Hosts offering individual cans
A 250ml can and a 500ml can can have different caffeine amounts even when their labels give the same figure per 100ml. Compare the amount guests would get if they drank the whole can.
Who is choosing the drinks?
Adults looking for a sugar-free option
Check the exact variant rather than the brand name. Monster Energy states 0g sugar per 500ml can for Monster Zero Sugar; sugar-free drinks can still contain caffeine.
Hosts also serving alcohol
Keep energy drinks distinct from alcoholic drinks. Drinkaware warns that caffeine can mask alcohol's sedative effects; it does not make someone less intoxicated.
What should you check?
Start with the whole-can serving, then compare the exact variant's sugar, carbonation and label warnings before deciding what to put out for guests.
| Priority | What to check | Your needs |
|---|---|---|
| Caffeine per can | Read the caffeine figure per 100ml and the can volume; compare the total for a full can. Red Bull's 250ml drink contains 80mg, while Monster Energy lists 160mg for a 500ml Zero Sugar can. | I'd like guests to see how much caffeine is in the can they might finish, particularly if they have also had coffee, tea or other caffeinated drinks. |
| Sugar and sweeteners | Compare sugars on the exact can's nutrition panel, using the same basis: per 100ml or per whole can. Check the ingredients if a guest avoids particular sweeteners. | Some guests may want a sugar-free drink; others may prefer a sweetened flavour. I'd keep the variants clearly labelled rather than treating them as interchangeable. |
| Fizz and flavour | Check that the product is carbonated and read the flavour name on the specific pack. Ingredients and nutrition can differ between flavours. | If I'm offering a flavour choice, I want each option to be a sparkling drink, not simply another product from the same range. |
| Serving alongside alcohol | Identify high-caffeine cans separately from alcoholic drinks and have water and non-caffeinated soft drinks available. Drinkaware says caffeine can mask alcohol's sedative effects. | Where alcohol is served, I don't want an energy drink presented as a way to counter its effects. |
Party-planning pitfalls
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Comparing caffeine per 100ml but not can size
At 32mg caffeine per 100ml, a 250ml can contains 80mg; a 500ml can at the same concentration contains 160mg if finished.
Compare complete cans and bear in mind caffeine from other drinks consumed that day.
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Using an energy drink to counter alcohol's effects
Drinkaware warns that caffeine can mask alcohol's sedative effects, so feeling more alert is not a measure of intoxication.
Keep caffeinated drinks separate from alcohol and make water and non-caffeinated options easy to identify.
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Assuming original and sugar-free variants are alike
A sugar-free label does not mean caffeine-free, and flavours within a range need not share a nutrition panel.
Read the sugar, sweetener and caffeine information on each exact variant you plan to serve.
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Putting high-caffeine cans out for every guest
High-caffeine product labels warn against consumption by children and pregnant or breastfeeding women; some also warn people sensitive to caffeine.
Read each can's warning and provide caffeine-free sparkling drinks for guests who want to avoid caffeine.
Brands and retailers to compare
Red Bull
The 250ml original and Sugarfree cans are compact individual options to compare for an adult party.
- Red Bull states 80mg caffeine in a 250ml original can; Sainsbury's lists 32mg per 100ml for the 250ml Sugarfree variant.
- Sugarfree still contains caffeine. Check the sugar information and warnings on the variant being served.
Monster Energy
Monster Zero Sugar is a carbonated 500ml option for adults who want a larger can without sugar.
- Monster Energy lists 160mg caffeine and 0g sugar per 500ml Zero Sugar can.
- That full can contains more caffeine than the cited 250ml Red Bull examples; compare servings, not just variant names.
Relentless
A flavoured carbonated range that includes 500ml Origin and Guava examples.
- Sainsbury's lists Relentless Origin at 32mg caffeine per 100ml, or 160mg for a full 500ml can.
- Check the individual flavour's ingredients, nutrition and warnings rather than applying Origin's figures across the range.
Lucozade Alert
Lucozade describes Alert as a sparkling drink range; its Original variant is a 500ml option.
- The Lucozade Alert Original product information lists 19.1g sugars per 500ml.
- Read the caffeine declaration and warning on the exact can before serving it.
Tesco and Sainsbury's
These are retailers, not energy-drink brands. Their listings can help identify the exact can or pack you intend to buy.
- Tesco lists Red Bull, Monster and Relentless lines; Sainsbury's provides product information for individual variants.
- Confirm the current pack and local availability before planning quantities for the party.
Sparkling energy drinks on Joybuy
These options cover smaller 250ml cans and flavoured or zero-sugar 500ml cans, sold in multipacks. Compare the caffeine in one can before deciding which packs suit your adult guests.
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Monster Energy Aussie Style Lemonade, 4 × 500ml
A lemonade-flavoured carbonated option in a four-can pack. The product information states 160mg caffeine per 500ml can and 5.0g sugars per 100ml; read the can's warning before serving.
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Rockstar Blueberry & Pomegranate, 12 × 500ml
A fruit-flavoured carbonated option in a 12-can pack. The product information states 200mg caffeine per 500ml can; check the sugar panel and high-caffeine warning on the exact can.
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Monster Energy Green Zero Sugar, 12 cans
A carbonated zero-sugar option in 500ml cans. The product information gives 0g sugars and 160mg caffeine per can; a full can is not equivalent to a smaller serving when comparing caffeine.
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Red Bull Sugarfree, 4 × 250ml
A smaller sugar-free sparkling can for guests who prefer that serving size. The product information lists 0g sugars per 100ml; Sainsbury's lists 32mg caffeine per 100ml for the UK 250ml Sugarfree drink, equivalent to 80mg per can.
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Red Bull Spring Edition Cherry Sakura, 4 × 250ml
A cherry-flavoured sparkling option in smaller cans. The product information lists 32mg caffeine and 11g sugars per 100ml; check the full-can serving and label warnings before putting it out for guests.
Common questions
Should I use energy drinks as mixers at a New Year's Eve party?
Do not use them as a way to counter alcohol's effects. Drinkaware says caffeine can mask alcohol's sedative effects; keep energy drinks separately identified and offer water and non-caffeinated soft drinks.
Why compare caffeine per can rather than per 100ml?
Guests may drink the whole can, and can sizes differ. Red Bull states 80mg caffeine in its 250ml original can, while Monster Energy lists 160mg in a 500ml Zero Sugar can; check each exact product label before serving.
What should I offer guests avoiding caffeine?
Offer a clearly identified caffeine-free drink rather than assuming a sugar-free energy drink is caffeine-free. High-caffeine can labels warn against consumption by children and pregnant or breastfeeding women; the NHS also identifies energy drinks as a caffeine source during pregnancy.
What does the high-caffeine warning tell me?
The UK Department of Health and Social Care states that drinks other than tea or coffee containing more than 150mg caffeine per litre require a warning that they are not recommended for children or pregnant or breastfeeding women. Read the caffeine figure on the individual can and use its volume to compare full servings.