How Many Syns In Roast Potatoes? Find Out Here!

Updated on 
3 August, 2022

How Many Syns In Roast Potatoes - lard or oil? - Our Slimming World Syn Guide

Roast potatoes are an essential part of any roast dinner, but are often cooked in fat and oil, which begs the question, are they high in syns on slimming world?

Are Roast Potatoes High In Syns On Slimming World?

Roast potatoes do have syn on slimming world, with the average serving of 100g having between 5-10 syns when brought from the supermarket or at a restaurant, making them high in syns and therefore should be consumed within moderation. 

Down below, we will discuss in more detail why roast potatoes have syns on slimming world, syn values of roast potatoes as well as an SW recipe for making your syn free roasties at home!

Why Are Roast Potatoes So High In Syns?

At 5-10 syns for 100g, roast potatoes can be very high in syns depending on how they are made. Roast potatoes get their high syn values from the fat and oil they are stored in and used to cook with, otherwise, potatoes are syn-free on the slimming world plan.

For example, roast potatoes from Toby Carvery a chain restaurant have around 5.5 syns a serving since they are stored in beef drippings. In oil, the syns might be even higher, for example, Tesco's roast potatoes with sunflower oil have 9.5 syns a serving and up to nearly 3g of fat.

Syn Values Of Roast Potatoes

Roast potatoes have varying syns according to the types of fat they are cooked with or oil, to help you compare syns, we've listed some popular values down below.

Syn Values Of Roast Potatoes
  • Tesco Roast Potatoes 800G - 9.5 syns.
  • Tesco Finest Beef Fat Roast Potatoes 800G - 7.5 syns.
  • Toby Carvery Beef Dripping Roast Potatoes - 5.5 syns.
  • Aunt Bessie's Duck Fat Roast Potatoes 700G - 8 syns.
  • Tesco Crispy Roast Potatoes 450G - 13 syns.
  • Aunt Bessie's Crispy & Fluffy Roasties 1.3Kg - 8 syns.
  • Aunt Bessie's Homestyle Mini Roasties 700G - 7 syns.
  • Tesco Mini Roast Potatoes with Garlic-Infused Oil 500g - 5 syns.
  • Slimming World Roast Potatoes 1kg - 5 syns.
  • Asda Crispy Roast Potatoes 800g - 6 syns.
  • Aldi Four Seasons Crispy Roast Potatoes - 8 syns.
  • Aldi Specially Selected Goose Fat Roast Potatoes 1kg - 9.5 syns.
  • Co-op Frozen Roast Potatoes 750g - 5 syns.
  • Morrisons Roast Potatoes 1kg - 6 syns.
  • Sainsbury's Roast Potatoes 900g - 7 syns.
  • Asda Crisp & Fluffy Roast Potatoes 400g - 6 syns.
  • M&S Roasting Potatoes with Goose Fat 450g - 9 syns.
  • Tesco Finest Lemon and Thyme Roast Potatoes Meal Deal 400g - 7 syns.
  • Lidl Deluxe Roast Potatoes with Goose Fat 1kg - 16.5 syns for 150g.

Our Best SW Recipe For Making Roast Potatoes

If you find regular roast potatoes to be too high in syns, why not make your own slimming world friendly roast potatoes at home?

Our recipe below is syn-free and serves four people.


  • 1kg of roasting potatoes.
  • Chicken stock or veggie stock.
  • Low cal cooking spray.
  • Salt.


  1. Start by peeling and chopping your potatoes then add them to a pan with your chosen stock and bring them to a boil in the water, remove them from the heat and allow them to sit in the pan for 5 minutes.
  2. Heat your oven to gas mark 7, drain the potatoes and shake them in a sieve to help rough them up, spray them with oil and season well, tossing to make sure they are seasoned evenly.
  3. Line a baking tray and allow them to roast for about 40-45 minutes.
Our Best SW Recipe For Making Roast Potatoes

Last Words

To conclude, roast potatoes can be very high in syns since they often contain drippings or oil to keep them separate and for cooking. Since potatoes are syn-free, we recommend making your own slimming world friendly roast potatoes when you have time with low-cal cooking spray in order to save syns.

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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