What this converter does

Convert between US fluid ounces, UK (Imperial) fluid ounces, milliliters (mL), centiliters (cL) and liters (L). Use it for recipes, lab notes, beverage volumes, or packaging the tool returns high-precision values and trims unnecessary trailing zeros for readable results.

Key reference values used by most authoritative converters: 1 US fl oz ≈ 29.57353 mL; 1 UK fl oz ≈ 28.41306 mL.

How to use the converter

1. Enter the numeric value you want to convert in From (the field accepts decimals).
2. Pick the unit in the From dropdown (US fl oz / UK fl oz / mL / cL / L).
3. Choose the target unit in the To dropdown.
4. Click Convert the result appears in the result box and in the read-only To field.
5. Use Swap to reverse units and auto-convert.

How it works

• To convert fluid ounces → milliliters (US):
  mL = oz × 29.5735295625 (use this when “From” is US fl oz).
• To convert fluid ounces → milliliters (UK/Imperial):
  mL = oz × 28.4130625.
• To convert milliliters → fluid ounces:
  US fl oz = mL ÷ 29.5735295625
UK fl oz = mL ÷ 28.4130625.
• Between metric volumes:
  cL = mL ÷ 10, L = mL ÷ 1000 (and reversed by multiplying).

Our code implements these steps by converting any input to milliliters (using the unit’s toMl multiplier) then dividing by the target unit’s toMl a robust approach for multi-unit conversion.

Examples

• 8 US fl oz → mL: 8 × 29.5735295625 = 236.5882365 → shown as 236.5882365 mL.
• 16 US fl oz (1 US pint) → mL: ≈ 473.176472 mL.
• 16 UK fl oz → mL: 16 × 28.4130625 = 454.609 ≈ 454.609 mL (imperial pint comparison).

Precision, rounding & nutrition

• The converter provides high-precision output and strips unnecessary trailing zeros for readability (e.g., 2.5000000000 becomes 2.5). This is what your code’s .toFixed(10).replace(/\.?0+$/, '') logic accomplishes.
• Nutrition & packaging: some regulatory or nutrition-label contexts round 1 fl oz to 30 mL for simplicity; that’s a labeling convention, not the exact physical conversion (exact value ≈ 29.5735 mL). Use the exact factor for scientific or recipe accuracy, and the rounded value only where allowed/necessary.

Mass ounces vs fluid ounces

• Your converter handles fluid ounces (volume). If a user inputs a mass ounce (oz as weight), you must convert mass → volume using density. For most ingredients this varies (oil, honey, flour differ). The conversion formula for mass ounces → milliliters is:

milliliters = (ounces_mass × 28.349523125 grams_per_ounce) ÷ density_g_per_mL

So for water (density ≈ 1 g/mL): 1 oz (mass) ≈ 28.35 mL. Compare that with 1 US fluid oz ≈ 29.57 mL they are similar but not identical.

Need to convert grams to milliliters for recipes, food science, or cosmetics?
Try our dedicated tool: Grams to mL Converter.

Quick US Ounce-to-Milliliter Chart

Ounces	mL (Exact)	Rounded
1.7 oz	1.7 × 29.57353 = 50.2750 mL	~50 mL
2 oz	59.1471 mL	~59 mL
2.5 oz	73.9338 mL	~74 mL
3 oz	88.7206 mL	~89 mL
3.4 oz	100.5500 mL	~100 mL
4 oz	118.2941 mL	~118 mL
5 oz	147.8676 mL	~148 mL
6 oz	177.4412 mL	~177 mL
8 oz	236.5882 mL	~237 mL
10 oz	295.7353 mL	~296 mL
12 oz	354.8824 mL	~355 mL
16 oz	473.1765 mL	~473 mL
20 oz	591.4706 mL	~591 mL
24 oz	709.7647 mL	~710 mL
32 oz	946.3529 mL	~946 mL
40 oz	1182.9412 mL	~1183 mL

FAQ

Q1. Which ounce does this use US or UK?

A: You can choose either. This tool supports both US fluid ounces (1 US fl oz = 29.5735295625 mL) and UK (imperial) fluid ounces (1 UK fl oz = 28.4130625 mL).

Q2. Why does a nutrition label say 30 mL per ounce?

A: Labels often round to simplify; the exact conversion is ~29.5735 mL for US fl oz. For precise work, use the exact factor.

Q3. Why do US and UK fluid ounces convert differently?

The United States and United Kingdom define a fluid ounce based on different base volumes. A US fl oz is slightly larger than a UK/Imperial fl oz, so the milliliter value changes depending on the system selected.

Q4. Can I use this for recipes?

A: Absolutely. This converter works perfectly for baking, cocktails, smoothies, baby formula, and general cooking.
Just remember if a recipe lists ounces by weight, convert using ingredient density, not fluid ounces.

Sources

ConvertUnits, OmniCalculator, TheCalculatorSite, InchCalculator and unit-conversion resources.