Loading tool…
ToolWrenConvert any number between ordinary decimal form, scientific (E) notation and engineering notation.
Loading tool…
Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.
Scientific notation writes a number as a value between 1 and 10 multiplied by a power of ten, e.g. 0.00042 becomes 4.2 × 10⁻⁴ (written 4.2e-4). It makes very large or very small numbers compact and easy to compare.
Engineering notation is like scientific notation but the exponent is always a multiple of three (e.g. 420e-6), which lines up with metric prefixes like micro, milli, kilo and mega.
Enter a number in either decimal (0.00042) or E-notation (4.2e-4) and the converter shows all three forms at once.
Scientific notation is a compact way to write very large or very small numbers as a value between 1 and 10 multiplied by a power of ten. So 0.00042 becomes 4.2 × 10⁻⁴ (written 4.2e-4), and 384,000,000 becomes 3.84 × 10⁸. It keeps numbers readable and makes their order of magnitude obvious at a glance.
On computers and calculators, '× 10' is written as the letter e (or E). So 4.2e-4 means 4.2 × 10⁻⁴ = 0.00042, and 3.84e8 means 384,000,000. The number after the e is the exponent: positive shifts the decimal point right (bigger), negative shifts it left (smaller). This converter shows the plain decimal form alongside, so there is no ambiguity.
Engineering notation is a variant where the exponent is always a multiple of three, so it lines up with metric prefixes: 10⁻⁶ is micro, 10⁻³ is milli, 10³ is kilo, 10⁶ is mega. A value like 0.00042 becomes 420e-6 (420 micro-units). Engineers prefer it because the exponent maps directly onto unit prefixes like µF, kΩ or MHz.
Scientific notation is essential in science and engineering, where quantities range from the size of an atom to the distance to a star. It avoids error-prone strings of zeros, makes multiplication and division simpler (you add and subtract exponents), and communicates precision through the number of significant figures shown.
Convert measurements for physics, chemistry and astronomy; read or write numbers in calculator/computer E-notation; line values up with metric prefixes using engineering notation; and sanity-check very large or very small figures. It handles negative numbers and negative exponents, and runs entirely in your browser.