Scientific Notation Converter
Convert decimal ↔ scientific notation, engineering notation, SI prefixes & science constants
About Scientific Notation
What is Scientific Notation?
Scientific notation expresses numbers as a coefficient (1 ≤ |c| < 10) multiplied by a power of 10. For example, 299,792,458 m/s → 2.998 × 108.
Engineering Notation
Engineering notation restricts exponents to multiples of 3, aligning with SI prefixes (nano, micro, milli, kilo, mega, giga…). Widely used in electronics and physics.
Significant Figures
The coefficient in scientific notation controls precision. 3.00 × 108 has 3 significant figures while 3 × 108 has only 1. Choose sig figs to match your measurement precision.
E-notation
E-notation (2.998e8) is the computer-friendly version of scientific notation, used in programming languages, spreadsheets, and calculators.
What is Scientific Notation Converter?
Scientific Notation Converter is a maths and science utility that converts numbers between standard decimal form, scientific notation, and engineering notation. It also identifies the appropriate SI prefix for any result expressed in engineering notation, making it easy to read off values like 4.7 kΩ or 2.2 µF directly.
Scientific notation expresses numbers as a coefficient multiplied by a power of ten: for example, 0.000045 becomes 4.5 x 10^-5. This format is standard in physics, chemistry, astronomy, and engineering because it makes very large and very small numbers easy to write, compare, and work with. Engineering notation is a variant where the exponent is always a multiple of three, aligning with SI prefixes like kilo (10^3), mega (10^6), giga (10^9), milli (10^-3), micro (10^-6), and nano (10^-9).
Understanding the difference between these notations matters in practical work. A resistor value of 4700 ohms is written as 4.7 kΩ in engineering notation, which directly maps to the colour band code on a physical component. A data transfer rate of 1,000,000,000 bits per second is 1 Gbit/s. Converting fluently between these forms is a routine skill in electronics, physics, and scientific data analysis.
This tool handles both directions of conversion — decimal to scientific and back — along with edge cases like zero, negative numbers, and numbers that are already expressed in scientific notation. It shows all three forms side by side so you can see exactly how they relate.
How to Use Scientific Notation Converter
- Enter your number
Type any decimal number, scientific notation value, or engineering notation expression into the input field.
- Choose conversion direction
Select whether you are converting from decimal to scientific notation or from scientific notation back to decimal.
- View all three forms
See the number expressed in standard decimal, scientific notation, and engineering notation with its SI prefix side by side.
- Copy the result
Copy any of the output forms to paste into a document, spreadsheet, or code file.
Key Benefits
Decimal, scientific, and engineering notation are shown simultaneously so you can see how a number looks in every standard form.
Engineering notation results include the corresponding SI prefix (kilo, mega, giga, milli, micro, nano) for immediate practical readability.
Results appear in real time as you type, with no form submission required.
The converter correctly handles zero, negative numbers, very large numbers, and numbers already in scientific notation form.
Frequently Asked Questions
In scientific notation the exponent can be any integer. In engineering notation the exponent is always a multiple of three, which aligns with SI prefixes like kilo, mega, and milli.
Type it using the letter E to represent the exponent: for example, type 4.5E-5 for 4.5 x 10^-5. The tool will parse and convert it automatically.
Nano (10^-9), micro (10^-6), milli (10^-3), kilo (10^3), mega (10^6), giga (10^9), and tera (10^12) cover the vast majority of everyday science and engineering values.
Yes. The converter uses JavaScript's number handling and can process values up to approximately 1.8 x 10^308 and as small as 5 x 10^-324 before hitting floating-point limits.