How Many Syns In Mega Marshmallows? Find Out Here!

Updated on 
2 February, 2023

How Many Syns In Mega Marshmallows? Are They High In Syns?

If you are grabbing some Mega marshmallows for making smores, camping or baking, then you will need to ensure your tracking the syns in these sweet treats to stay on track with your SW plan.

Are Mega Marshmallows High In Syns?

Mega marshmallows have on average 3.5 syns for a 20g serving, making them fairly low in syns, you could have up to four before using all your 15 daily syns. 

We've put together a great syn guide below which will discuss why Mega marshmallows are low in syns on the SW plan, syn values of marshmallows and a great recipe for using mallows below which is SW friendly!

Why Are Mega Marshmallows Low In Syns?

At just 3.5 syns a serving for these large marshmallows, mega marshmallows are fairly low in syns allowing you to have up to four before using all your 15 daily syns.

Marshmallows, in general, are very low in calories but can be high in sugar so we, therefore, recommend having them in moderation.

If making smores out of mega marshmallows you also need to consider the syns in biscuits and the chocolate which can add on extra syns.

Syn Values Of Mega/Regular Marshmallows

Marshmallows can have varying syns according to their size, we've listed their syn values below to help you out.

Syn Values Of Mega/Regular Marshmallows
  • Rocky Mountain Mega Marshmallow 340g - 16 syns for 100g.
  • Mega Marshmallows 550g - 3.5 syns.
  • Frisia Mega BBQ Marshmallows 300g - 7.5 syns.
  • Baking Buddy Mega Marshmallows 400g - 4 syns.
  • Tesco Marshmallows 200g - 4 syns.
  • Tesco Pink & White Mini Marshmallows 100g - 4 syns.
  • Mallow & Marsh Raspberry Marshmallow Bar Coated in 70% Dark Chocolate 35g - 6.5 syns.
  • HARIBO Chamallows Pink & White Marshmallows Bag 70g - 4 syns.
  • Tunnock's Snowballs Coconut Covered Marshmallows 6 x 30g (180g) - 6.5 syns.
  • Aldi The Pantry Pink & White Mini Marshmallows 180g - 1.5 syns.
  • Mallow & Marsh Vanilla Marshmallows Coated in Milk Chocolate 100g - 7 syns.
  • Lidl Sweet Corner Marshmallows 300g - 4 syns.

Our SW Marshmallow Bar Recipe

If you've got some mega marshmallows for baking or maybe some leftovers from smores, you might be wondering how to use up the rest of them in an SW-friendly way?

Well, we've got a great SW recipe below to check out for making marshmallow bars below having 5 syns per one!


  • 150g of oats.
  • 150g of bananas.
  • Three eggs.
  • Six spoons of sweetener.
  • Half a cup of natural fat-free yoghurt.
  • A drop of vanilla extract.
  • 40g of marshmallows.
  • 15g of dark choc chips.


  1. Start by heating your oven to gas mark 5 then mash your bananas and add them to a bowl with sweetener and the oats.
  2. Next add in the yoghurt, egg and vanilla and mix.
  3. Now line a baking tray and pour in the mix then top with your chocolate then the rest of the mix and bake for 45 minutes, allow to cool, slice into squares and serve!
Our SW Marshmallow Bar Recipe

Final Words

Overall, mega marshmallows are low in syns, having 3.5 syns per marshmallow allowing you to have up to four 20g servings before using all your 15 syn daily allowance. Marshmallows are a great low-syn sweet treat to have on the SW plan but we suggest having them in moderation since they can be high in sugar.

Jennifer is a certified nutritionist and weight loss coach with a Master's in Nutrition from Cambridge. With over 10 years experience, she shares healthy recipes and science-backed slimming tips on SheCooksSheEats to help people reach their wellness goals. Jennifer stays up-to-date by regularly attending conferences and continuing her nutrition education. She aims to provide research-backed advice to inspire balanced, happy living.
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