Convert Gigagram to Picogram
Convert gigagrams to picograms instantly. 1 gigagram = 1e+21 picogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Picogram to Gigagram converter for the reverse conversion.
Units explained
Gigagram
A gigagram (Gg) equals 10^6 kilograms, the same as 1,000 metric tons.
From the SI prefix 'giga-' (from Greek 'gigas', giant).
Bulk commodity, emissions, and freight accounting.
The giga- prefix entered the SI in 1960.
Picogram
A picogram (pg) equals 10^-15 kilogram.
From the SI prefix 'pico-' (from Spanish 'pico', a small quantity).
Single-cell biology and ultratrace chemical analysis.
The pico- prefix entered the SI in 1960.
Gigagram to Picogram conversion formula
The relationship between gigagrams and picograms:
To convert gigagrams to picograms, multiply the value in gigagrams by 1e+21. To reverse, multiply picograms by 1e-21.
How to use this converter
Type a value into the calculator. The result in picograms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Picogram to Gigagram converter for the reverse direction.
Step-by-step: convert gigagrams to picograms
- Write down the value in gigagrams (Gg).
- Multiply that value by the factor 1e+21.
- The product is the equivalent value in picograms (pg).
- To reverse, multiply the picogram value by 1e-21.
Worked examples
Example 1 — Convert 1 Gg to pg:
1 × 1e+21 = 1e+21 pg
Example 2 — Convert 100 Gg to pg:
100 × 1e+21 = 1e+23 pg
Gigagram to Picogram conversion table
Standard reference values for converting gigagrams to picograms:
| Gigagram [Gg] | Picogram [pg] |
|---|---|
| 0.01 | 1e+19 |
| 0.1 | 1e+20 |
| 1 | 1e+21 |
| 2 | 2e+21 |
| 3 | 3e+21 |
| 4 | 4e+21 |
| 5 | 5e+21 |
| 10 | 1e+22 |
| 20 | 2e+22 |
| 30 | 3e+22 |
| 40 | 4e+22 |
| 50 | 5e+22 |
| 100 | 1e+23 |
| 500 | 5e+23 |
| 1000 | 1e+24 |
Frequently asked questions
How many picograms is 1 gigagram?
How do I convert gigagrams to picograms?
How do I convert picograms back to gigagrams?
How many picograms is 100 gigagrams?
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Metric / SI (17 units)
Avoirdupois (15 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 Gg = 1e+21 pg) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.