Scientific Notation Converter
Convert between decimal and scientific notation with our free online calculator. Transform large or small numbers to/from scientific notation, engineering notation, and E-notation. Essential for scientists, engineers, and students.
Frequently asked questions
Scientific notation expresses numbers as a coefficient between 1 and 10 multiplied by a power of 10. For example, 6,500,000 = 6.5 × 10^6 and 0.00042 = 4.2 × 10^-4. It makes very large or small numbers easier to work with.
Engineering notation is similar to scientific notation but uses exponents that are multiples of 3 (10^3, 10^6, 10^9, etc.). This aligns with SI prefixes like kilo, mega, and giga, making it practical for engineering applications.
E-notation is a computer-friendly form of scientific notation. Instead of × 10^, it uses 'E' or 'e'. For example, 1.5 × 10^6 is written as 1.5E6 or 1.5e6. Most calculators and programming languages use this format.
Move the decimal point until you have a number between 1 and 10. Count how many places you moved it - this is your exponent. Moving left gives a positive exponent; moving right gives negative. For example: 4500 → 4.5 × 10^3.
Multiply the coefficients and add the exponents. For example: (2 × 10^5) × (3 × 10^4) = (2 × 3) × 10^(5+4) = 6 × 10^9. If the coefficient is not between 1-10, adjust by moving the decimal point and changing the exponent.
Divide the coefficients and subtract the exponents. For example: (8 × 10^7) ÷ (2 × 10^3) = (8 ÷ 2) × 10^(7-3) = 4 × 10^4. Always ensure the final coefficient is between 1 and 10.
Use scientific notation for very large numbers (like astronomical distances: 93 million miles = 9.3 × 10^7 mi) or very small numbers (like atomic sizes: 0.0000000001 m = 1 × 10^-10 m). It makes calculations easier and reduces errors from counting zeros.
They mean exactly the same thing - both represent multiplication by 1000. × 10^3 is traditional mathematical notation, while E3 or e3 is computer/calculator notation. So 2.5 × 10^3 = 2.5E3 = 2500.
Move the decimal point right for positive exponents or left for negative exponents. For 3.7 × 10^4, move right 4 places: 37000. For 5.2 × 10^-3, move left 3 places: 0.0052. Add zeros as needed to fill positions.
Engineering notation uses exponents of 3 (10^3, 10^6, 10^9) because they align with SI prefixes: kilo (10^3), mega (10^6), giga (10^9). This makes it easier to communicate values with engineers and match standard measurement units like kilowatts or megabytes.