Syns in Tomato Ketchup: Complete Slimming World Guide

Updated on 
9 March, 2026

Is Tomato Ketchup Slimming World Friendly? Can I Have Heinz Ketchup On The Plan?

A bottle of ketchup is a staple in many of our kitchens, accompanying chips, eggs, pizza, you name it, but on the slimming world plan, can you have ketchup? Or is it high in syns?

Is Tomato Ketchup Slimming World Friendly? Can I Have Heinz Ketchup On The Plan?

Ketchup on average has 1 syns for a 15g tablespoon, making it low in syns, but should be used within moderation, we recommend weighing it out or measuring the condiment to stay on track with your syns.

In our syn guide below, we will discuss why ketchup has syns, some syn values of ketchup and some low syn alternative condiments for dipping or as a side.

Why Does Ketchup Have Syns On Slimming World?

At around 0.5 syns to 1 syn for a 15g tablespoon, you might be wondering why ketchup has syns on the slimming world plan? Most ketchup has syns due to the high sugar content, having nearly 3g of sugar for just one tablespoon.

You could have up to 15 tablespoons of ketchup before using up your daily syn allowance, therefore we would suggest not using squeezy ketchup over your food since you can end up using more ketchup than you think.

Is Heinz Ketchup High In Syns?

In terms of the type of ketchup, many of us pick Heinz ketchup as a staple over other brands, this type of ketchup also has 1 syn a tablespoon, making it low in syns, but should be used in moderation since it also contains 3.5g of sugar for just a spoon.

To save syns you could always use their reduced sugar version which only has 0.5 syns a tablespoon instead.

Syn Values Of Ketchup

Ketchup has a similar syn value no matter where you buy it from and the brand, to help you compare, however, we've listed some syn values of ketchup down below.

Syn Values Of Ketchup
  • Heinz Tomato Ketchup 570g - 1 syn.
  • Heinz 50% Less Sugar & Salt Tomato Ketchup 435g - 0.5 syns.
  • Aldi Bramwells Tomato Ketchup 50% Less Sugar And Salt 650g - 0.5 syns.
  • Aldi Bramwells Tomato Ketchup 650g - 1 syn.
  • Tesco Tomato Ketchup 990g - 1 syn.
  • Asda Classic Tomato Ketchup 720g - 1 syns.
  • Tesco Reduced Sugar & Salt Tomato Ketchup 945g - 0.5 syns.
  • McDonald's Tomato Ketchup Dip 21ml - 1.5 syns.
  • Sainsbury's Tomato Ketchup 680g - 1 syn.
  • ASDA Tomato Ketchup 50% Reduced Sugar & Salt 530g - 0.5 syns.
  • Tesco Stockwell & Co. Tomato Ketchup 540g - 0.5 syns.
  • The Skinny Food Co. Tomato Ketchup Flavour Sauce with Sweetener 425ml - Syn free.
  • Lidl Batts Tomato Ketchup 560g - 1 syn.
  • M&S Tomato Ketchup 495g - 1.5 syns.
  • Daddies Tomato Ketchup 400g - 1 syn.
  • Morrisons Tomato Ketchup 1kg - 1 syn.
  • Asda Smart Price Tomato Ketchup 530g - 1 syn.
  • Heinz Organic Tomato Ketchup 580g - 1 syn.
  • Hubbard's Foodstore Tomato Ketchup 460g - 1 syn.

Low Syn Alternatives To Ketchup

If you find ketchup to be too high in syns, or your looking for another low syn dip to spice up your meals, we've listed some other low-syn alternative condiments for you to check out below.

  • Heinz Seriously Good Mayonnaise Light 815G - 2 syns.
  • Heinz Seriously Good Mayonnaise 775G - 5 syns.
  • Hellmans Real Mayonnaise 800G - 5 syns.
  • Colman's Original English Mustard 170G - 0.5 syns.
  • Nandos Squeezy Perinaise 265G - 2.5 syns.
  • Hp Top Down Brown Sauce 450G - 1 syn.
  • Hellmann's Vegan Mayonnaise 270G - 5 syns.
  • Tesco Mayonnaise 450Ml - 5 syns.
  • Tesco Wholegrain Mustard 180G - 0.5 syns.
  • Tesco Salad Cream 450Ml - 1.5 syns.
  • Tesco Bbq Sauce 440G - 1 syn.
  • Nandos Medium Peri-Peri Sauce 125G - 0.5 syns.
  • Daddies Brown Sauce 400G - 1 syn.
  • Nando's Sweet Chilli Jam Medium 285G - 1 syn.
  • Heinz Sandwich Spread 300G - 2 syns.
Low Syn Alternatives To Ketchup

Last Words

To conclude, ketchup is typically low in syns, having around 1 syn a tablespoon, to reduce syns we suggest opting for lower per cent sugar options which often have fewer syns, around 0.5 syns a serving. To keep on track with syns you should ensure you are measuring out your portion rather than using squeezy versions or check out our low syn alternatives above for a new condiment to pair with your dish.

Frequently Asked Questions

How are syn values calculated?

Syn values are calculated using a formula based on calories, saturated fat and sugar content per serving. They’re not the same as calories — a product can be low in calories but higher in syns if it’s high in sugar or fat. Always check the official Slimming World app for the most accurate and up-to-date syn values.

Do syn values change?

Yes. When manufacturers reformulate their products, the syn value can go up or down. This is why we recommend double-checking with the Slimming World app or your consultant, especially if a product’s packaging has changed recently.

How many syns should I have per day?

Most Slimming World members work with 5 to 15 syns per day. Your consultant will advise on the right amount for you. The key is to use your syns on the things you enjoy most — whether that’s a chocolate bar, a glass of wine, or a packet of crisps.

Jennifer
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.
View Bio

Related Articles

Leave a Reply

Your email address will not be published. Required fields are marked *

crossmenuarrow-leftarrow-right

Free Syn Cheat Sheet

200+ foods with syn values & calories.
Print it, stick it on the fridge!

No spam. Unsubscribe anytime.
linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram