How Many Units in a Pint: Beer, Lager, Guinness | NHS Guide

If you’ve ever found yourself in a pub ordering a pint and then trying to work out how it fits into your weekly alcohol allowance, you’re definitely not alone. UK health guidelines recommend no more than 14 units per week, but knowing how many units are actually in that pint requires understanding a simple formula based on the volume and alcohol strength. A standard UK pint contains 568ml, so the exact unit count depends entirely on the beer’s ABV—stronger varieties contain significantly more. This guide breaks down the official NHS and Ireland health authority calculations so you can track your drinking with confidence.

UK pint volume: 568ml · Strong lager pint units: 3 · Lower-strength lager pint units: 2.1 · Ireland standard drink: 4.5% ABV beer · Weekly low-risk units (men): 14

Six key figures define the UK and Ireland alcohol unit landscape: the pint volume, the weekly limit, and how strength translates to units.

How many units are on a pint?

The formula is simple: multiply the ABV percentage by the volume in millilitres, then divide by 1,000. That’s how you get your units. A standard UK pint contains 568ml, and using the formula (ABV% × 568) ÷ 1,000 gives you the unit count.

A 4% pint of beer contains 2.3 units (4 × 568 ÷ 1,000 = 2.3). According to GOV.UK’s oral health toolkit, a pint of regular 4% beer equals 2 units, while a pint of strong or premium beer equals 3 units. The same source confirms that a half pint of standard beer equals 1 unit.

Calculating alcohol units

• The formula: ABV% × Volume (ml) ÷ 1,000 = units
• Working example: 4% × 568ml ÷ 1,000 = 2.3 units
• Strong beer example: 5.2% × 568ml ÷ 1,000 = 3 units

UK pint standard

The UK uses a 568ml pint as its standard measure—this is larger than the US pint (473ml). The definition of one unit is 10ml of pure alcohol, which is approximately 8g by weight. Both Drinkaware and the Priory Group confirm this standard, which aligns with UK Chief Medical Officers’ guidance.

What this means: the difference between a 4% pint and a 5.2% pint is 0.7 units—seemingly small, but it adds up across a night’s drinking. If you drink three strong pints instead of three standard pints, you’re consuming an extra 2.1 units.

How many units in a pint of beer?

The answer depends entirely on the beer’s alcohol by volume (ABV). Typical UK beers range from 4% to over 5%, which directly affects the unit count. A 4% pint gives you 2.3 units, while a 5% pint delivers 2.8 units.

Average beer ABV examples

• Bass or similar traditional ales: 4.4% ABV = 2.5 units
• Heineken lager: 5% ABV = 2.8 units
• Guinness stout: 4% ABV = 2.3 units
• Carling or similar value lagers: 4% ABV = 2.3 units

Heineken pint units

According to Drinkaware’s beer guide, a pint of 5% ale contains 2.8 units of alcohol. The calculation is straightforward: 5 × 568 ÷ 1,000 = 2.84, which rounds to 2.8 units. This makes a single pint of Heineken already consume about a fifth of your recommended weekly allowance.

The implication: beer marketed as “premium” or “stronger” isn’t just priced higher—it’s measurably more alcohol. The 0.5% difference between 4% and 5% ABV translates to an extra half-unit per pint.

How many units in a pint of lager?

Lager strength varies significantly across the UK market. The difference between a lower-strength lager and a strong one means you’re getting substantially different alcohol exposure for the same pour size.

Strong vs lower strength

• Strong lagers (5–6% ABV): approximately 3 units per pint
• Lower-strength lagers (3.8–4% ABV): approximately 2.1–2.3 units per pint
• The difference is nearly one full unit per pint

Popular lager units

A pint of 5.2% ABV strong lager or cider contains 3 units, according to Manchester Foundation Trust’s NHS alcohol advice. Lower-strength options deliver fewer units—a 500ml can of 3.8% lager contains 1.9 units, which means two cans equals 3.8 units. GOV.UK confirms that a 440ml can of regular lager or cider contains 2 units.

The catch: lagers marketed as “premium” or sold in larger cans often contain significantly more units than consumers realise. Checking the ABV label before drinking gives you accurate numbers.

How many units is a pint in Ireland?

Ireland uses “standard drinks” rather than “units,” but the underlying definition is identical: 10g of pure alcohol per standard drink. This matches the UK definition almost exactly. The difference is purely in terminology and how drinks are classified.

Irish standard drink

According to HSE Ireland’s weekly guidelines, a pint of beer, stout, or cider at 4.5% ABV equals 2 standard drinks. A half pint at the same strength equals 1 standard drink. This differs from the UK calculation because Ireland applies a rounded classification to pints rather than a precise formula.

The UK would calculate a 4.5% pint as 2.6 units (4.5 × 568 ÷ 1,000 = 2.556), which rounds to approximately 2.6. Ireland classifies this same pint as 2 standard drinks. The numerical difference is minor, but the rounding approach means Irish guidelines are slightly more conservative.

HSE guidelines

Ireland’s Health Service Executive aligns its low-risk weekly guidelines with international evidence, recommending that adults spread any drinking across multiple days rather than saving units for single sessions. Pub spirits in Ireland are typically served in 35.5ml measures as a standard single measure, which is larger than the UK 25ml standard pour.

What this means: if you’re drinking in Ireland, the pint classification system is slightly more generous (2 standard drinks for 4.5%) compared to the UK formula (2.6 units). However, the larger spirit measures mean cocktails and spirits consumption may exceed what UK drinkers experience.

How many units of alcohol per week?

The UK’s Chief Medical Officers recommend a maximum of 14 units per week for both men and women. This limit should be spread across at least 3 days, with several drink-free days throughout the week. Saving all 14 units for a single weekend constitutes binge drinking and carries significant health risks.

Low-risk guidelines

According to Drinkaware’s guidance (reflecting official UK CMO guidelines), 14 units per week is equivalent to 6 pints of 4% ABV beer or 6 medium (175ml) glasses of 13% ABV wine. The recommendation explicitly states that there’s no completely safe level of drinking, but sticking within these guidelines lowers your risk of harming your health.

Binge drinking thresholds are clearly defined: more than 6 units in a single session for women and 8 units for men. Drinkaware confirms that drinking heavily on individual days—even if your weekly total stays under 14—can still push you into risky territory.

NHS weekly limits

The NHS provides straightforward guidance: regularly drinking more than 14 units per week increases your risk of heart disease, liver disease, and seven types of cancer. Drinkaware’s alcohol fact sheet emphasises that risk of developing cancer starts to increase even at low levels of drinking.

The implication: weekly limits exist to prevent cumulative damage, not to set a “safe” target. Each additional unit above 14 incrementally raises health risk, and there’s no threshold below which risk disappears entirely.