Scientific notation is essential for working with very large or very small numbers in science, engineering, and mathematics, expressing values as a coefficient multiplied by a power of 10. This scientific notation converter works in both directions: convert a standard decimal number into scientific notation (a × 10ⁿ), or convert from scientific notation back into a standard number. It also displays the engineering notation format, where the exponent is always a multiple of three, which is commonly used in electronics and engineering contexts. Whether you're a student learning to express numbers in scientific notation or a professional needing quick conversions for calculations, this tool removes the guesswork.