Syn values

How Many Syns in Rapeseed Oil?

By Jenny Updated 26 April 2026

Rapeseed Oil is a low-syn option on Slimming World at 2 syns per 1 tsp (5ml) — it fits easily within a standard daily syn allowance. Popular UK cooking oil; syn the same as other vegetable oils. Cooking oils are one of the stealthiest sources of high syns on Slimming World. A tablespoon of any oil adds five to seven syns, and it is very easy to pour more than you mean to. Switching to a calorie-controlled cooking spray like Frylight — which is completely free on plan — is consistently one of the most impactful changes new members make, saving 10 syns or more per day in cooking alone.

Per serving

Rapeseed Oil — syn values

Portion	Syns	kcal
1 tsp (5ml)	2	44
1 tbsp (15ml)	6	132

Numbers at a glance

Quick auto-calculated stats for Rapeseed Oil.

13%

of a 15-syn day

based on standard daily allowance

22kcal / syn

calories per syn

the lower, the more 'value' your syns get

portion sizes covered

from snack to full serving

2syns

cheapest portionat 1 tsp (5ml)

smallest serving

Quick facts

Rapeseed Oil is 2 syns per 1 tsp (5ml)
2 portion sizes covered in the table below
Lowest portion: 2 syns (1 tsp (5ml))
Highest portion: 6 syns (1 tbsp (15ml))
Not Healthy Extra eligible
Not a free food — counts toward daily syns
Popular UK cooking oil; syn the same as other vegetable oils.

How Rapeseed Oil compares

At 2 syns for the smallest tracked portion, Rapeseed Oil sits below most oil options on Slimming World — typical syn values for oil range from 2.0 to 5.0 syns per portion, with the median around 2.5 syns. Knowing where Rapeseed Oil sits in that range helps you decide whether it earns its place in your day or whether a swap saves you syns for something else.

When to choose Rapeseed Oil on Slimming World

Rapeseed Oil works as a regular daily option on Slimming World — at this syn level it fits easily into any allowance without forcing you to save syns or trade off elsewhere. Counting it in at the start of the day rather than adding it on retrospectively keeps your tracking accurate and means you always know how much of your daily allowance is left for anything else you fancy.

Common Slimming World mistakes with Rapeseed Oil

The standard mistake with Rapeseed Oil is pouring instead of measuring. A "glug" into a pan is typically 2 to 3 tablespoons, which is 12 to 18 syns from the oil alone before any food has been added. Switching to a calorie-controlled cooking spray like Frylight removes this entirely at zero syns. If you do use measured oil, levelling the spoon properly matters — a heaped teaspoon is closer to two.

Daily tips for Rapeseed Oil

At 2 to 4 syns for a standard serving, Rapeseed Oil fits comfortably into most days without requiring any special planning. The most effective approach is to count it in at the start of the day rather than adding it up at the end — this way it does not feel like a surprise.

If you use Rapeseed Oil regularly, look at the full table above to find the portion that gives you the best value. Smaller, more intentional portions often provide the same satisfaction as a larger casual serving for noticeably fewer syns.

FAQs

Is Rapeseed Oil free on Slimming World?

No, Rapeseed Oil is not free on Slimming World. A 1 tsp (5ml) is 2 syns. You can absolutely include it on plan — it just needs to be counted within your daily syn allowance of 5 to 15 syns. Most people find 10 to 15 syns comfortable and still lose weight consistently.

How many syns is Rapeseed Oil per serving?

A 1 tsp (5ml) of Rapeseed Oil is 2 syns on Slimming World, with approximately 44 calories. The full breakdown by portion size is in the table above, which covers all common serving sizes.

What is the best cooking fat to use on Slimming World?

Frylight cooking spray — available in olive oil, sunflower, coconut, and butter varieties — is completely free on Slimming World and the go-to replacement for all cooking oils. A few sprays provide enough fat for frying, roasting, and baking at zero syns. Lurpak Cooking Mist spray is another free option. Any measured oil, even extra virgin olive oil or coconut oil, costs 2 syns per teaspoon. Switching from pouring oil to using spray is one of the most consistent syn-savers on the plan.

What are lower-syn alternatives to Rapeseed Oil?

Frylight cooking spray is the go-to free alternative to all cooking oils. Available in olive oil, sunflower, coconut, and butter flavours, a few sprays coat a pan or roasting tray at zero syns. Lurpak Cooking Mist spray is another free option. Using vegetable stock or a splash of water for sautéing vegetables is also free and works well for onions, garlic, and leafy greens. If you are looking for more specific alternatives to Rapeseed Oil, the syn table above can help you compare portion sizes and find a serving that fits your allowance better.