Scientific Notation Converter
Convert numbers between standard, scientific, engineering, and E-notation with significant-figure rounding.
About this tool
Enter any number — from subatomic scale (10⁻³⁵) to cosmological scale (10⁸⁶) — and instantly see it expressed in four equivalent notations: standard decimal, scientific notation (coefficient × 10^exponent), engineering notation (exponent restricted to multiples of 3, matching SI prefixes), and E-notation (1.23E6). Round the result to a chosen number of significant figures. Multiply or divide two numbers given in scientific notation directly, with the result shown in all four forms. A curated reference table of real-world quantities — atom radius, wavelength of visible light, Earth's mass, distance to the nearest star, number of atoms in a mole — provides context for extreme values.
How to use
- 1 Type any number (e.g. 0.0000123 or 45600000) into the input field.
- 2 Instantly see the scientific, engineering, E-notation, and standard forms.
- 3 Use the 'Significant Figures' slider to round the coefficient.
- 4 Scroll to the calculator, enter two numbers and choose × or ÷.
- 5 Click 'Calculate' to see the product or quotient in all four notations.
- 6 Check the reference table for real-world examples at extreme scales.
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