How Many Syns In Marshmallows? Find Out Here!

Updated on 
9 July, 2022

Are Marshmallows High In Syns? - Our Slimming World Syn Guide

If you are looking for a sweet snack, or maybe you fancy some marshmallows with your hot chocolate, you might be wondering how many syns marshmallows have.

Marshmallows on average have 1.5 syns per marshmallow, this can change however depending on the size of the marshmallows, with mini marshmallows having fewer syns.

We've put together a short guide below which will take you through how many marshmallows you can eat in the slimming world, some syn values as well as two recipes for making your own SW marshmallow bars!

How Many Marshmallows Can I Eat On Slimming World?

At 1.5 syns per marshmallow, you could have up to 10 marshmallows before using up all of your 15 syn daily allowances, making them a great low syn sweet treat.

Marshmallows are low in syns since they are mainly just made of air, but you should still eat these sweets in moderation since they are high in sugar having up to 16g for an average 25g serving. Alternatively, you can have sugar-free marshmallows which are healthier and still low in syns.

Syn Values Of Marshmallows

Marshmallows all have a similar syn value no matter where you buy them from, but their values can differ according to the different sizes.

We've listed some popular syn values down below.

  • Tesco Marshmallows 200g - 4 syns.
  • Tesco Pink & White Mini Marshmallows 100g - 4 syns.
  • HARIBO Chamallows Pink & White Marshmallows Bag 70g - 4 syns.
  • Tunnock's Snowballs Coconut Covered Marshmallows 6 x 30g (180g) - 6.5 syns.
  • Epic Giant American Style Toastin' Marshmallows 600g - 4 syns.
  • Mallow & Marsh Salted Caramel Marshmallows 85g - 4 syns.
  • Aldi The Pantry Pink & White Mini Marshmallows 180g - 1.5 syns for 30g.
  • Mallow & Marsh Vanilla Marshmallows Coated in Milk Chocolate 100g - 7 syns for 30g.
  • Sainsbury's Marshmallows 200g - 5 syns.
  • Lidl Sweet Corner Marshmallows 300g - 4 syns.
  • Princess Mallows Pink & White Marshmallows 190g - 9 syns for half.
  • Asda Marshmallows 200g - 4 syns.
  • Sainsbury's Pink & White Vanilla Mini Marshmallows 180g - 1 syn.
  • Co-op Marshmallows 160g - 4 syns for three.
Syn Values Of Marshmallows

Our Best SW Marshmallow Recipes

Since marshmallows are low in syns, you can use them for a variety of recipes and sweet snacks, we've listed two slimming world marshmallow bars recipes down below to give you some baking inspo.

Marshmallow Bars


  • 40g of sugar free marshmallows.
  • 40g of oat cheerios.


  1. Melt your marshmallows at five-second intervals in the microwave then stir in the oat cereal quickly, place into a square container or bowl then allow the mix to set in the fridge for at least 30 minutes before cutting into slices.

Marshmallow & Oat Bars


  • 150g of oats.
  • Three eggs.
  • 180g of bananas.
  • 50g of marshmallows.
  • Drop of vanilla extract.
  • Six spoons of sweetener.
  • 100ml of plain fat-free yoghurt.
  • 20g of chocolate chips.


  1. Begin by mashing up your bananas then heating your oven to gas mark 6, combine with your oats and the sweetener in a bowl.
  2. Add your vanilla, egg and yoghurt to the mix. Line a baking pan and pour half of this oat mixture into it, pressing down, and top with chocolate chips.
  3. Press down the rest of the mix on top and bake for around 40 minutes.
  4. Top with your marshmallows and grill until toasted. Cut into squares and enjoy!
Our Best SW Marshmallow Recipes

Final Words

To conclude, Marshmallows are a very low-syn sweet snack, having only 1.5 syns per mallow and even less if you opt for the sugar-free or mini versions.

We recommend using these in baking or as a quick sweet snack thanks to their low syn value, they can be very high in sugar however so be mindful as to how many you are eating.

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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