Convert U/mL to ng/mL or solve enzyme activity and specific activity using a substance- and assay-specific U/mg value, with common laboratory units.

Required: activity concentration and substance-specific activity.

There is no universal U-to-ng conversion. Use the U/mg value from the same substance, product lot, reference standard, and assay definition.

Activity concentration

Substance-specific activity

Use the stated potency or specific activity for the exact material and assay. U and IU are only interchangeable when the source defines them that way.

For calculation and laboratory planning only. Do not use this converter to change a clinical dose or interpret a laboratory result without the product documentation, assay method, and qualified professional review.

U/Ml to Ng/Ml Conversion Formula

The following formula is used to convert U/ml to ng/ml.

ng / ml = (U / ml) × 1 000 000 ÷ (U / mg)

Variables:

  • U/ml is the concentration of enzyme activity in Units per milliliter.
  • ng/ml is the concentration in nanograms per milliliter.
  • U/mg is the specific activity

To convert U/ml to ng/ml, multiply the enzyme activity (U/ml) by 10^6 times the specific activity.

U/mL to ng/mL Conversion Table (Selected Specific Activities)
Enzyme Activity (U/mL) ng/mL @ 50 U/mg ng/mL @ 100 U/mg ng/mL @ 250 U/mg ng/mL @ 500 U/mg ng/mL @ 1000 U/mg
0.12000.0001000.000400.000200.000100.000
0.24000.0002000.000800.000400.000200.000
0.510000.0005000.0002000.0001000.000500.000
120000.00010000.0004000.0002000.0001000.000
240000.00020000.0008000.0004000.0002000.000
5100000.00050000.00020000.00010000.0005000.000
10200000.000100000.00040000.00020000.00010000.000
15300000.000150000.00060000.00030000.00015000.000
20400000.000200000.00080000.00040000.00020000.000
25500000.000250000.000100000.00050000.00025000.000
30600000.000300000.000120000.00060000.00030000.000
40800000.000400000.000160000.00080000.00040000.000
501000000.000500000.000200000.000100000.00050000.000
751500000.000750000.000300000.000150000.00075000.000
1002000000.0001000000.000400000.000200000.000100000.000
1503000000.0001500000.000600000.000300000.000150000.000
2004000000.0002000000.000800000.000400000.000200000.000
2505000000.0002500000.0001000000.000500000.000250000.000
50010000000.0005000000.0002000000.0001000000.000500000.000
100020000000.00010000000.0004000000.0002000000.0001000000.000
* Rounded to 3 decimals. Formula: ng/mL = (U/mL × 1,000,000) / (U/mg). Columns show ng/mL at the listed specific activities (U/mg). Note: 1 µg/mL = 1,000 ng/mL; 1 pg/mL = 0.001 ng/mL.

What is U/Ml to Ng/Ml Conversion?

U/ml to ng/ml conversion is a process of converting the activity of an enzyme, which is measured in Units per milliliter, to its mass concentration in nanograms per milliliter. This conversion is necessary when working with enzyme assays and biochemical calculations where both activity and mass concentration are relevant.

How to Calculate U/Ml to Ng/Ml?

The following steps outline how to convert U/ml to ng/ml.

  1. First, determine the enzyme activity in Units per milliliter (U/ml).
  2. Next, determine the molecular weight of the enzyme in Daltons (Da).
  3. Use the formula ng/ml = U/ml * MW to calculate the concentration in ng/ml.
  4. Finally, enter the values into the calculator above to verify the result.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Enzyme activity (U/ml) = 2 U/ml

Molecular weight (MW) = 50000 Da