Scientific Notation Converter

Convert ordinary numbers into scientific notation and expand scientific notation back into a plain decimal number.

Scientific notation converter

Direction

Result: —

Coefficient: — · Exponent: —

Both directions accept plain values such as 0.00345 or notation such as 3.45e-3.

Common questions about the free online scientific notation converter.

Scientific notation writes a number as a coefficient multiplied by a power of ten, such as 3.45 times ten to the power of minus three.

Choose the number to scientific notation direction, type the value, and the coefficient, exponent and combined form appear instantly.

Switch the direction, enter a value such as 3.45e-3, and the tool expands it into an ordinary decimal number.

You can type 3.45e-3, 3.45E-3, 3.45 times 10 to the power of minus 3, or a plain decimal number such as 0.00345.

Standard scientific notation keeps one non-zero digit before the decimal point, so the coefficient always stays in that range.

Very large values get a positive exponent, and the expanded form is shown in full, including the trailing zeros.

Values below one get a negative exponent, so 0.00345 becomes 3.45 times ten to the power of minus three.

Zero is written as 0 with an exponent of 0, because no power of ten can ever produce zero as a result.

No. The conversion happens locally in your browser and nothing you type is ever transmitted anywhere.

Last updated: October 10, 2026