Slimming World Calculator for Free – 2024

Check out the Syn Calculator to help you on your Slimming World journey.

Anyone who has followed the Slimming World plan would of heard the word “Syn” being mentioned..

Syns are a way of still getting in some of your favourites or naughty treats. Chocolate, crisps. cocktails, booze… the list is endless. Everything that is not a free food has a Syn value and can be found In the Slimming World database after signing up to the plan. 

Your Syn allowance depends on your weight and the allowance is greatly different between male and female. Visit for more information.

So is there really a way to calculate Syns for free?

Honestly, not without signing up to membership with Slimming World. But if you are happy to trust the rough guess method which has always circulated forums and chat groups. 

When calculating naughty treats such as alcohol, crisps, chocolate (i.e items that do not contain a “free” option) you can use the theory 

20 Calories = 1 Syn

But this can never be 100% trusted and is only a rumour! If you want to ensure you are following the plan correctly we would always recommend signing up to membership. You could end up gaining weight if you do not follow the plan correctly. 

What Slimming World says about this theory….

Our wonderful Syns team take into account a number of different things when working out the Syn value of foods so although it’s not a formula as such, there is some method behind each and every Syn value 🙂

You may spot on social media sites that many members use a 20 calories = 1 Syn rule and although this does work for some items, it doesn’t work for all so to really protect your weight losses, we would always recommend checking the Syns Online database (where we have done the hard work for you), and if the item you need isn’t listed, pop the nutritional information into the Syns Calculator and you will never be without a Syn value again.

How Can I Track My Syns?

Check out my amazing Syn tracker chart, print your own…

3 Responses

  1. Rebecca Jones says:

    This theory always works for me! I 100% trust it and I have lost 8 stone.

  2. bernadette fairley says:

    How many grams of potatoes uncooked and rice uncooked is classed as free on slimming world

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