Mass concentration.
Micrograms per Liter to Milligrams per Microliter Converter — ug/L to mg/uL
Convert Microgram per Liter (ug/L) to Milligram per Microliter (mg/uL) using the exact conversion factor (1 microgram per liter = 1e-9 milligram per microliter). See the formula, worked examples, and conversion table.
Micrograms per Liter to Milligrams per Microliter converter
Converter
Chemistry Converter
Convert concentration, molarity, amount, and laboratory scientific units by compatible family.
Context values
Some unit families need one extra value for a physically accurate result.
Mass concentration.
Result = input x 1e-6 / 1000.
Mass Concentration units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Micrograms per Liter to Milligrams per Microliter
Microgram per Liter and Milligram per Microliter both measure mass concentration — how much of a substance is dissolved or dispersed in a given volume — a core calculation for preparing lab solutions, checking water quality against a regulatory limit, or formulating a pharmaceutical dose. Both are mass concentration units.
Formula
milligrams per microliter = micrograms per liter × 1e-9
This factor comes from each unit's defined relationship to the category's base unit: 1 microgram per liter equals 0.000001 base units, and 1 milligram per microliter equals 1000 base units, so dividing one by the other gives the direct microgram per liter-to-milligram per microliter factor of 1e-9.
Simple example
1 ug/L × 1e-9 = 1e-9 mg/uL
1 microgram per liter = 1e-9 milligrams per microliter.
Real-world example
100 ug/L × 1e-9 = 1e-7 mg/uL
100 micrograms per liter = 1e-7 milligrams per microliter.
Conversion table
| Microgram per Liter (ug/L) | Milligram per Microliter (mg/uL) |
|---|---|
| 0.001 ug/L | 1e-12 mg/uL |
| 0.01 ug/L | 1e-11 mg/uL |
| 0.1 ug/L | 1e-10 mg/uL |
| 1 ug/L | 1e-9 mg/uL |
| 10 ug/L | 1e-8 mg/uL |
| 100 ug/L | 1e-7 mg/uL |
Reverse conversion: Milligram per Microliter to Microgram per Liter
1e-9 mg/uL × 1000000000 = 1 ug/L
1e-9 milligrams per microliter = 1 microgram per liter.
micrograms per liter = milligrams per microliter × 1000000000
For a page dedicated to this direction, see Milligram per Microliter to Microgram per Liter.
Understanding the Microgram per Liter (ug/L)
Mass concentration.
Understanding the Milligram per Microliter (mg/uL)
Mass concentration.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrams per microliter are in 1 microgram per liter?
1 microgram per liter equals 1e-9 milligrams per microliter, using the exact defined conversion factor rather than an estimate.
How do I convert microgram per liter to milligram per microliter?
Multiply the microgram per liter value by 1e-9. The converter above does this instantly to whatever precision you set.
How do I convert milligram per microliter back to microgram per liter?
Use the reverse factor: 1 milligram per microliter equals 1,000,000,000 micrograms per liter. You can also use the swap control in the converter above to flip the direction instantly.
What is a microgram per liter?
Microgram per Liter (ug/L) is a unit of chemistry.
What is a milligram per microliter?
Milligram per Microliter (mg/uL) is a unit of chemistry.
Is the microgram per liter to milligram per microliter conversion exact?
Yes. Both microgram per liter and milligram per microliter are defined by fixed standards rather than physical artifacts, so the factor of 1e-9 used above is exact to as many digits as you choose to display.
What's the difference between mass concentration and molarity?
Mass concentration expresses how much mass of a substance is present per unit volume (for example, grams per liter). Molarity expresses the amount in moles per liter instead, which accounts for the substance's molecular weight. This category converts mass-concentration units.