Hosts planning individual servings
If adults will take their own cans, compare caffeine per can as well as volume. Red Bull UK states 80 mg in its 250 ml Original can; Tesco lists 160 mg in a 500 ml Monster Ultra can.
Who is choosing the drinks?
Hosts offering a sugar-free choice
A zero-sugar can gives guests a different sugar option, but it may still contain caffeine and sweeteners. Check the exact flavour and pack rather than relying on the words “sugar-free” alone.
Organisers serving a larger group
Multipacks provide individual cans to hand out. Count the servings you need, then check whether a 250 ml or 500 ml can fits the way drinks will be offered.
What should you check before buying?
Start with the amount in each can and its caffeine declaration, then compare sugar, ingredients and the number of cans needed for the gathering.
| Priority | What to check | Your needs |
|---|---|---|
| Caffeine per can | Read the amount for the whole can, not just per 100 ml. Red Bull UK states 80 mg per 250 ml Original can; Tesco lists 160 mg per 500 ml Monster Ultra can. Account for caffeine from other drinks too. | I want adults to see the caffeine amount before choosing a can, especially if they may also have had coffee, tea or cola. |
| Sugar and sweeteners | Check the nutrition and ingredient labels for the exact variant. Tesco lists 0 g sugars per 100 ml for Red Bull Sugarfree and identifies sucralose and acesulfame K as sweeteners. | Some guests may want a sugar-free drink; I still need to make its ingredients and caffeine content clear. |
| Can and pack size | Check whether each can is 250 ml or 500 ml and how many cans are in the pack. A multipack count does not tell you the caffeine amount in each serving. | For a larger gathering, I want enough individual cans without assuming every guest wants a full 500 ml serving. |
| Choice for other guests | Read high-caffeine warnings on the exact pack and make water and caffeine-free drinks available. NHS pregnancy guidance says caffeine from all sources should not exceed 200 mg a day during pregnancy. | Children and guests who do not want caffeine should have drinks to choose from without taking an energy drink. |
What is easy to overlook?
-
Comparing cans by volume alone
For the specific products cited by Red Bull UK and Tesco, a 250 ml Red Bull Original can contains 80 mg caffeine, while a 500 ml Monster Ultra can contains 160 mg. Choosing a larger can also changes the caffeine amount in that individual serving.
Compare both figures on the cans you plan to offer, and include smaller or caffeine-free options if guests may prefer them.
-
Reading “sugar-free” as “caffeine-free”
Tesco describes Monster Ultra as a zero-sugar drink but lists 160 mg caffeine per 500 ml can. Red Bull Sugarfree also contains caffeine and sweeteners.
Use the sugar declaration to compare sugar, then check caffeine and ingredients separately for each variant.
-
Planning the drinks table without considering every guest
High-caffeine drinks will not suit everyone at a mixed-age gathering. NHS guidance also sets a 200 mg daily caffeine limit during pregnancy, counting caffeine from all sources.
Offer water and caffeine-free refreshments alongside any energy drinks, and keep the pack information available for adults choosing their own cans.
Which brands and formats are relevant?
These brand examples show different can sizes and formulations; the details apply to the named products, not every drink made by each brand.
Red Bull
The 250 ml Original and Sugarfree cans offer smaller individual servings than the 500 ml examples.
- Red Bull UK states that Original contains 80 mg caffeine per 250 ml can.
- Original contains sugar. Tesco lists 0 g sugars per 100 ml for Sugarfree and identifies sweeteners; check the caffeine declaration on the exact Sugarfree pack.
Monster Energy
Monster Ultra is a carbonated, zero-sugar option for adults choosing a 500 ml can.
- Tesco lists 160 mg caffeine per 500 ml can of Monster Ultra.
- Zero sugar does not change that stated caffeine amount; check the exact variant if choosing another Monster drink.
Relentless
Relentless Origin is a 500 ml carbonated drink also listed in multipacks.
- Sainsbury's describes Origin as containing caffeine, taurine, guarana and B vitamins.
- Its high-caffeine label makes the on-can caffeine declaration important when planning individual servings.
Lucozade
Lucozade describes its Energy range as sparkling and containing glucose.
- It is a distinct sparkling-drink option when the brief is not limited to high-caffeine energy drinks.
- Check the exact bottle or can for its ingredients and caffeine declaration rather than treating the range as equivalent to a named high-caffeine product.
Tesco / X
Tesco lists X Classic Taste as a 250 ml carbonated energy drink.
- The Tesco description identifies caffeine, taurine and vitamins.
- Read the can label for caffeine per serving before comparing it with drinks that state a per-can amount.
Joybuy cans and multipacks
These Joybuy options cover smaller 250 ml cans and larger 500 ml cans, including sugar-free variants and packs for serving a group. Choose by the drink and serving size, not the pack count alone.
No image available
Rockstar Blueberry & Pomegranate, 12 × 500 ml
Twelve individual 500 ml cans offer a larger-can format for an adult gathering. Check the caffeine and ingredient declarations on the pack before serving.
No image available
Red Bull Energy Drink Original, 12 × 250 ml
The 250 ml cans offer smaller individual servings for adults; Red Bull UK states that Original contains 80 mg caffeine per can. This is a sugar-containing variant, so check the current pack nutrition label if the precise sugar amount matters.
No image available
Monster Energy Ultra Zero Sugar, 4 × 500 ml
Four 500 ml cans provide a zero-sugar option in a larger serving. Tesco lists 160 mg caffeine per can for Monster Ultra; check the ingredients if guests have sweetener preferences.
No image available
Monster Energy Green Zero Sugar, 12 cans
This zero-sugar variant comes as twelve individual cans for a group. Check the pack for each can's volume, caffeine amount and sweeteners before treating it as interchangeable with Monster Ultra.
No image available
Red Bull Sugarfree Energy Drink, 24 × 250 ml
The 24-pack combines smaller individual cans with a sugar-free formulation. Tesco lists sweeteners including sucralose and acesulfame K for Red Bull Sugarfree; read this pack's caffeine and ingredient declarations before serving.
Street-party drink questions
What should I check if under-16s will be at a street party in England?
Provide drinks other than high-caffeine energy drinks for under-16s. The UK Government announced a planned ban on sales of high-caffeine energy drinks to under-16s in England from April 2027, subject to Parliamentary approval; that announcement is about sales, not a general rule about serving drinks at a party.
How do I compare caffeine in different-sized cans?
Compare the caffeine amount for the whole can and consider caffeine from other drinks. Red Bull UK states 80 mg per 250 ml Original can, while Tesco lists 160 mg per 500 ml Monster Ultra can; those figures describe those specific variants, not every drink in either brand's range.
What if a guest is pregnant?
Have caffeine-free drinks available. NHS guidance says caffeine intake during pregnancy should not exceed 200 mg a day from all sources, including energy drinks, coffee, tea and cola.
Does sugar-free mean caffeine-free?
No. Tesco describes Monster Ultra as zero sugar and lists 160 mg caffeine per 500 ml can. Check the caffeine and ingredient declarations separately on any sugar-free variant you choose.
How should I keep the cans for an outdoor party?
Follow the storage instructions on each pack and arrange chilled drinks for serving. Sainsbury's says Relentless Origin should be stored in a cool, dry place and served cold; avoid leaving cans in direct heat for extended periods.