Fluid Dram to Millilitre Converter

Convert fluid drams to millilitres with precision for both Imperial and US measurements

Enter Fluid Drams:

Select System:

Decimal Places:

Quick Conversion Tables

Imperial Fluid Drams to Millilitres

Fluid Drams (Imperial)	Millilitres (mL)	Approximate
1 fl dr	3.5516 mL	Just under 1 teaspoon
2 fl dr	7.1033 mL	About 1.5 teaspoons
4 fl dr	14.2065 mL	About 1 tablespoon
8 fl dr	28.4131 mL	1 fluid ounce (Imperial)
16 fl dr	56.8261 mL	2 fluid ounces
32 fl dr	113.6523 mL	4 fluid ounces
64 fl dr	227.3045 mL	8 fluid ounces
128 fl dr	454.6090 mL	1 pint (Imperial)

US Fluid Drams to Millilitres

Fluid Drams (US)	Millilitres (mL)	Approximate
1 fl dr	3.6967 mL	About 3/4 teaspoon
2 fl dr	7.3934 mL	About 1.5 teaspoons
4 fl dr	14.7868 mL	About 1 tablespoon
8 fl dr	29.5735 mL	1 fluid ounce (US)
16 fl dr	59.1471 mL	2 fluid ounces
32 fl dr	118.2941 mL	4 fluid ounces
64 fl dr	236.5882 mL	8 fluid ounces (1 cup)
128 fl dr	473.1765 mL	1 pint (US)

Conversion Formulae

Imperial: mL = fluid drams × 3.5516328125

One Imperial fluid dram equals exactly 3.5516328125 millilitres. This is based on the Imperial fluid ounce containing 28.4130625 mL divided by 8 drams per ounce.

US: mL = fluid drams × 3.6966911953125

One US fluid dram equals exactly 3.6966911953125 millilitres. This is derived from the US fluid ounce containing 29.5735295625 mL divided by 8 drams per ounce.

How to Convert Manually

Identify which system you’re working with (Imperial or US customary)
Multiply your fluid dram value by the appropriate conversion factor (3.5516 for Imperial, 3.6967 for US)
Round the result to your desired decimal places
Verify the answer makes sense in context (e.g., 8 drams should equal approximately 1 fluid ounce)

Imperial vs US Fluid Drams

Key Difference: The Imperial and US fluid dram differ by approximately 0.145 mL per dram, which represents about a 4% variance. This difference stems from the larger Imperial fluid ounce compared to the US fluid ounce.

Characteristic	Imperial Fluid Dram	US Fluid Dram
Millilitre equivalent	3.5516 mL	3.6967 mL
Drams per fluid ounce	8 fl dr	8 fl dr
Primary region	United Kingdom, former British territories	United States
Historical use	Pharmacy, medicine dispensing	Pharmacy, apothecary measurements
Current status	Largely replaced by metric (mL)	Occasionally used in traditional contexts

History of the Fluid Dram

The fluid dram originated from the apothecaries’ system of measurement, which was historically employed by pharmacists and physicians for preparing medications. The term “dram” derives from the Ancient Greek word “drachma,” which referred to both a coin and a unit of weight.

Apothecaries’ System: The traditional apothecaries’ system divided measurements into grains, scruples, drams, ounces, and pounds. One fluid dram represented exactly one-eighth of a fluid ounce, making it a practical subdivision for measuring liquid medicines.

In the British Imperial system, which was standardised in 1824, the fluid dram became defined as 1/8 of an Imperial fluid ounce. Meanwhile, the United States maintained its own customary system with slightly different volume definitions, resulting in the US fluid dram being approximately 4% larger than its Imperial counterpart.

Throughout the 19th and early 20th centuries, fluid drams were commonly marked on medicine bottles and measuring devices. Pharmacists would precisely measure doses in drams for prescriptions. However, with the widespread adoption of the metric system in the latter half of the 20th century, millilitres have largely replaced fluid drams in medical and pharmaceutical contexts across both the UK and US.

Common Applications

Pharmaceutical Measurements

Historically, fluid drams were the standard unit for liquid medication dosing. Vintage medicine bottles often featured markings in drams alongside ounces. Modern pharmaceutical practice has transitioned to millilitres for greater precision and international standardisation.

Historical Recipe Conversions

Antique cookery books and traditional recipes, particularly those from the Victorian era, may specify ingredients in fluid drams. Converting these measurements to millilitres allows contemporary cooks to accurately recreate historical dishes.

Essential Oil and Perfumery

Some traditional perfumers and aromatherapy practitioners reference fluid drams when discussing concentrate formulations. A single fluid dram represents approximately 60-70 drops of liquid, depending on viscosity.

Veterinary Medicine

Older veterinary texts and some traditional animal care practices may reference fluid drams for dosing medications. Modern veterinary practice predominantly employs millilitres for consistency with human medicine standards.

Frequently Asked Questions

What is the difference between Imperial and US fluid drams?

Imperial fluid drams (UK) equal 3.5516 mL, whilst US fluid drams equal 3.6967 mL. The difference arises because Imperial and US fluid ounces have different volumes, even though both systems define 8 drams as 1 fluid ounce. The US dram is approximately 4% larger than the Imperial dram.

How many millilitres are in one fluid dram?

One Imperial fluid dram contains 3.5516 millilitres, whilst one US fluid dram contains 3.6967 millilitres. For most practical purposes, you can approximate both as roughly 3.5 to 3.7 mL, though precision matters in pharmaceutical applications.

Is the fluid dram still in use today?

Fluid drams are rarely used in modern practice. The metric system (millilitres) has replaced drams in virtually all medical, pharmaceutical, and culinary contexts across the UK and most Commonwealth countries. You may encounter drams in historical recipes, antique measuring equipment, or traditional apothecary references.

How many fluid drams equal one tablespoon?

A standard tablespoon holds approximately 15 mL, which equals about 4.2 Imperial fluid drams or 4.1 US fluid drams. However, tablespoon volumes can vary slightly by country, so this conversion is approximate rather than exact.

What is the symbol for fluid dram?

The fluid dram is commonly abbreviated as “fl dr” or “fl dram.” In older apothecaries’ notation, it was sometimes represented by the symbol “ƒʒ” (a stylised form of the letter ‘f’ combined with ‘3’). The symbol “dr” alone typically refers to the dram as a unit of mass, not volume.

Can I use fluid drams for cooking measurements?

Whilst you can use fluid drams for cooking, millilitres or standard cooking measurements (teaspoons, tablespoons, cups) are far more practical for modern recipes. If you’re following a historical recipe specifying drams, convert to millilitres: multiply Imperial drams by 3.55 or US drams by 3.70.

How do fluid drams relate to fluid ounces?

In both Imperial and US systems, 8 fluid drams equal 1 fluid ounce. This relationship remains constant across systems, though the actual millilitre volumes differ. One Imperial fluid ounce equals 28.41 mL (8 × 3.55 mL), whilst one US fluid ounce equals 29.57 mL (8 × 3.70 mL).