Standard Form Converter
Convert ordinary decimals, scientific notation, or E notation in either direction. The tool also gives engineering notation and explains exactly how the decimal point moves.
Written and checked by TheToolNet Editorial Team · Last reviewed: September 19, 2026 · How we check number tools
Normalized scientific notation has one non-zero digit before the decimal point.
Convert standard and scientific notation
Enter a decimal, 6.02e23, or 6.02 × 10^23. Commas and spaces are ignored.
Converting numbers to scientific notation
Move the decimal until the coefficient's absolute value is at least 1 but less than 10. Count the moves. Moving left creates a positive exponent; moving right creates a negative exponent. To reverse the process, follow the exponent: positive moves right and negative moves left.
Standard and scientific notation examples
| Standard number | Scientific notation | E notation |
|---|---|---|
| 45,000 | 4.5 × 10⁴ | 4.5E4 |
| 0.00076 | 7.6 × 10⁻⁴ | 7.6E-4 |
| 602,000,000,000,000,000,000,000 | 6.02 × 10²³ | 6.02E23 |
What is E notation?
E replaces “× 10 to the power.” It is a display format, not Euler's number: 3.4E-5 means 3.4 × 10⁻⁵. To enter it correctly on a calculator, see scientific notation on a calculator.
Scientific versus engineering notation
Scientific notation keeps one non-zero digit before the decimal. Engineering notation instead requires an exponent divisible by 3, which aligns with metric prefixes. For example, 45,000 is 4.5 × 10⁴ scientifically and 45 × 10³ in engineering notation.
Frequently asked questions
Does “standard form” always mean scientific notation?
No. In UK school mathematics it commonly does; in US usage it can mean an ordinary decimal. This converter displays both.
Can the coefficient be 10?
Not in normalized scientific notation. Rewrite 10 × 10³ as 1 × 10⁴.
Does the converter round the number?
It preserves the entered decimal digits while reorganizing their position. It does not invent additional significant figures.