Scientific 1.234 × 10⁶ Engineering 1.234 × 10⁶ E-notation 1.234e6
About Scientific Notation Converter (Standard Form Calc)
Scientific notation (also called standard form) writes a number as a mantissa between 1 and 10 multiplied by a power of ten — so 1,234.5 becomes 1.2345 × 10³ and 0.00012 becomes 1.2 × 10⁻⁴. It's the compact way scientists, engineers, and spreadsheets express values that are otherwise too long to read, from atomic masses to astronomical distances.
This free scientific notation converter turns any number into scientific and engineering notation (where the exponent is always a multiple of three, matching SI prefixes like kilo, mega, and micro), and converts a scientific string back to plain decimal. It works on string representations to preserve precision for very large and very small values, so digits are never lost to floating-point rounding.
Everything runs entirely in your browser. Nothing you type is uploaded, so it's safe for sensitive measurements and works completely offline.
Features
- Convert decimals to scientific and engineering notation, and back to decimal
- Engineering form keeps the exponent a multiple of 3 (SI-friendly)
- Precision-preserving string math for very large and very small numbers
- Accepts e-notation (1.5e3) and ×10 forms (1.5 × 10^3); fully offline
How to use
- Type a number — like 1234.5 — into the input pane.
- Keep "To Scientific" selected to see the scientific, engineering, and e-notation forms.
- Switch to "To Decimal" and paste a value such as 1.5e3 to expand it back to a plain number.
- Copy the result from the output pane, or clear and start again.
Frequently asked questions
What is the difference between scientific and engineering notation?
Both write a number as digits times a power of ten. Scientific notation keeps the mantissa between 1 and 10 (1.2345 × 10⁴). Engineering notation restricts the exponent to multiples of three (12.345 × 10³), which lines up with SI prefixes like kilo (10³), mega (10⁶), and micro (10⁻⁶).
Is scientific notation the same as standard form?
Yes. "Standard form" is the term commonly used in British and other education systems for what is called scientific notation elsewhere. Both mean a × 10ⁿ where 1 ≤ a < 10.
How do I read e-notation like 1.5e3?
The "e" means "times ten to the power of," so 1.5e3 is 1.5 × 10³ = 1500, and 1.2e-4 is 1.2 × 10⁻⁴ = 0.00012. This converter accepts e-notation as input and can expand it back to a plain decimal.
Will very large or very small numbers lose precision?
No. The converter does the conversion with string-based math instead of floating-point numbers, so every significant digit is preserved — even for values far beyond what a normal JavaScript number can hold exactly.
Does my data get sent anywhere?
No. All conversion happens locally in your browser. Your input never leaves your device, so the tool works offline and is safe for confidential figures.
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Everything runs locally in your browser — your input is never uploaded.