g/L
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Equivalent concentration
Accurate conversion between percent concentration (% w/v) and grams per litre
Convert salt concentration from % (w/v) to g/L instantly with precise calculations. Includes reverse g/L to % conversion, mg/L, ppm, mg/dL, molarity (NaCl), full formula reference, and concentration tables for 2026.
Professional concentration conversion for chemistry, medicine, food science, and laboratory work
Convert percent weight-per-volume concentration (% w/v) to grams per litre using the exact formula: g/L = % × 10. A 1% (w/v) solution contains 1 gram of solute per 100 mL, which equals exactly 10 g/L. Our tool also outputs mg/L, ppm, mg/dL, and molarity for NaCl, giving you a complete multi-unit concentration breakdown in one step.
Switch seamlessly between % (w/v) to g/L and g/L to % (w/v) conversion modes. Whether you are preparing a saline solution from a percentage specification, interpreting a lab result in g/L, or verifying a pharmaceutical formulation, both conversion directions are handled instantly from a single input value.
Essential for chemistry laboratories, medical and clinical settings, food science, aquariums, swimming pool chemistry, and saltwater systems. Correct concentration conversion is critical for preparing buffer solutions, IV saline bags, cell culture media, electroplating baths, and any application where precise salinity or solute concentration must be maintained in 2026.
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Percent concentration (% w/v) expresses the mass of solute in grams dissolved in 100 millilitres of solution. It is one of the most common ways to describe salt concentrations in chemistry, clinical medicine, and food science. For example, normal physiological saline is 0.9% (w/v), meaning 0.9 grams of sodium chloride per 100 mL of solution. Grams per litre (g/L) expresses the same relationship but per 1,000 mL instead of 100 mL, making the conversion straightforward: since 1 litre is 10 times 100 mL, simply multiply the percentage by 10 to get g/L.
The conversion is essential because different disciplines use different concentration units. Clinical laboratories report blood chemistry in mg/dL, water quality standards use mg/L (ppm), chemistry protocols specify mol/L (molarity), and food labelling often uses g/L. Understanding how all these units relate to the simple percentage value helps scientists, clinicians, aquarists, and food technologists work accurately across disciplines. You can review official concentration definitions from the NIST Weights and Measures reference.
0.9% (w/v) normal saline = 9 g/L = 9,000 mg/L = 0.154 mol/L — the same concentration expressed in four different unit systems used across medicine, chemistry, and water quality.
The table below provides quick reference values covering the most common salt concentrations in biology, medicine, food science, and aquatics in 2026. For pressure unit conversions relevant to laboratory and industrial contexts, see our Atmospheres to Pascals Converter.
| % (w/v) | g/L | mg/L (ppm) | mg/dL | NaCl mol/L (M) | Application |
|---|---|---|---|---|---|
| 0.09% | 0.9 g/L | 900 mg/L | 90 mg/dL | 0.0154 M | Hypotonic saline |
| 0.9% | 9 g/L | 9,000 mg/L | 900 mg/dL | 0.154 M | Normal saline (physiological) |
| 1.0% | 10 g/L | 10,000 mg/L | 1,000 mg/dL | 0.171 M | Hypertonic saline |
| 1.8% | 18 g/L | 18,000 mg/L | 1,800 mg/dL | 0.308 M | Hypertonic IV solution |
| 2.0% | 20 g/L | 20,000 mg/L | 2,000 mg/dL | 0.342 M | Industrial brine (light) |
| 3.5% | 35 g/L | 35,000 mg/L | 3,500 mg/dL | 0.599 M | Average seawater salinity |
| 5.0% | 50 g/L | 50,000 mg/L | 5,000 mg/dL | 0.856 M | Food preservation brine |
| 6.0% | 60 g/L | 60,000 mg/L | 6,000 mg/dL | 1.027 M | Fermentation / pickling |
| 8.0% | 80 g/L | 80,000 mg/L | 8,000 mg/dL | 1.369 M | Heavy brine solution |
| 10.0% | 100 g/L | 100,000 mg/L | 10,000 mg/dL | 1.711 M | Near-saturated solution |
| 20.0% | 200 g/L | 200,000 mg/L | 20,000 mg/dL | 3.422 M | Saturated NaCl solution |
| 26.4% | 264 g/L | 264,000 mg/L | 26,400 mg/dL | 4.517 M | NaCl saturation point (20°C) |
Use this reverse reference table when reading concentration values in g/L from laboratory instruments, water quality reports, or food specifications and needing to express them as a percentage for formulation or comparison purposes.
| g/L | % (w/v) | mg/L (ppm) | NaCl mol/L (M) | Common Context |
|---|---|---|---|---|
| 1 g/L | 0.1% | 1,000 ppm | 0.0171 M | Trace mineral water |
| 5 g/L | 0.5% | 5,000 ppm | 0.0856 M | Electrolyte solution |
| 9 g/L | 0.9% | 9,000 ppm | 0.154 M | Normal saline (0.9% NaCl) |
| 10 g/L | 1.0% | 10,000 ppm | 0.171 M | Isotonic-plus solution |
| 15 g/L | 1.5% | 15,000 ppm | 0.257 M | Contact lens solution |
| 20 g/L | 2.0% | 20,000 ppm | 0.342 M | Light brine / gargling |
| 35 g/L | 3.5% | 35,000 ppm | 0.599 M | Average ocean salinity |
| 50 g/L | 5.0% | 50,000 ppm | 0.856 M | Food brining / fermentation |
| 100 g/L | 10.0% | 100,000 ppm | 1.711 M | Near-saturated salt bath |
| 200 g/L | 20.0% | 200,000 ppm | 3.422 M | Saturated NaCl solution |
Converting between % w/v and g/L is a daily requirement across medicine, food science, water management, and research laboratories. Here are the most common use cases.
Hospital saline solutions are universally formulated as 0.9% (w/v) NaCl — equivalent to 9 g/L — matching the physiological osmolarity of human blood plasma. Hypertonic saline at 3% (30 g/L) is used in neurological emergencies. Nurses and pharmacists must convert between % and g/L when preparing or verifying IV drip formulations to ensure patient safety.
Cell culture media, phosphate-buffered saline (PBS), and buffer solutions are prepared using precise salt concentrations. PBS typically contains NaCl at 8 g/L (0.8%), KCl at 0.2 g/L (0.02%), and phosphate salts. Researchers express stock solution concentrations as g/L for weighing accuracy and convert to % or molarity depending on the protocol being followed.
Marine aquariums require salinity of approximately 3.3–3.5% (33–35 g/L) to match natural seawater. Aquarists use refractometers that measure specific gravity or ppt (parts per thousand, numerically equal to g/L for water-based solutions), then convert to % for salt mix preparation. Precise conversion prevents osmotic stress and mortality in sensitive marine species.
Food technologists prepare brining solutions for meat, fish, cheese, and vegetables using percentage-based recipes, but production-scale batches are measured in g/L for large vessel fills. A 5% brine (50 g/L) is standard for vegetable lacto-fermentation; a 10% brine (100 g/L) is used for longer-term preservation. Accurate % to g/L conversion ensures batch consistency across production runs.
Pharmaceutical preparations express active ingredient concentrations in multiple units simultaneously: w/v%, g/L, mg/mL, and mmol/L all appear in drug monographs. Oral rehydration salts (ORS) contain sodium chloride at 2.6 g/L (0.26%) alongside other electrolytes. Converting between units is mandatory for compounding pharmacists and regulatory submissions in 2026.
Saltwater pool systems maintain chloride concentrations of 2,700–3,400 mg/L (2.7–3.4 g/L, or 0.27–0.34%). Water treatment engineers specify disinfection chemical doses in g/L or mg/L and convert to % for stock solution preparation. Desalination plants measure feed water salinity in g/L and express product water purity as % or ppm to meet WHO drinking water standards.
This converter uses % w/v (weight per volume) — grams of solute per 100 mL of solution — which is the standard in chemistry, medicine, and food science for aqueous salt solutions. % w/w (weight per weight) expresses grams per 100 grams of solution and differs slightly once solution density exceeds 1 g/mL. For dilute salt solutions (under 5%), % w/v and % w/w are nearly identical. At higher concentrations, density correction becomes significant. Always confirm which percentage type your specification uses before converting.
Converting % (w/v) to g/L is a simple one-step multiplication. Here is the full process, including all derived units.
The most frequent error is confusing mg/L with g/L — they differ by a factor of 1,000. A solution at 9 g/L is not the same as 9 mg/L (which would be an extremely dilute trace amount). Similarly, do not confuse % w/v with % w/w for dense solutions — for concentrated brines above 10%, density correction may be required for accurate results. Always check whether your source protocol uses w/v or w/w notation, and confirm the solute's molar mass before calculating molarity to avoid preparation errors.
Percent weight-per-volume (% w/v) is defined as the number of grams of solute dissolved in 100 mL of solution. It is the dominant expression for salt concentrations in pharmacopoeia, clinical guidelines, and food standards worldwide. The simple × 10 relationship to g/L makes it one of the most convenient concentration units for practical laboratory work.
NIST Reference →The World Health Organisation oral rehydration solution (ORS) contains precise salt concentrations: NaCl at 2.6 g/L (0.26%), sodium citrate at 2.9 g/L, KCl at 1.5 g/L, and glucose at 13.5 g/L. These specifications are expressed in g/L for manufacturing accuracy, then converted to % for labelling. Understanding this conversion is essential in global health and emergency medicine.
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