ug to ml Converter
To get 500 µg from a 100 µg/mL solution, you need 5 mL, because volume is mass divided by concentration.
Quick answer: Divide the mass in µg by the concentration in µg/mL. For example, 500 µg at 100 µg/mL is 5 mL, 250 µg at 50 µg/mL is 5 mL and 1,000 µg at 500 µg/mL is 2 mL.
The µg to mL formula
The volume in mL equals the mass in µg divided by the concentration in µg/mL.
A mass alone has no volume, so the concentration is always needed.
Take 500 µg at 100 µg/mL. 500 µg ÷ 100 µg/mL gives 5 mL.
Take 250 µg at 50 µg/mL. 250 µg ÷ 50 µg/mL gives 5 mL.
Why µg cannot become mL alone
A microgram measures mass and a millilitre measures volume, so you need a link between them. That link is the concentration, which is mass per volume (Wikipedia: Mass concentration (chemistry)).
Once you know µg per mL, the sum is one division. A micro prefix means one millionth of a gram (UNLV: Table of metric prefixes).
How to convert µg to mL step by step
- Read the mass you need in µg.
- Read the concentration in µg/mL.
- Divide the mass by the concentration.
- Multiply by 1,000 if you want µL.
Example 1: 500 µg at 100 µg/mL
- Start with 500 µg at 100 µg/mL.
- 500 µg ÷ 100 µg/mL = 5.
- The volume is 5 mL.
500 µg at 100 µg/mL = 5 mL
Example 2: 250 µg at 50 µg/mL
- Start with 250 µg at 50 µg/mL.
- 250 µg ÷ 50 µg/mL = 5.
- The volume is 5 mL.
250 µg at 50 µg/mL = 5 mL
Example 3: 1,000 µg at 500 µg/mL
- Start with 1,000 µg at 500 µg/mL.
- 1,000 µg ÷ 500 µg/mL = 2.
- The volume is 2 mL.
1,000 µg at 500 µg/mL = 2 mL
The three examples below use common masses and strengths.
Each one shows the sum in full.
µg to mL conversion table
| Mass and concentration | Volume (mL) | Volume (µL) |
|---|---|---|
| 10 µg at 1 µg/mL | 10 mL | 10,000 µL |
| 50 µg at 10 µg/mL | 5 mL | 5,000 µL |
| 75 µg at 25 µg/mL | 3 mL | 3,000 µL |
| 100 µg at 100 µg/mL | 1 mL | 1,000 µL |
| 200 µg at 50 µg/mL | 4 mL | 4,000 µL |
| 250 µg at 100 µg/mL | 2.5 mL | 2,500 µL |
| 500 µg at 100 µg/mL | 5 mL | 5,000 µL |
| 500 µg at 250 µg/mL | 2 mL | 2,000 µL |
| 1,000 µg at 100 µg/mL | 10 mL | 10,000 µL |
| 1,000 µg at 500 µg/mL | 2 mL | 2,000 µL |
| 2,500 µg at 500 µg/mL | 5 mL | 5,000 µL |
The highlighted row is the default of the calculator. The last column gives µL.
A quick mental shortcut for µg to mL
Ask how many strengths fit in the mass. For 500 µg at 100 µg/mL, 100 goes into 500 five times.
So the volume is 5 mL.
Drawing up a set mass
A protocol may call for a fixed mass of a compound. If the stock has a known strength, the sum gives the volume to draw.
Measure small volumes with a suitable pipette and check the sum twice.
mL or µL
Volumes under 1 mL are easier to read in µL. Multiply the mL answer by 1,000 to get µL.
For example, 0.25 mL is 250 µL.
Quick conversion answers
| Conversion | Result |
|---|---|
| 100 µg at 100 µg/mL | 1 mL |
| 500 µg at 100 µg/mL | 5 mL |
| 1,000 µg at 100 µg/mL | 10 mL |
| 250 µg at 500 µg/mL | 0.5 mL |
Where this conversion is used
Lab staff work out the volume of stock to draw for a set mass.
Students practise mass concentration sums.
Common mistakes to avoid
- Forgetting the concentration. A mass alone cannot give a volume.
- Mixing mg/mL and µg/mL. They differ by 1,000.
- Mixing mL and µL. 1 mL is 1,000 µL.
- Multiplying instead of dividing. Volume is mass over strength.
Related converters
More mass and strength pairs
20 µg at 10 µg/mL is 2 mL. 40 µg at 20 µg/mL is 2 mL. 60 µg at 30 µg/mL is 2 mL.
80 µg at 40 µg/mL is 2 mL. 120 µg at 60 µg/mL is 2 mL. 300 µg at 100 µg/mL is 3 mL.
600 µg at 200 µg/mL is 3 mL. 750 µg at 250 µg/mL is 3 mL. 1,500 µg at 500 µg/mL is 3 mL.
A note on lab values
This page does unit arithmetic only. It is not medical advice, so ask your lab or clinician about any result.
Reference ranges depend on the lab, the method and the person, so use the range printed on your own report.
Doubling and halving
If the mass doubles, the volume doubles. So 1,000 µg at 100 µg/mL needs 10 mL, where 500 µg needed 5 mL.
If the strength doubles, the volume halves. So 500 µg at 200 µg/mL needs 2.5 mL.
Use these rules to catch slips. A result that moves the wrong way points to a mistake.
Checking the answer
Multiply the mL answer by the strength. For 5 mL at 100 µg/mL you get 500 µg, the mass you started with.
Then divide by the mass. You should get 0.01 mL per µg back.
If either check fails, redo the division.
Reading the result in µL
5 mL is 5,000 µL, because 1 mL is 1,000 µL.
Report the unit that suits the size. Small volumes read better in µL, and large ones in mL.
Frequently asked questions
How do I convert µg to mL?
Divide the mass in µg by the concentration in µg/mL.
Why do I need a concentration?
Because µg is mass and mL is volume. The concentration links them.
How do I get µL instead?
Multiply the mL answer by 1,000.
What if my stock is in mg/mL?
Multiply the mg/mL by 1,000 to get µg/mL, then use this page.
Does it work for any substance?
Yes, if you know the concentration of that solution.
Is this medical advice?
No. It is arithmetic only. Ask your lab or clinician about any dose.
Sources
- UNLV: Table of metric prefixes (physics.unlv.edu)
- Wikipedia: Mass concentration (chemistry) (en.wikipedia.org)
