About

In biochemistry and pharmacology, calculating the correct concentration is a matter of life safety. Converting from ng/mL to µg/mL is a standard procedure when preparing serial dilutions or interpreting immunoassay results. A calculation error here represents a factor of 1000 difference in active ingredient, which can be fatal in a clinical setting.

This calculator is designed with safety buffers. It handles the division logic (1000 ng = 1 µg) and provides high-precision decimal output to reflect low concentrations accurately. It includes a reverse function and alerts users if inputs suggest an unusually high concentration that might indicate a unit mix-up.

Formulas

The volume unit (mL) remains constant. The conversion is purely based on mass prefixes.

C_(µg/mL) = C_(ng/mL)1000

Conversely:

C_(ng/mL) = C_(µg/mL) × 1000

Reference Data

Concentration (ng/mL)	Concentration (µg/mL)	Safety / Notes
10 ng/mL	0.01 µg/mL	Low concentration
500 ng/mL	0.5 µg/mL	Standard range
1,000 ng/mL	1.0 µg/mL	Equivalence point
5,000 ng/mL	5.0 µg/mL	High concentration
1,000,000 ng/mL	1,000 µg/mL	Stock solution (Verify input!)

Frequently Asked Questions

The denominator here is Milliliters (mL), not Liters (L). This means you are dividing the value by 1,000. In the µg/L conversion, the value stays the same. Confusing these two is a common error.

The tool displays up to 6 decimal places to ensure precision for very dilute solutions (e.g., 5 ng/mL = 0.005 µg/mL). It does not arbitrarily round, protecting the integrity of your data.

No. This tool converts mass/volume concentrations. Molarity (mol/L) requires the molecular weight of the substance. You would need a separate Molarity Calculator.