Convert Grains to Nanograms
Convert Grains (gr) to Nanograms (ng) instantly and accurately.
Conversion Formula
ng = gr × 64798910
About Grains
A grain (gr) is the smallest unit in both the avoirdupois and troy weight systems, equal to exactly 64.79891 milligrams. Originally defined as the mass of a single grain of barley or wheat from the middle of an ear, it has been a standard of weight since ancient times. Today, grains are used to weigh gunpowder charges and bullets (a standard .308 rifle bullet weighs 168 gr), pharmaceutical preparations in apothecary compounding, and the fineness of gold alloys. Arrowhead and fishing hook weights are also specified in grains.
About Nanograms
A nanogram (ng) is one billionth of a gram (10⁻⁹ g). This is the standard mass unit in analytical chemistry, pharmacology, and toxicology for detecting trace substances. Blood plasma concentrations of hormones, drugs, and environmental contaminants are routinely reported in nanograms per milliliter (ng/mL). A typical therapeutic blood level for many medications is in the range of 10-500 ng/mL. In forensic science, nanogram-level DNA quantities can be amplified by PCR to yield a full genetic profile.
Quick Reference Table
| Grains (gr) | Nanograms (ng) |
|---|---|
| 1 gr | 64798900 ng |
| 2 gr | 129598000 ng |
| 5 gr | 323995000 ng |
| 10 gr | 647989000 ng |
| 25 gr | 1.62 × 109 ng |
| 50 gr | 3.24 × 109 ng |
| 100 gr | 6.48 × 109 ng |