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The SI Prefixes Converter converts any value between all 20 official SI metric prefixes, from yocto (10⁻²⁴) to yotta (10²⁴). This universal tool works for any SI unit — meters, grams, watts, bytes, hertz, or any other quantity that uses metric prefixes.
The International System of Units (SI) defines 20 standard prefixes that can be applied to any base unit. These prefixes represent exact powers of 10, enabling a single base unit to cover measurements spanning 48 orders of magnitude from the subatomic scale to cosmological distances.
The most commonly used prefixes in everyday life are: kilo (k, 10³) for kilometers and kilograms, mega (M, 10⁶) for megabytes and megahertz, giga (G, 10⁹) for gigabytes and gigahertz, and milli (m, 10⁻³) for millimeters and milliliters. In science, nano (n, 10⁻⁹), pico (p, 10⁻¹²), and femto (f, 10⁻¹⁵) are essential for nanotechnology, electronics, and nuclear physics.
The newest SI prefixes are ronna (10²⁷) and quetta (10³⁰), adopted in 2022, along with ronto (10⁻²⁷) and quecto (10⁻³⁰). This converter covers the traditional 20 prefixes from yocto to yotta.
Our converter also shows the exponent difference between prefixes, making it easy to see that converting from micro to milli shifts the decimal point by 3 places (10³), while converting from nano to mega shifts by 15 places (10¹⁵).
The converter multiplies the input by the source prefix power of 10 to get the base unit value, then divides by the target prefix power of 10. For example, 5 km to mm: 5 x 10³ / 10⁻³ = 5 x 10⁶ = 5,000,000 mm. The scientific notation exponent shows the net power of 10 difference.
Memory aid for common prefixes: King Henry Died By Drinking Chocolate Milk (Kilo, Hecto, Deca, Base, Deci, Centi, Milli). For larger: Mega, Giga, Tera, Peta, Exa. For smaller: Micro, Nano, Pico, Femto, Atto.
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5 km = 5,000,000 mm (10⁶ difference)
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450 nm = 0.45 µm (blue light)
SI prefixes are standardized multipliers (powers of 10) that can be prepended to any SI unit. They range from yocto (10^-24) to yotta (10^24), covering 48 orders of magnitude.
There are currently 24 SI prefixes (20 traditional from yocto to yotta, plus 4 added in 2022: ronto, quecto, ronna, quetta). This converter covers the traditional 20.
Multiply or divide by the appropriate power of 10. The exponent difference between prefixes gives the number of decimal places to shift. For example, kilo to milli = 10^6 (shift 6 places right).
Yotta (Y) = 10^24 is the largest in this converter. The 2022 addition quetta (Q) = 10^30 is the largest official SI prefix.
Yocto (y) = 10^-24 is the smallest in this converter. The 2022 addition quecto (q) = 10^-30 is the smallest official SI prefix.
There are: deca (10^1), hecto (10^2), centi (10^-2), and deci (10^-1). However, above kilo and below milli, prefixes jump by factors of 10^3 for simplicity.
SI prefixes (kilo=1000, mega=10^6) technically apply to bytes, but computing traditionally used binary prefixes (kibi=1024, mebi=2^20). IEC introduced binary prefixes (KiB, MiB) to resolve this ambiguity.
The micro prefix uses the Greek letter mu: µ. In computing contexts where µ is unavailable, 'u' is often substituted (e.g., uF for microfarads).
No, SI rules prohibit stacking prefixes. You cannot write 'millikilogram' (mkg). Instead, use the appropriate single prefix or express in base units with scientific notation.
Common errors: confusing M (mega, 10^6) with m (milli, 10^-3) due to capitalization; using 'kilo' as 'K' instead of 'k'; applying SI prefixes to non-SI units inconsistently.
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