Convert Nanograms to Quarters
Convert Nanograms (ng) to Quarters (qr) instantly and accurately.
Conversion Formula
qr = ng × 7.873652221e-14
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.
About Quarters
A quarter (qr) in the avoirdupois system equals 28 pounds or one quarter of a hundredweight - approximately 12.70 kg. Historically, quarters were used in British trade for measuring grain, wool, and other bulk commodities. The British quarter of grain (28 lb) was the standard purchase quantity at markets and mills throughout medieval and early modern England. In the US, the term 'quarter' sometimes refers to a quarter of a short hundredweight (25 lb) rather than the British 28 lb.
Quick Reference Table
| Nanograms (ng) | Quarters (qr) |
|---|---|
| 1 ng | 7.874 × 10-14 qr |
| 2 ng | 1.575 × 10-13 qr |
| 5 ng | 3.937 × 10-13 qr |
| 10 ng | 7.874 × 10-13 qr |
| 25 ng | 1.968 × 10-12 qr |
| 50 ng | 3.937 × 10-12 qr |
| 100 ng | 7.874 × 10-12 qr |