Engineering Notation Calculator

Your details

Single mode converts one number to all notation formats. Arithmetic mode applies an operation to two numbers first.
Enter any decimal number. Accepts scientific notation too (e.g. 6.5e4).
Choosing a unit appends it to the SI-prefixed output (e.g. 65 kV for voltage).
Number of significant figures to display in the mantissa.
Engineering notation
65.0 x 10^3

Mantissa x 10^n where n is a multiple of 3

SI-prefixed form65.0 k
Scientific notation6.50 x 10^4
E-notation6.50E+4
Decimal (expanded)65000
Engineering exponent3
Mantissa65

Result in engineering notation: 65.0 x 10^3

  • Engineering notation restricts the exponent to multiples of 3 (0, 3, 6, 9, ..., -3, -6, ...) so the result aligns directly with SI prefixes like kilo (10^3), mega (10^6), milli (10^-3) and micro (10^-6).
  • The engineering exponent here is 10^3, which corresponds to the SI prefix "kilo" (symbol: k).
  • Scientific notation allows any integer exponent, so the mantissa is always between 1 and 10. Engineering notation trades that restriction for prefix-alignment, giving mantissas between 1 and 999.9.

Next stepUse the SI-prefixed form when labeling circuit diagrams, data sheets, or scientific measurements, it is the format most engineers and scientists recognize instantly.

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