Micromolar to PPM Calculator

Convert concentration from micromolar (µM) to parts per million (ppm) using molar mass. Perfect for chemistry labs, water quality testing, and pharmaceutical calculations.

Concentration Converter:

Micromolar (µM) measures molar concentration, while ppm represents mass concentration. This calculator uses molar mass to convert between them.

µM to PPM Converter

Micromolar concentration value

Molecular weight of the substance

For non-aqueous solutions

Formula: ppm = (µM × Molar Mass) ÷ 1000

Calculation Results

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Enter concentration and molar mass

then click "Calculate" for results

What is a Micromolar to PPM Calculator?

In laboratory work, concentrations are often expressed in micromolar (µM), especially in chemistry and biology. However, environmental reports and water testing commonly use ppm. Converting between these two units requires one key value: molar mass.

Micromolar measures the number of micromoles per liter. PPM, in water-based solutions, represents milligrams per liter. Because 1 mg/L is approximately equal to 1 ppm in dilute water solutions, the conversion becomes manageable once you know the molecular weight.

Formulas Used in This Calculator

µM to PPM (Water Solution)
ppm = (µM × Molar Mass) ÷ 1000
Assumes density = 1 g/mL (water)
PPM to µM
µM = (ppm × 1000) ÷ Molar Mass
Reverse calculation to find molar concentration
With Density Correction
ppm = (µM × Molar Mass) ÷ (1000 × Density)
Use for non-aqueous solutions with different densities

Example Calculation

Problem: Convert 500 µM of sodium chloride (NaCl) to ppm. Molar mass of NaCl = 58.44 g/mol.
Step 1: Apply formula: ppm = (µM × Molar Mass) ÷ 1000
Step 2: ppm = (500 × 58.44) ÷ 1000
Step 3: ppm = 29,220 ÷ 1000
Result: 29.22 ppm

µM to PPM Reference Table

Here's a reference table showing various concentration conversions:

µM Substance Molar Mass PPM
100 NaCl 58.44 g/mol 5.844
500 NaCl 58.44 g/mol 29.22
1000 NaCl 58.44 g/mol 58.44
200 Glucose 180.16 g/mol 36.03
500 Glucose 180.16 g/mol 90.08
100 CaCO₃ 100.09 g/mol 10.01
250 CaCO₃ 100.09 g/mol 25.02
50 NaOH 40.00 g/mol 2.00
200 NaOH 40.00 g/mol 8.00
150 KCl 74.55 g/mol 11.18
300 KCl 74.55 g/mol 22.37
75 MgSO₄ 120.37 g/mol 9.03
400 MgSO₄ 120.37 g/mol 48.15
10 Glucose 180.16 g/mol 1.80
50 Glucose 180.16 g/mol 9.01
1000 Glucose 180.16 g/mol 180.16
2500 NaCl 58.44 g/mol 146.10
5000 CaCO₃ 100.09 g/mol 500.45
25 NaOH 40.00 g/mol 1.00
750 KCl 74.55 g/mol 55.91
Pro Tip:

For non-aqueous solutions or concentrated samples, use the density correction feature. The default water density (1.0 g/mL) works well for dilute solutions but may introduce small errors in concentrated or organic solvent solutions.