Percent w/v to g/100mL Converter

% w/v

g/100mL

Common Conversions

% w/v	g/100mL
0.1	0.1
0.5	0.5
0.9	0.9
1	1
2	2
5	5
10	10
20	20
37	37
50	50
70	70
100	100

Why this conversion matters in chemistry

Percent w/v is the apothecary-era shorthand for grams of solute per 100 mL of solution. The two notations are numerically identical: 0.9% w/v is exactly 0.9 g per 100 mL, the standard normal-saline preparation. The conversion is the identity, but it sits at a useful junction in clinical and pharma documentation where label strengths in % w/v have to meet bulk-reagent assays in g/100 mL. The multiplier of 1 means no rounding, which is part of why both notations have survived in clinical-chemistry contexts.

Formula

g/100mL = % w/v × 1

Worked Examples

1% w/v = 1 g/100mL

The defining identity — one percent w/v is exactly one gram per 100 mL of solution.

0.9% w/v = 0.9 g/100mL

Normal saline — the isotonic NaCl preparation, used as both a clinical IV fluid and a biochemistry buffer base.

5% w/v = 5 g/100mL

Five-percent dextrose in water — one of the most common IV maintenance fluids.

10% w/v = 10 g/100mL

A 10% w/v reagent stock — common for SDS in protein-chemistry buffers.

Frequently Asked Questions

Is this always 1:1?

Yes. Percent w/v is defined as grams per 100 mL — the two notations are the same quantity, just written differently. The conversion factor is exactly 1, with no rounding.

What is concentrated HCl in % w/v?

Commercial concentrated HCl is typically 37% by weight (w/w) at a density of about 1.19 g/mL, which works out to roughly 44 g HCl per 100 mL — about 44% w/v. The w/w and w/v distinction matters for any concentrated reagent.

How do I prepare a % w/v solution?

Dissolve the required grams of solute in some solvent, then bring up to the final 100 mL volume in a volumetric flask. For 5% w/v: 5 g of solute dissolved and diluted to a 100 mL final volume.