- SI prefix form
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Scientific notation arithmetic
- Result (scientific)
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- Result (decimal)
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How it works
This scientific notation converter turns any number into standard scientific notation
(one digit before the decimal point, times a power of ten), E-notation, engineering
notation and plain decimal form — all at the same time, live as you type. It reads whatever
you paste: 0.00000123, 1.23e-6, 1.23E-6 and
1.23 × 10⁻⁶ are all understood, and commas or spaces used as thousands
separators are ignored. Pick a significant-figures value to round the answer the way your
physics or chemistry homework asks for.
The conversion works on the digits of your number as text rather than on floating-point values, so very large and very small exponents stay exact instead of drifting — 1.23 × 10⁻⁶ expands to exactly 0.00000123. Engineering notation snaps the exponent to a multiple of three and shows the matching SI prefix (kilo, mega, milli, micro …), which is what electronics and lab work usually want. The arithmetic section multiplies, divides, adds and subtracts two numbers written in scientific notation and normalises the answer for you. Everything runs in your own browser: nothing is uploaded, there is no account and no ads.
Frequently asked questions
How do you write a number in scientific notation?
You move the decimal point until exactly one non-zero digit sits in front of it, then multiply by ten raised to the number of places you moved. Moving left gives a positive exponent, moving right gives a negative one: 12345 becomes 1.2345 × 10⁴ and 0.0000456 becomes 4.56 × 10⁻⁵. Type any number above and the converter does the counting for you, showing the scientific form, the E-notation form and the plain decimal side by side.
What is 0.00000123 in scientific notation?
0.00000123 is 1.23 × 10⁻⁶, written as 1.23e-6 in E-notation. The decimal point moves six places to the right to leave 1.23, so the exponent is −6. Because an exponent of −6 is already a multiple of three, the engineering form is the same, 1.23 × 10⁻⁶, and the SI prefix is micro: 1.23 µ. The tool accepts the answer as input too, so you can paste 1.23 × 10⁻⁶ back in and get the decimal expansion.
What is the difference between scientific and engineering notation?
Scientific notation always keeps one digit before the decimal point, so 12345 is 1.2345 × 10⁴. Engineering notation instead forces the exponent to a multiple of three so it lines up with the SI prefixes, giving 12.345 × 10³ — that is 12.345 kilo. Engineering form is what you want for electronics, sensors and lab measurements; this page shows both at once, plus the matching prefix name and symbol, so you never have to convert twice.