Unit & Concentration Converter

Percent and ratio strengths, mass, and needle gauge.

Percent solution

Preset

Presets fill the percentage only — read the strength off the ampoule.

Concentration % w/v

Volume ml

Concentration —mg/ml

Enter a percentage.

Total in that volume —mg

Enter a percentage and a volume.

USP General Notices 8.140 — USP General Notices (PDF). Cross-check: e-Safe Anaesthesia (WFSA), Concentration as %.

Ratio strength

Ratio

Concentration —mg/ml

In micrograms —µg/ml

Select a ratio.

Per ml contains —

Adrenaline strengths in practice

1:10001 mg in 1 ml ampoule — IM in anaphylaxis 1 mg/ml

1:10,0001 mg in 10 ml prefilled syringe — IV in cardiac arrest 100 µg/ml

1:100,000local anaesthetic additive 10 µg/ml

1:200,000commonest strength in local anaesthetic solutions 5 µg/ml

1:1000 and 1:10,000 differ ten-fold — 1 mg/ml against 0.1 mg/ml

Definition: Univ. of Washington PHARM 309, Expressions of drug amounts (PDF) · 1:200,000 = 5 µg/ml: Xylocaine-MPF PI, DailyMed

Single-entity adrenaline is labelled 1 mg/ml and 0.1 mg/ml since 2016: USP, Elimination of ratio expression · Anaphylaxis: Resuscitation Council UK

Mass

Micrograms µg

Milligrams mg

Grams g

1 g = 1000 mg = 1,000,000 µg — type into any field

BIPM, SI Brochure, 9th edition. Write microgram in full when prescribing — ISMP error-prone abbreviations (PDF).

Needle & catheter gauge

French = mm outer diameter × 3 · 18 G = 1.27 mm × 3 = 3.8 Fr · 3 Fr = 1.00 mm

Gauge counts down as the needle thickens; French counts up — 1 Fr = ⅓ mm.

Outer diameters: Harvard Apparatus, French Scale and Needle Gauge Cross Reference (PDF), Birmingham (Stubs) wire gauge.

Outer diameter is fixed by gauge; bore and flow are not — wall classes, ISO 9626:2016. Hub colour, ISO 6009:2016, does not carry over to IV cannulae. Read the printed gauge.