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Metric Prefixes Converter

Science

Convert any quantity between metric (SI) prefixes — from yotta to yocto — kilo, mega, milli, micro, nano, and more, instantly and quantity-independent.

Reviewed by the thecalcu.com team · Last updated July 3, 2026

From
To
All conversionsfor 1 Kilo (k) — 10³
Yotta (Y) — 10²⁴1.0000e-21
Zetta (Z) — 10²¹1.0000e-18
Exa (E) — 10¹⁸1.0000e-15
Peta (P) — 10¹⁵1.0000e-12
Tera (T) — 10¹²1.0000e-9
Giga (G) — 10⁹0.000001
Mega (M) — 10⁶0.001
Kilo (k) — 10³1
Hecto (h) — 10²10
Deca (da) — 10¹100
Base Unit — 10⁰1000
Deci (d) — 10⁻¹10000
Centi (c) — 10⁻²100000
Milli (m) — 10⁻³1000000
Micro (µ) — 10⁻⁶1000000000
Nano (n) — 10⁻⁹1000000000000
Pico (p) — 10⁻¹²1.0000e+15
Femto (f) — 10⁻¹⁵1.0000e+18
Atto (a) — 10⁻¹⁸1.0000e+21
Zepto (z) — 10⁻²¹1.0000e+24
Yocto (y) — 10⁻²⁴1.0000e+27

What is a Metric Prefixes?

The Metric Prefixes Converter converts between the standard SI (International System of Units) prefixes, from yotta (10²⁴) down to yocto (10⁻²⁴), independent of any specific physical quantity. Metric prefixes like kilo, mega, milli, and micro attach to any base unit (grams, metres, watts, bytes, volts) and always scale by the same power-of-ten relationship, which is what makes this converter useful across any field that uses SI units.

Enter a value in any prefix and the converter calculates the equivalent instantly. For unit-specific converters that already include the most common prefixes built in, see the Data Storage Converter, Electric Current Converter, or Electric Potential Converter.

Why Use a Metric Prefixes Converter?

Scientific and engineering work constantly moves between scales, a measurement in nanometres needs comparing against a spec in micrometres, or a kilowatt rating needs converting to watts for a formula. Since the relationship between any two SI prefixes is always a clean power of ten, this converter provides a single, reliable reference for that scaling regardless of what unit you're actually measuring.

It's especially useful when you're working with an unfamiliar or less common prefix (hecto, deca, zepto, yotta) and want to quickly confirm the exact multiplier before applying it to your specific calculation.

Who Should Use This Converter?

  • Students across science and engineering disciplines converting between SI prefixes as part of any unit conversion, regardless of the specific quantity involved.
  • Engineers and technicians working with datasheets or specifications that use different prefix scales for the same underlying unit.
  • Researchers in physics, astronomy, and chemistry working with extreme-scale prefixes (yotta, zepto) that don't come up in everyday contexts.
  • Anyone double-checking a decimal-point shift when converting between adjacent SI prefixes like kilo and mega, or milli and micro.

What Insights Does the Metric Prefixes Converter Give You?

The main output is the converted value in your chosen target prefix, calculated precisely from the fixed power-of-ten relationship between any two prefixes. Because this converter is quantity-independent, the result applies identically whichever physical unit you're actually working with, grams, metres, watts, or anything else.

How to use this Metric Prefixes calculator

  1. Choose your starting prefix from the source dropdown, for example, "Kilo (k), 10³".
  2. Enter the numeric value you want to convert in the input field.
  3. Choose your target prefix from the destination dropdown, for example, "Mega (M), 10⁶".
  4. Read the converted result, which updates instantly as you type or change units.
  5. Use the swap (⇅) button if you need to reverse the conversion direction.
  6. Apply the result to whatever specific unit (grams, watts, bytes, etc.) your calculation involves.
Show formula & methodology ↓Show less ↑

Formula & Methodology

The converter's base unit is the unprefixed base unit (10⁰). Every SI prefix has a fixed power-of-ten multiplier to the base unit, from yotta (10²⁴) down to yocto (10⁻²⁴), following the standard SI prefix table.

Any conversion follows:

Result = Input × (toBase of source prefix ÷ toBase of target prefix)

Worked example, converting 2,500 kilo (10³) to mega (10⁶):

Result = 2,500 × (1,000 ÷ 1,000,000) = 2.5

This confirms the standard relationship that 1,000 of something at the kilo scale equals 1 of that same something at the mega scale, for example, 2,500 kilograms equals 2.5 megagrams (metric tonnes).

Frequently Asked Questions

What are metric (SI) prefixes?
Metric prefixes are standardised multipliers, like kilo, mega, milli, and micro, that attach to any base unit to express very large or very small quantities without writing out long strings of zeros. A kilogram is 1,000 grams, a millimetre is 0.001 metres, and the same kilo/milli relationship applies whether the base unit is grams, metres, bytes, or watts.
How do I convert kilo to mega?
Divide by 1,000, since mega (10⁶) is 1,000 times larger than kilo (10³). Enter your value with 'Kilo' as the source and 'Mega' as the target and the converter applies this automatically.
Why is this converter quantity-independent?
Metric prefixes work the same way regardless of what they're attached to, the relationship between kilo and mega is identical whether you're converting kilograms to megagrams or kilowatts to megawatts, so this converter handles the prefix scaling only, leaving you to attach whatever unit applies to your specific quantity.
What is the difference between milli and micro?
Milli represents 10⁻³ (one-thousandth), while micro represents 10⁻⁶ (one-millionth), micro is a thousand times smaller than milli. This is the same thousand-fold relationship that exists between every adjacent pair of the standard SI prefixes.
What are the largest and smallest SI prefixes?
Yotta (10²⁴) is the largest standard SI prefix and yocto (10⁻²⁴) is the smallest, though these extreme prefixes are rarely used outside of specialised scientific and astronomical contexts. Most everyday and engineering use stays within nano to giga.
Why do some prefixes like hecto and deca see so little everyday use?
Hecto (10²) and deca (10¹) fall between the base unit and kilo, a range that most fields skip in favour of jumping straight from the base unit to kilo, since a factor of 100 or 10 rarely needs its own dedicated prefix in practice. They remain part of the standard SI system and do appear in specific contexts, like hectopascals for atmospheric pressure.
How does this relate to the Data Storage Converter?
The [Data Storage Converter](/data-storage-converter/) applies these same prefix relationships specifically to bytes (kilobytes, megabytes, gigabytes), though digital storage sometimes uses binary-based prefixes (1024-based) instead of the decimal (1000-based) SI prefixes covered here, check which convention your context uses.
Can I use this converter for electrical units like volts or amps?
Yes, the same kilo/milli/micro relationships apply to volts, amps, watts, or any other unit; use this converter to handle the prefix scaling, then apply it to your specific electrical quantity. See the [Electric Current Converter](/electric-current-converter/) and [Electric Potential Converter](/electric-potential-converter/) for unit-specific versions with the common electrical prefixes already built in.
Why do scientific fields like astronomy or particle physics need such extreme prefixes?
Astronomical distances and masses can reach the yotta (10²⁴) scale, while particle physics measurements can require the yocto (10⁻²⁴) scale, these fields work with quantities so far outside everyday experience that the full range of SI prefixes becomes genuinely necessary rather than just a formality.
Is there a difference between SI prefixes and binary prefixes used in computing?
Yes, standard SI prefixes are decimal (kilo = 1,000), while computing sometimes uses binary prefixes (kibi = 1,024) to reflect how memory is actually addressed in powers of two. This converter covers the decimal SI prefixes; see the [Data Storage Converter](/data-storage-converter/) for both conventions applied to bytes.
Also known as
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