Scientific Notation Converter
Convert numbers to and from scientific and engineering notation, count significant figures and round to any s.f.
Result
How to use
- 1
Type a number in any form — ordinary, E notation or a × 10^n.
- 2
Choose how many significant figures to round to.
- 3
See scientific, engineering and decimal forms and the SI prefix.
Questions
What is scientific notation?
A number written as a × 10ⁿ where 1 ≤ |a| < 10. For example 1,50,000 = 1.5 × 10⁵ and 0.00042 = 4.2 × 10⁻⁴.
How is engineering notation different?
The power of ten is always a multiple of 3 so it matches SI prefixes — 45 × 10⁻⁶ is 45 µ (micro), 4.7 × 10³ is 4.7 k (kilo).
Which zeros are significant figures?
Non-zero digits always count. Zeros between them count (1005 has 4). Leading zeros never count (0.0042 has 2). Trailing zeros count only after a decimal point (2.50 has 3); in 1500 they are ambiguous — write 1.50 × 10³ to show 3 s.f.
About this Sci Notation tool
Scientific Notation Converter — Convert numbers to and from scientific and engineering notation, count significant figures and round to any s.f. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Type a number in any form — ordinary, E notation or a × 10^n.
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Results are estimates to help you plan. They are not financial, tax or medical advice.