Short answer: among the six UK alcohol-free beers whose current nutrition we verified for this comparison, Days Lager has the lowest declared energy at 10 kcal per 100ml, or 33 kcal for a 330ml can. If your only criterion is the smallest calorie number, that is the lowest in this verified set.
That is not the whole decision. Can size, alcohol level, beer style and what you want to replace all matter. A 330ml can and a 440ml can should not be compared using the can total alone, so this guide shows both calories per 100ml and calculated calories per serving.
Disclosure: IMPOSSIBREW publishes this page and sells two of the beers listed. We apply the same comparison basis to every product and link to the current product source for each row.
Lowest-calorie alcohol-free beers compared
These figures were checked against current UK product or manufacturer sources between 13 and 18 August 2026. Calories per serving are calculated from the declared per-100ml figure and the stated can size. Formulas and labels change, so check the linked product page if you need the latest value for a strict diet.
| Beer | kcal per 100ml | Can size | kcal per can |
|---|---|---|---|
| Days Lager | 10 | 330ml | 33 |
| Lucky Saint Superior Unfiltered Lager | 16 | 330ml | 52.8 |
| IMPOSSIBREW Enhanced Hazy Pale | 16 | 440ml | 70.4 |
| IMPOSSIBREW Enhanced Lager | 17 | 440ml | 74.8 |
| Guinness 0.0 | 17 | 440ml | 74.8 |
| Heineken 0.0 | 21 | 330ml | 69.3 |
Calculation: declared kcal per 100ml × can volume ÷ 100. The table does not claim to cover every alcohol-free beer sold in the UK. It covers the products for which we currently hold a complete, verified comparison record.
Which alcohol-free beer is lowest in calories?
Days Lager is the lowest in this verified six-product set at 10 kcal per 100ml. A 330ml can calculates to 33 kcal. Lucky Saint and IMPOSSIBREW Enhanced Hazy Pale are next at 16 kcal per 100ml, although their serving totals differ because one can is 330ml and the other is 440ml.
That distinction matters. If you are comparing labels in a shop, use kcal per 100ml to compare the drinks fairly. Then use kcal per can to understand what you will actually consume.
Best low-calorie alcohol-free beer by what you want
For the smallest verified calorie number
Choose Days Lager from this set. It is 10 kcal per 100ml and 0.0% ABV. It is the clearest answer when calorie minimisation is the deciding factor.
For a 330ml unfiltered lager
Lucky Saint is 16 kcal per 100ml and calculates to 52.8 kcal per 330ml can. It is a useful middle ground if you want a familiar lager format with fewer calories per can than the larger 440ml options.
For a larger 440ml pale beer
IMPOSSIBREW Enhanced Hazy Pale is also 16 kcal per 100ml. Its larger 440ml can calculates to 70.4 kcal. Compare it on the per-100ml basis rather than assuming the higher can total means the liquid itself is more calorific.
For a full-size lager and evening unwind ritual
IMPOSSIBREW Enhanced Lager is 17 kcal per 100ml, or 74.8 kcal for a 440ml can. It is not the lowest-calorie beer in the table. It is our recommendation when you want a full-size lager designed as an evening alcohol alternative rather than the smallest possible serving.
It contains IMPOSSIBREW's Social Blend, and its current product nutrition and ingredients are available on the Enhanced Lager product page. If you want the wider category view first, see our guide to the best non-alcoholic lagers in the UK.
For a 0.0% stout
Guinness 0.0 is 17 kcal per 100ml and calculates to 74.8 kcal per 440ml can. It is the stout option in this comparison, so its role is different from the lagers and pale beer even where the calorie figure matches.
For a mainstream 330ml 0.0 lager
Heineken 0.0 is 21 kcal per 100ml and calculates to 69.3 kcal for 330ml. Its smaller can means its serving total is below both 440ml products listed at 17 kcal per 100ml, which is another reason to check both columns.
Are alcohol-free beers lower in calories than alcoholic beer?
Often, yes. Alcohol contributes energy, so removing most or all of it can materially reduce calories. But alcohol-free does not automatically mean calorie-free, sugar-free or suitable for every dietary need. Recipes and serving sizes vary. Use the product's current nutrition panel rather than assuming every 0.0% or 0.5% beer is nutritionally identical.
How to compare low-calorie beer labels properly
- Start with kcal per 100ml. This is the fairest comparison across different can and bottle sizes.
- Calculate the serving total. Multiply kcal per 100ml by the serving volume, then divide by 100.
- Check the ABV you need. In the UK, products described as alcohol-free can still differ in trace alcohol. Choose a verified 0.0% product if that distinction matters to you.
- Check the current source. Formulas, pack sizes and labels can change.
- Choose for the job. Lowest calories, a strict 0.0% requirement, beer style and serving size are separate decisions.
Our verdict
Days Lager is the lowest-calorie option in this verified comparison. Lucky Saint and IMPOSSIBREW Enhanced Hazy Pale are joint next-lowest per 100ml. IMPOSSIBREW Enhanced Lager is not the smallest calorie number, but it is our pick for a larger lager built around the evening unwind occasion.
For more category choices, read our independently structured guide to the best alcohol-free beer in the UK.
See IMPOSSIBREW Enhanced Lager nutrition and current availability
Frequently asked questions
What is the lowest-calorie alcohol-free beer in the UK?
Among the six products currently verified in this comparison, Days Lager is lowest at 10 kcal per 100ml, or 33 kcal for a 330ml can. This is a bounded comparison, not a claim about every product sold in the UK.
Is IMPOSSIBREW the lowest-calorie alcohol-free beer?
No. Enhanced Hazy Pale is 16 kcal per 100ml and Enhanced Lager is 17 kcal per 100ml. Lower-calorie products exist, including Days Lager at 10 kcal per 100ml in this verified set.
Should I compare calories per 100ml or per can?
Use calories per 100ml to compare products fairly, then calories per can to understand your actual serving. A lower per-100ml beer can still have a higher serving total if the can is larger.
Does 0.0% mean zero calories?
No. A 0.0% beer can still contain calories from carbohydrates and other ingredients. Check the current nutrition panel.
When were these figures checked?
The six comparison records were verified between 13 and 18 August 2026 using current product or manufacturer sources. The page was repaired on 19 August 2026 after an earlier shortened version removed too much useful comparison information.
