Scientific Tools

SI Prefix Converter

SI Prefixes precede standard units of measurement to indicate multiples or fractions of the units. They range from the colossal, like the size of the observable universe (Yotta-, Ronna-), to the subatomic quantum realm (Zepto-, Quecto-).

This professional converter covers the entire official range established by the International Bureau of Weights and Measures (BIPM), including the four new prefixes added in 2022: Quetta (10³⁰), Ronna (10²⁷), Ronto (10⁻²⁷), and Quecto (10⁻³⁰).

Macro Scale (Large)

Multiples

Micro Scale (Small)

Subdivisions

Understanding the Scale

The SI system scales by factors of 1000. Each step up or down represents a massive shift in scale.

  • Quetta (10³⁰): Used to measure the mass of planets, stars, and galaxies (e.g., Jupiter is approx 2 Qg).
  • Tera (10¹²): Common in computing data storage (Terabytes).
  • Nano (10⁻⁹): The scale of electronics chips and DNA strands.
  • Quecto (10⁻³⁰): Theoretical physics scale, approaching the Planck length limits.

References

How to Use This Converter

Convert across 60 orders of magnitude instantly.

1

Select Prefix

Find your starting unit. Large units (Kilo to Quetta) are on the left; small units (Milli to Quecto) are on the right.

2

Enter Value

Type the number. For example, enter “1” in Tera to see that it equals 1,000,000,000,000 in Base units.

3

Scientific Notation

The converter automatically uses scientific notation (e.g., 1e+30) for extremely large or small results to maintain readability.