Concentration Converters
Convert between molar concentration units: mol/L (M), mmol/L (mM), µmol/L (µM), and nmol/L (nM). Critical for solution chemistry and biochemistry.
Concentration tells you how much solute is dissolved in a solution. Molarity (mol/L or M) is the standard unit in general chemistry, but biochemistry and pharmacology often use millimolar (mM), micromolar (µM), or nanomolar (nM) for dilute solutions. Converting between these scales is straightforward — they differ only by powers of 1000 — but getting the prefix wrong can mean a thousandfold error in your experiment.
108 Concentration Conversions
g/100mL to Percent w/v Converter
% w/v = g/100mL × 1
Convert g/100 mL to % w/v. The two units are numerically identical by definition — a percent w/v is nothing more than grams of solute per 100 mL of solution.
g/kg to PPM Converter
ppm = g/kg × 1000
Convert g/kg to ppm by multiplying by 1000. The factor falls cleanly out of 1 ppm = 1 g per 1,000,000 g = 1 mg/kg in any solid-matrix sample.
g/L to g/mL Converter
g/mL = g/L ÷ 1000
Convert g/L to g/mL by dividing by 1000. The decimal step that bridges bioreactor titer reports and the high-concentration density numbers downstream formulation runs in.
g/L to mg/mL Converter
mg/mL = g/L × 1 (numerically identical)
Convert g/L to mg/mL — numerically identical units. The 1000-fold scale-up in mass cancels the 1000-fold scale-up in volume.
g/L to Molarity Converter
M = g/L / MW (molar mass in g/mol)
Convert g/L to molarity by dividing by the molar mass. The standard step that turns a weighed-out concentration into the mol/L units stoichiometric calculations actually use.
g/L to Percent w/v Converter
% w/v = g/L ÷ 10
Convert g/L to % w/v by dividing by 10. The factor falls out of the % w/v definition: grams of solute per 100 mL of solution.
g/L to PPM Converter
ppm = g/L × 1000
Multiply by 1000. The factor only works cleanly because water-quality reports assume the solution density sits at roughly 1 g/mL — true for any dilute aqueous sample, false the moment you get into brines or concentrated acid.
g/mL to g/L Converter
g/L = g/mL × 1000
Convert g/mL to g/L by multiplying by 1000. The decimal step that bridges measured solution density and the per-liter form a molarity calculation reads in.
g/mL to kg/L Converter
kg/L = g/mL × 1 (numerically identical)
Convert g/mL to kg/L — numerically identical units. The 1000-fold scale-up in mass exactly cancels the 1000-fold scale-up in volume.
Grams per Liter to mg/L Converter
mg/L = g/L × 1000
Convert g/L to mg/L by multiplying by 1000. The clean prefix step between bench-stock concentrations and the mg/L units water-quality and trace-analysis reports use.
Grams per Liter to µg/L Converter
µg/L = g/L × 10⁶
Six prefix decades stand between g/L and µg/L. That's the gap between a bulk solution and the trace-level numbers ICP-MS reports — most of the conversion's work is just bookkeeping for the exponent.
kg/L to g/mL Converter
g/mL = kg/L × 1 (numerically identical)
Convert kg/L to g/mL — numerically identical units. The 1000-fold scale-up in mass exactly cancels the 1000-fold scale-up in volume.
mEq/L to mg/L Converter
mg/L = (mEq/L × atomic weight) ÷ valence
Convert mEq/L to mg/L by multiplying by atomic weight and dividing by valence. Comes up at the boundary of charge-based clinical electrolyte reporting and mass-based reagent specs.
mg/dL to mg/L Converter
mg/L = mg/dL × 10
Ten deciliters in a liter, so the conversion is just ×10. The everyday case is US clinical reporting (mg/dL) crossing into the SI mass-concentration units bioanalytical labs prefer (mg/L).
mg/dL to mmol/L Converter
mmol/L = (mg/dL × 10) / MW
US clinical labs report glucose, cholesterol, and creatinine in mg/dL; the rest of the world uses mmol/L. To bridge them, multiply by 10 (deciliter to liter) and divide by the analyte's molar mass.
mg/kg to Percent Converter
% = mg/kg ÷ 10000
Divide mg/kg by 10,000 to get percent w/w. Two scales of the same mass-fraction story: trace-contaminant data (mg/kg, ppm) on one side, bulk-composition reporting (%) on the other.
mg/kg to PPM Converter
ppm = mg/kg × 1 (mass/mass)
Convert mg/kg to ppm. The two are numerically identical for mass per mass analysis — the conversion is the bookkeeping step between analytical lab output and regulatory reporting.
mg/L to Grams per Liter Converter
g/L = mg/L / 1000
Convert mg/L to g/L by dividing by 1000. The clean prefix step that takes a trace-analysis result up to the bulk-preparation scale.
mg/L to mEq/L Converter
mEq/L = (mg/L × valence) ÷ atomic weight
Convert mg/L to mEq/L by multiplying by valence and dividing by atomic weight. Useful any time mass-based reagent specs and charge-based clinical electrolyte reporting have to agree.
mg/L to mg/dL Converter
mg/dL = mg/L ÷ 10
Convert mg/L to mg/dL by dividing by 10. The factor falls cleanly out of 1 dL = 0.1 L.
mg/L to Molarity Converter
mol/L = (mg/L) / (MW × 1000)
Convert mg/L to mol/L by dividing by (MW × 1000). Comes up at the boundary of mass-concentration analytical reports and the mol/L units stoichiometry actually uses.
mg/L to Percent Converter
% = mg/L × 0.0001
Convert mg/L to % w/v by dividing by 10,000. The factor falls cleanly out of the % w/v definition: g per 100 mL of solution.
mg/L to PPB Converter
ppb = mg/L × 1000
Convert mg/L to ppb by multiplying by 1000. For dilute aqueous solutions the equivalence is exact: 1 mg/L = 1 ppm = 1000 ppb.
mg/L to PPM Converter
ppm = mg/L × 1 (for dilute aqueous solutions)
Convert mg/L to ppm — an identity for dilute aqueous solutions, where the two labels describe the same concentration.
mg/L to µg/L Converter
µg/L = mg/L × 1000
Convert mg/L to µg/L by multiplying by 1000. The decimal step from bulk-source concentrations into the trace-level form environmental and clinical chemistry use.
mg/L to µg/mL Converter
µg/mL = mg/L × 1 (numerically identical)
Convert mg/L to µg/mL — numerically identical units. The 1000-fold scale-down in mass cancels the 1000-fold scale-down in volume.
mg/m³ to PPM (Air) Converter
ppm = (mg/m³ × 24.45) ÷ MW
Convert mg/m³ to ppm in air via ppm = (mg/m³ × 24.45) / MW. The 24.45 factor is the ideal-gas molar volume at 25 °C and 1 atm.
mg/mL to g/L Converter
g/L = mg/mL × 1 (numerically identical)
Convert mg/mL to g/L — numerically identical units. The 1000-fold scale-up in mass exactly cancels the 1000-fold scale-up in volume.
mg/mL to Percent w/v Converter
% w/v = (mg/mL) × 0.1
Convert mg/mL to % w/v by dividing by 10. The factor falls cleanly out of the % w/v definition: g per 100 mL of solution.
Micromolar to Millimolar Converter
mM = µM / 1000
Convert micromolar to millimolar — a thousand-fold step that sits between the assay plate and the stock bottle. Formula, worked examples, and a table of common values.
Micromolar to Molar Converter
M = µM / 1000000
Convert micromolar to molar by dividing by 10⁶. The million-fold step that takes assay-scale concentrations back into the bulk-stock units used for dilutions.
Micromolar to Nanomolar Converter
nM = µM × 1000
Convert micromolar to nanomolar by multiplying by 1000. The scale-up you need when a working concentration has to be compared against a tight binding constant.
Micromolar to Picomolar Converter
pM = µM × 10⁶
µM × 10⁶ = pM. Six orders of magnitude, mostly used when you need to talk about an early screening hit and a late-stage optimized lead in the same sentence.
Milliequivalents/L to mmol/L Converter
mmol/L = mEq/L ÷ valence
Convert mEq/L to mmol/L by dividing by the ion's valence. For monovalent ions the values are identical; for divalent the mmol figure is half.
Millimolar to Micromolar Converter
µM = mM × 1000
Convert millimolar to micromolar — a thousand-fold step you make every time a stock solution has to meet a working concentration. Formula, worked examples, and a table of common values.
Millimolar to Molar Converter
M = mM ÷ 1000
Convert millimolar to molar by dividing by 1000. The reverse of how most buffer recipes get written — drop the factor of 1000 when you need to plug into an equation that expects mol/L.
Millimolar to Molarity Converter
M = mM / 1000
Convert millimolar to molar concentration by dividing by 1000. The clean step between buffer-recipe values in mM and the M units stock-solution math expects.
Millimolar to Nanomolar Converter
nM = mM × 10⁶
Convert mM to nM by multiplying by 10⁶. A six-decade SI prefix jump between cell-culture buffer concentrations and lead-compound IC50 values.
Millimolar to Picomolar Converter
pM = mM × 10⁹
Convert mM to pM by multiplying by 10⁹. A jump of nine prefix decades, the gap between cell-buffer concentrations and the picomolar binding constants therapeutics target.
Milliosmolarity to Osmolarity Converter
Osm/L = mOsm/L ÷ 1000
Convert mOsm/L to Osm/L by dividing by 1000. The milli prefix step bridging clinical osmolality readings and the formal SI base unit.
mL/L to Percent v/v Converter
% v/v = mL/L ÷ 10
Convert mL/L to % v/v by dividing by 10. The factor falls cleanly out of the % v/v definition: mL of solute per 100 mL of solution.
mmol/L to mg/dL Converter
mg/dL = mmol/L × MW ÷ 10
Convert mmol/L to mg/dL via mg/dL = mmol/L × MW / 10. Used at the handoff between SI clinical-chemistry data into US-convention mass-based reporting.
mmol/L to Milliequivalents/L Converter
mEq/L = mmol/L × valence
Convert mmol/L to mEq/L by multiplying by ion valence. Used when SI clinical-chemistry data must meet the per-charge form bedside electrolyte management expect.
mol/(L·min) to mol/(L·s) Reaction Rate Converter
mol/(L·s) = mol/(L·min) ÷ 60
Convert reaction rates from per-minute to per-second by dividing by 60. The SI standard uses seconds, so the conversion is the routine step before publishing kinetics data.
mol/(L·s) to mol/(L·min) Reaction Rate Converter
mol/(L·min) = mol/(L·s) × 60
60 seconds in a minute — that's the whole conversion. Trivial arithmetic, but the bridge between fast transient-kinetics work (stopped-flow, T-jump) and steady-state biochemistry where Vmax is tabulated per minute.
Molar to Micromolar Converter
µM = M × 1000000
A factor of a million separates molar from micromolar. That's the gap between the M-scale stocks chemists keep on the bench and the µM concentrations actually used in assays and pharmacology.
Molar to Millimolar Converter
mM = M × 1000
Convert molar to millimolar by multiplying by 1000. The step that takes a concentrated stock down to a working buffer concentration — formula, examples, and a common-values table.
Molar to Millimolar Converter
mM = M × 1000
Convert molar to millimolar by multiplying by 1000. The decimal step from bottle-label stock concentrations to the mM working concentrations buffers and assays use.
Molar to Nanomolar Converter
nM = M × 10⁹
Convert molar to nanomolar by multiplying by 10⁹. The scale bridge between bench stock solutions and the low-nM concentrations where drug potency and receptor binding are reported.
Molar to Picomolar Converter
pM = M × 10¹²
Convert molar to picomolar by multiplying by 10¹². A jump of twelve orders of magnitude — from shelf-stock concentration down to the tightest binding regime that routinely gets measured.
Molarity to g/L Converter
g/L = M × MW (molar mass in g/mol)
Convert molarity to grams per liter by multiplying by the molar mass. The step that turns a mole-based recipe into the mass a balance has to weigh out.
Molarity to mg/L Converter
mg/L = mol/L × MW × 1000
Convert mol/L to mg/L by multiplying by molecular weight × 1000. Used when per-mole molar concentration must meet the mass-based form environmental and analytical chemistry expect.
Molarity to Moles Converter
moles = molarity (M) × volume (L)
Convert molarity and volume to moles via n = M × V. The core relationship behind solution preparation, titrations, and dilution math.
Molarity to Normality Converter
N = M × n (where n depends on the reaction)
Convert molarity to normality for acid-base and redox titrations. Normality is molarity weighted by the number of equivalents — n per H⁺, OH⁻, or electron transferred.
Molarity to PPM Converter
ppm = M × MW × 1000 (for dilute aqueous solutions)
Convert molarity to ppm by multiplying by molar mass and 1000. A unit step between bench-scale mol/L concentrations and the ppm units water-quality and trace-analysis reports use.
Moles to Molarity Converter
M = mol / V (L) — molarity needs a solution volume; this is not a pure unit conversion
This isn't strictly a unit conversion — molarity is moles divided by liters of solution. Use this when you have moles plus a target volume and want the resulting concentration.
Nanomolar to Micromolar Converter
µM = nM / 1000
Convert nanomolar to micromolar — a clean division by 1000 that bridges pharmacology potency work and routine enzyme assays. Formula, worked examples, and a common-values table.
Nanomolar to Millimolar Converter
mM = nM × 10⁻⁶
Convert nanomolar to millimolar by dividing by 10⁶. The factor of a million between trace pharmacology values and the mM concentrations buffers and substrates run at.
Nanomolar to Molar Converter
M = nM × 10⁻⁹
Convert nanomolar to molar by dividing by 10⁹. The step that moves a pharmacology or biochemistry number back into the units used for stock solutions and Beer-Lambert work.
Nanomolar to Picomolar Converter
pM = nM × 1000
Convert nM to pM by multiplying by 1000. The decimal step bridging mid-stage drug-candidate IC50 values and the picomolar Kd of fully optimized binders.
ng/g to PPB Converter
ppb = ng/g × 1
Convert ng/g to ppb. The two units are numerically identical for mass per mass measurements — the conversion is the bookkeeping step between analytical lab output and regulatory reporting.
ng/mL to µg/L Converter
µg/L = ng/mL × 1 (numerically identical)
Convert ng/mL to µg/L — numerically identical units. The 1000-fold scale-up in mass cancels the 1000-fold scale-up in volume.
Normality to Molarity Converter
M = N ÷ n (where n depends on the substance and reaction)
Convert normality to molarity by dividing by the equivalence factor n. The reverse direction of the acid-base or redox scaling that normality was built around.
Osmolarity to Milliosmolarity Converter
mOsm/L = Osm/L × 1000
Convert Osm/L to mOsm/L by multiplying by 1000. The milli prefix step bridging the formal SI unit and the clinical mOsm/L convention.
Parts per Billion to Percent Converter
% = ppb × 10⁻⁷
Convert ppb to percent by multiplying by 10⁻⁷. Seven prefix decades sit between trace-impurity reports and bulk-purity specifications.
Parts per Trillion to PPB Converter
ppb = ppt × 0.001
Convert ppt to ppb by dividing by 1000. The decimal step bridging modern PFAS measurements and pre-2020 trace-contaminant literature.
Parts per Trillion to PPM Converter
ppm = ppt × 10⁻⁶
Convert ppt to ppm by multiplying by 10⁻⁶. The six-decade gap separating semiconductor-grade ultrapure water and bulk industrial-process specifications.
Percent to mg/kg Converter
mg/kg = % × 10000
Multiply by 10,000. Same physical quantity (parts by mass), different scale — percent for bulk material grading, mg/kg for trace-contaminant work.
Percent to mg/L Converter
mg/L = % × 10000
Multiply by 10,000. The factor is exact for dilute aqueous solutions; for anything denser than water you need an explicit density correction.
Percent to Parts per Billion Converter
ppb = % × 10⁷
Convert percent to ppb by multiplying by 10⁷. The factor that takes a bulk-purity percentage into the ppb scale used for trace-impurity specification on a certificate of analysis.
Percent to PPM Converter
ppm = % × 10000
Convert percent to parts per million by multiplying by 10,000. The scale-up step between bulk composition and trace-contaminant notation.
Percent v/v to mL/L Converter
mL/L = % v/v × 10
Convert % v/v to mL/L by multiplying by 10. Needed when percent volume composition crosses into the mL/L form a bench-prep dilution calculation expect.
Percent w/v to g/100mL Converter
g/100mL = % w/v × 1
Convert % w/v to g/100 mL. The two notations describe the same quantity by definition — % w/v is grams of solute per 100 mL of solution.
Percent w/v to g/L Converter
g/L = % w/v × 10
Convert % w/v to g/L by multiplying by 10. The simple ten-fold step between the percent notation on a clinical or pharma label and the g/L units used in lab calculations.
Percent w/v to mg/mL Converter
mg/mL = % w/v × 10
Convert % w/v to mg/mL by multiplying by 10. The clean factor that takes a clinical or pharma label concentration into the mg/mL units a dose calculation actually uses.
Percent w/v to PPM Converter
ppm = % w/v × 10000
Convert % w/v to ppm by multiplying by 10,000. The factor that takes a clinical or pharma label concentration into the ppm scale environmental and water-quality reports use.
Percent w/w to PPM Converter
ppm = % w/w × 10000
Convert % w/w to ppm by multiplying by 10,000. A unit step between bulk weight-percent specifications and ppm-scale impurity reporting.
Picomolar to Micromolar Converter
µM = pM × 10⁻⁶
Convert picomolar to micromolar — the conversion you run when a tight binding constant in pM has to be compared against a micromolar working concentration. Formula, worked examples, and a values table.
Picomolar to Millimolar Converter
mM = pM × 10⁻⁹
Convert pM to mM by multiplying by 10⁻⁹. Nine prefix decades sit between ultra-high binding constants and bench-scale buffer concentrations.
Picomolar to Molar Converter
M = pM × 10⁻¹²
Convert pM to M by multiplying by 10⁻¹². Twelve prefix decades sit between trace-binding constants and bench-stock molarity.
Picomolar to Nanomolar Converter
nM = pM × 0.001
Convert picomolar to nanomolar by dividing by 1000. The step up the concentration ladder you make when comparing a tight binding constant in pM against a working dose in nM.
PPB (Air) to µg/m³ Converter
µg/m³ = (ppb × MW) ÷ 24.45
µg/m³ = (ppb × MW) / 24.45. The molecular weight has to be in there because ppb in air is a mole ratio while µg/m³ is mass per volume — and 24.45 is the ideal-gas molar volume at 25 °C and 1 atm.
PPB to mg/L Converter
mg/L = ppb ÷ 1000
Convert ppb to mg/L by dividing by 1000. For dilute aqueous solutions the equivalence is exact: 1000 ppb = 1 mg/L = 1 ppm.
PPB to ng/g Converter
ng/g = ppb × 1 (numerically identical)
Convert ppb to ng/g — numerically identical for any mass per mass ratio. The two notations describe the same trace concentration with different prefix labels.
PPB to Parts per Trillion Converter
ppt = ppb × 1000
Convert ppb to ppt by multiplying by 1000. The decimal step bridging historical ppb-scale environmental data and modern ppt-scale PFAS measurements.
PPB to PPM Converter
ppm = ppb ÷ 1000
Convert ppb to ppm by dividing by 1000. The decimal step bridging trace water-quality measurements and bulk soil-contamination data.
PPB to µg/kg Converter
µg/kg = ppb × 1 (numerically identical)
Convert ppb to µg/kg — numerically identical for any mass per mass ratio. Both notations describe the same trace concentration with different prefix labels.
PPB to µg/L Converter
µg/L = ppb × 1 (for dilute aqueous solutions)
For dilute aqueous samples, ppb and µg/L are the same number — 1 ppb of solute in water works out to 1 µg per liter. The identity only holds when the matrix density is close to 1 g/mL.
PPM (Air) to mg/m³ Converter
mg/m³ = (ppm × MW) ÷ 24.45
Convert ppm in air to mg/m³ via mg/m³ = (ppm × MW) / 24.45. Comes up at the boundary of mole-ratio exposure limits and mass-concentration analytical readings.
PPM (v/v) to µL/mL Converter
µL/mL = ppm (v/v) ÷ 1000
Convert ppm v/v to µL/mL by dividing by 1000. The decimal step bridging stack-emissions monitoring and laboratory dilution-calibration calculations.
PPM to g/kg Converter
g/kg = ppm ÷ 1000
Convert ppm to g/kg by dividing by 1000. The decimal step bridging trace analytical results and bulk supplement formulation in soil and feed work.
PPM to g/L Converter
g/L = ppm ÷ 1000
Convert ppm to g/L by dividing by 1000. For dilute aqueous solutions the equivalence is exact: 1000 ppm = 1 g/L.
PPM to mg/kg Converter
mg/kg = ppm × 1 (numerically identical)
Convert ppm to mg/kg — numerically identical for any mass per mass ratio. The two notations describe the same trace concentration with different prefix labels.
PPM to mg/L Converter
mg/L = ppm × 1 (for dilute aqueous solutions)
Convert ppm to mg/L — a 1:1 equivalence for dilute aqueous solutions. The identity that holds as long as your solvent is close to water in density.
PPM to Molarity Converter
M = (ppm ÷ 1000) ÷ MW (for aqueous solutions)
Convert ppm to molarity via M = (ppm/1000) / MW. Comes up at the boundary of regulatory mass-concentration data into the molar form geochemical speciation needs.
PPM to Parts per Trillion Converter
ppt = ppm × 10⁶
Convert ppm to ppt by multiplying by 10⁶. Six prefix decades sit between industrial-process water and semiconductor-grade ultrapure water.
PPM to Percent Converter
% = ppm ÷ 10000
Convert ppm to percent by dividing by 10,000. Used when trace concentrations must meet the percent-scale form bulk specifications expect.
PPM to Percent w/v Converter
% w/v = ppm ÷ 10000
Divide by 10,000. The factor is exact for dilute aqueous solutions — strictly speaking it relies on density being 1 g/mL, which is fine for water-quality work and breaks for anything you'd call concentrated.
PPM to Percent w/w Converter
% w/w = ppm ÷ 10000
Convert ppm to % w/w by dividing by 10,000. Used when trace-impurity ppm-scale specs must meet the bulk-purity percent-scale form total-impurity tables expect.
PPM to PPB Converter
ppb = ppm × 1000
Convert ppm to ppb by multiplying by 1000. The decimal step bridging soil-matrix contaminant concentrations and drinking-water trace measurements.
µg/kg to PPB Converter
ppb = µg/kg × 1 (numerically identical)
µg/kg and ppb are the same number for any mass-per-mass ratio. Different labels for the same trace concentration.
µg/L to Grams per Liter Converter
g/L = µg/L × 10⁻⁶
Convert µg/L to g/L by multiplying by 10⁻⁶. A jump of six prefix decades, the gap between trace drinking-water analysis and bulk-brine source-water characterization.
µg/L to mg/L Converter
mg/L = µg/L × 0.001
Convert µg/L to mg/L by dividing by 1000. The decimal step bridging trace polishing-effluent measurements and the mg/L form NPDES permits use.
µg/L to ng/mL Converter
ng/mL = µg/L × 1 (numerically identical)
Convert µg/L to ng/mL — numerically identical for any aqueous solution. The two notations describe the same trace concentration with different prefix combinations.
µg/L to PPB Converter
ppb = µg/L × 1 (for dilute aqueous solutions)
For dilute aqueous samples, µg/L and ppb are the same number — the conversion is the paper-trail step between an ICP-MS output and a public-facing compliance report.
µg/m³ to PPB (Air) Converter
ppb = (µg/m³ × 24.45) ÷ MW
ppb = (µg/m³ × 24.45) ÷ MW. The 24.45 is the ideal-gas molar volume at 25 °C and 1 atm; the molar mass is in there because µg/m³ is mass per volume while ppb in air is a mole ratio.
µg/mL to mg/L Converter
mg/L = µg/mL × 1 (numerically identical)
Convert µg/mL to mg/L — numerically identical for any aqueous solution. Both notations describe the same concentration with different prefix combinations.
µL/mL to PPM (v/v) Converter
ppm (v/v) = µL/mL × 1000
Convert µL/mL to ppm v/v by multiplying by 1000. The decimal step bridging gas-dilution calibration math and stack-monitor instrument output.