Paste numbers, one per line, and convert them between decimal, scientific, engineering and E notation, with no digits lost on long numbers. Runs on your device.
To write a number in scientific notation, move the decimal point until exactly one nonzero digit is in front of it, then multiply by 10 raised to the number of places you moved it. Moving left gives a positive power and moving right gives a negative one. The page opens on five numbers. 0.000000345 becomes 3.45 × 10⁻⁷, because the point moves 7 places to the right. 123456789 becomes 1.23456789 × 10⁸, moving 8 places to the left. The same number in E notation, the form code and spreadsheets use, is 3.45e-7 and 1.23456789e8. Standard form, the name used in some countries, is the same thing as scientific notation.
Engineering notation keeps the exponent a multiple of 3, so it lines up with the prefixes milli, micro, nano, kilo, mega and giga. It allows one to three digits before the point. 0.000000345 is 345 × 10⁻⁹ in engineering notation, which reads as 345 nano. 123456789 is 123.456789 × 10⁶, and 6.02214076e23 is 602.214076 × 10²¹. A number such as 0.5 is 500 × 10⁻³. Choose Engineering and the exponent is chosen for you. The table shows scientific, engineering, E notation and decimal for every line next to each other.
Zeros at the end of a whole number are treated as placeholders, so 1500 becomes 1.5 × 10³. Zeros after a decimal point are kept, because they state precision: 1500. becomes 1.500 × 10³ and 12.50e1 stays 125.0 in decimal. To force a precision, set Round to significant figures. 123456 at 3 figures is 1.23 × 10⁵; 999.5 at 3 is 1.00 × 10³; 1.5 at 4 gets zeros added, 1.500. Rounding goes half away from zero, so 1.005 at 3 figures is 1.01. The significant figures calculator on this site counts and rounds a single number with the rules explained.
The page reads each line as digits and an exponent, not as a floating-point number. A 30-digit integer such as 123456789012345678901234567890 converts to 1.2345678901234567890123456789 × 10²⁹ and back to the same 30 digits, where a calculator would show 1.2345678901234568e+29. Each number can have up to 1,000 characters and an exponent from −9,999 to 9,999. Decimal output is written out only up to 400 characters, so 1e500 is shown in scientific and E notation, and the Decimal column says it is too long to write out.
Each line is one number. The page reads 123.4, .5, 5., a leading + or −, thousands commas as in 1,234,567, E notation such as 1.5E3, and 1.5 x 10^3, 1.5 × 10^3 or 1.5 × 10³. Spaces inside a number are ignored, so 1 200 000 is 1,200,000. A line it cannot read gets the words Not a number in the result and is counted separately, and blank lines stay blank. Up to 2,000 lines are converted at once. A decimal comma such as 3,5 is not read as a decimal.
Move the decimal point until one nonzero digit is before it, and multiply by 10 to the number of places moved. 0.000000345 is 3.45 × 10⁻⁷, and 123456789 is 1.23456789 × 10⁸. Paste the number and the page does it, line by line.
Choose Decimal and paste the number in any form: 3.45e-7, 3.45 x 10^-7 or 3.45 × 10⁻⁷ all give 0.000000345. A positive exponent adds zeros: 6.02214076e23 gives 602214076000000000000000.
E notation writes × 10 as the letter e. 1.5e3 means 1.5 × 10³, which is 1500, and 2.5e-4 means 2.5 × 10⁻⁴, which is 0.00025. Programming languages and spreadsheets use it. Choose E notation to convert a list.
In scientific notation there is one digit before the point and any exponent. In engineering notation the exponent is a multiple of 3, with up to three digits before the point. 4.5 × 10⁻⁴ is 450 × 10⁻⁶ in engineering notation, which reads as 450 micro.
Calculators work with floating-point numbers, which keep about 15 to 17 significant digits. This page keeps every digit you type, up to 1,000 characters per number, so 123456789012345678901234567890 does not become 1.2345678901234568e+29.
No. The numbers are processed in your browser, in this tab, and no server receives them. Your choices of format, style and figures are saved in this browser, but the numbers are not, so closing the tab clears them. Google Analytics counts visits and copy presses, never the numbers.