How Many Syns In Roast Potatoes Cooked In Oil? Find Out Here!

Updated on 
26 August, 2022

Are Roast Potatoes Cooked In Oil High In Syns? - Our SW Syn Guide

If you're cooking up a Sunday roast and want to traditionally cook your roasties in some oil, you might be curious as to how many syns the extra oil can add to your meal on the slimming world plan.

Are Roast Potatoes Cooked In Oil High In Syns?

Roast potatoes cooked in oil have between 5-10 syns for a 100g portion on the slimming world plan making them quite high in syns, this is due to the added fat from the oil. 

Down below in our syn guide, we will take you through why roast potatoes are high in syns, some syn values and how to make your SW-friendly roasties to help you save syns.

Why Are Roast Potatoes Cooked In Oil High In Syns?

At 5-10 syns for a 100g serving, roast potatoes can be very high in syns, this is because the oil adds a lot of extra fat to the potatoes. For example, roast potatoes cooked in sunflower oil can have up to 10 syns a serving and anything between 3-5g of fat depending on how much oil is used.

To save syns we recommend cooking roast potatoes in low cal cooking spray instead which can reduce the fat content of your potatoes since potatoes are syn-free on the plan.

Syn Values Of Roast Potatoes

Depending on the amount of oil they are cooked in, roast potatoes can have a variety of syns, to help you compare, we've listed a variety of different types and syn values down below.

Syn Values Of Roast Potatoes
  • 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.
  • Lidl Deluxe Roast Potatoes with Goose Fat 1kg - 16.5 syns for 150g.
  • 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.
  • M&S Roasting Potatoes with Goose Fat 450g - 9 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.
  • Tesco Finest Lemon and Thyme Roast Potatoes Meal Deal 400g - 7 syns.

Our Best SW Roast Potatoes Recipe

A great way to enjoy syn-friendly roasties with your dinner is by making your own at home, we've listed a recipe down below to help you out.


  • 900g of potatoes for roasting.
  • Chicken stock.
  • Low cal cooking spray.
  • Seasoning.


  1. Begin by peeling your potatoes and chopping them up, bring them to a boil in some water with your stock then allow them to sit for five minutes in the pan.
  2. Preheat your oven to gas mark 8 then shake up the potatoes in a sieve, spray them with some oil and season, line a baking tray and roast for around an hour.
Our Best SW Roast Potatoes Recipe

Last Words

Overall, roast potatoes cooked in oil do have syn on the SW plan having between 5-10 syns for 100g, this is because the oil adds lots of fat to the potatoes. In order to save syns we suggest only cooking your roasties in spray oil.

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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