Concentration Converter
Convert between molar concentration (M, mM, µM, nM) and mass concentration (mg/mL, µg/mL, ng/mL) using molecular weight. Pick a common reagent, type any formula, or enter the molecular weight from your bottle.
Compound and concentration
From formula NaCl. Use the exact form you weigh: hydrates and salts change the MW.
Results update as you type.
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Mass concentration
584.4µg/mL
10 mM at 58.44 g/mol
Every unit
| Unit | Value |
|---|---|
| M | 0.01 |
| mMyour input | 10 |
| µM | 10000 |
| nM | 1e+7 |
| mg/mL= g/L | 0.5844 |
| µg/mL= mg/L ≈ ppm | 584.4 |
| ng/mL= µg/L ≈ ppb | 5.844e+5 |
| % w/v g per 100 mL | 0.05844 |
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Formula reference
Molar → mass:
mg/mL = M × MWMass → molar:
M = (mg/mL) ÷ MWPercent:
% w/v = (mg/mL) ÷ 10- MW is in g/mol (numerically equal to Da). 1 M × MW g/mol = MW g/L = MW mg/mL.
- ppm and ppb equivalents assume a dilute aqueous solution with a density of about 1 g/mL.
- Library molecular weights are calculated from each formula with standard atomic weights. Check your supplier's label for lot-specific values.