Enter any decimal, e.g. 0.000000045 or 6700000000000
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Ready to convert
Enter a number and click Convert// express numbers in e-notation or expand them back
Convert numbers to scientific notation, e-notation, or expand them back to decimal. Handles very large and very small numbers instantly in your browser.
Enter any decimal, e.g. 0.000000045 or 6700000000000
Ready to convert
Enter a number and click ConvertSelect "Number → Scientific" or "Scientific → Decimal" at the top.
Type a decimal like 0.000045 or e-notation like 1.5e-9.
See scientific notation, e-notation, engineering notation, and the full breakdown instantly.
This tool converts numbers between standard decimal form and scientific notation (or e-notation). Scientific notation expresses numbers as a coefficient × 10 raised to a power — essential in science, engineering, and computing when dealing with very large or very small values.
Scientific notation expresses a number as a product of a coefficient (between 1 and 10) and a power of ten. For example, 45,000 becomes 4.5 × 10⁴ and 0.0023 becomes 2.3 × 10⁻³. It makes very large and very small numbers easier to read and work with.
They represent the same value — e-notation is just the text-friendly version used in programming and calculators. Instead of 4.5 × 10⁴, e-notation writes it as 4.5e4. Both are fully interchangeable.
Engineering notation uses only exponents that are multiples of 3 (0, 3, 6, -3, -6), aligning with SI prefixes like kilo (10³), mega (10⁶), milli (10⁻³), and micro (10⁻⁶). It is standard in electrical engineering and physics.
Yes! You can type 1.5e10, 3.2e-4, or even 1.5*10^10 — the converter accepts multiple common formats and normalises them automatically before processing.
Extremely large numbers (exponents above 20) exceed standard floating-point precision. The tool provides the best PHP approximation, but for exact arbitrary-precision results a specialised big-number library is required.
No. Processing happens in real time via a lightweight PHP API and nothing is ever logged or saved. Your numbers remain completely private.
A scientific notation converter translates ordinary decimal numbers into the compact, standardised format used across physics, chemistry, engineering, computing, and mathematics. Instead of writing 602,200,000,000,000,000,000,000 (Avogadro's number), scientific notation gives you 6.022 × 10²³ — far easier to read, compare, and use in calculations.
This free online tool handles both directions: enter a raw decimal and get scientific notation, e-notation, and engineering notation simultaneously; or enter a value like 9.109e-31 and immediately see the full decimal expansion — all with one-click copy buttons.
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Scientific notation expresses any number in the form a × 10ⁿ, where a is a coefficient between 1 (inclusive) and 10 (exclusive), and n is an integer exponent. The exponent tells you how many places the decimal point must move:
E-notation (also called exponential notation) is the text-friendly equivalent used in programming languages, spreadsheets, and calculators. Because most keyboards and programming environments cannot type superscripts easily, 1.5 × 10⁴ is written as 1.5e4 or 1.5E4. You will see this constantly in Python, JavaScript, C++, Java, JSON payloads, and Excel cells that contain very large or small values.
Engineering notation restricts exponents to multiples of 3, aligning perfectly with the SI prefix system: kilo (10³), mega (10⁶), giga (10⁹), milli (10⁻³), micro (10⁻⁶), nano (10⁻⁹). So instead of writing 4.7 × 10⁴ ohms, an electrical engineer writes 47 × 10³ Ω — or simply 47 kΩ. Our converter shows the engineering form automatically alongside standard scientific notation.
Example: 0.00456 → move decimal 3 places right → coefficient 4.56 → exponent −3 → 4.56 × 10⁻³.
Most scientific calculators display one notation format at a time, and switching modes is cumbersome. This tool simultaneously shows scientific notation with Unicode superscripts (ready to paste into documents), e-notation (ready to paste into code), engineering notation aligned with SI prefixes, and the coefficient and exponent broken out separately. All with one-click copy — ideal for reports, code, spreadsheets, or academic papers.
Most programming languages support e-notation literals directly. In JavaScript, const c = 2.998e8; stores the speed of light. In Python, h = 6.626e-34 stores Planck's constant. When printing floats, many languages default to e-notation for extreme values — which is exactly when this converter helps you decode what you are looking at and verify the physical meaning behind the number.