Metric Prefixes Converter

Convert values across all current SI metric prefixes from quecto and ronto through kilo, mega, yotta, ronna, and quetta.

Convert instantly

Enter a value and choose the units. Your answer updates as you type.

Value

From

Result

0.001 Ronto (r, 10⁻²⁷)

Quick reference

Quecto (q, 10⁻³⁰)1e-30 base units
Ronto (r, 10⁻²⁷)1e-27 base units
Yocto (y, 10⁻²⁴)1e-24 base units
Zepto (z, 10⁻²¹)1e-21 base units
Atto (a, 10⁻¹⁸)1e-18 base units
Femto (f, 10⁻¹⁵)1e-15 base units
Pico (p, 10⁻¹²)1e-12 base units

About the Metric Prefixes Converter

SI prefixes scale an underlying unit by a power of ten and do not change its dimension. This table includes the 2022 additions ronna, quetta, ronto, and quecto alongside familiar scientific and engineering prefixes. This page retains the standard SI relationship while keeping customary and legacy units explicit, which is important when a specification crosses disciplines.

Enter a value to see the conversion immediately—for example, 1 quetta-unit equals 10³⁰ base units, while 1 nano-unit equals 10⁻⁹ base units. For a related check, use the Data Storage Converter and Energy Converter; those tools describe a different but commonly connected quantity.

Frequently asked questions

What does the metric prefixes measure?

What is a useful reference conversion for metric prefixes?

1 quetta-unit equals 10³⁰ base units, while 1 nano-unit equals 10⁻⁹ base units.

Are the factors on this page exact?

SI prefixes and internationally defined units use their standard factors. Legacy and customary factors are retained at their published scientific definitions and may be rounded only for display.

Take this calculation further

Browse the converters calculators collection for more tools in this subject.

For a related calculation, use Data Transfer Converter to convert data transfer rates between bits per second, decimal and binary network rates, and bytes per second. Alternatively, use Data Storage Converter to convert data sizes between bits, bytes, decimal SI kilobytes, and binary IEC KiB, MiB, GiB, TiB, and PiB.

For the underlying method, read Understanding Data Storage Units: Why Your Drive Shows Less Space or Understanding Sound Decibels: Why the Scale Isn't Linear.