Protein per 100g rankings
The top 10 protein bars by protein per 100g — and the brands that actually deliver:
1. Grenade Carb Killa White Chocolate Cookie
2. Fulfil Mixed Pack
3. Fulfil Chocolate Salted Caramel
4. Barebells Cookies & Cream
5. Myprotein Protein Crispy Wafer Vanilla
Grenade and Fulfil dominate the top spots, averaging 35g and 35.4g protein per 100g respectively. But notice the outlier: Myprotein Crispy Wafer has 37g protein but 14g sugar — a reminder that protein content alone doesn't tell the whole story.
Best protein per pound spent
If you're buying protein bars on a budget, the per-pound ranking flips the leaderboard:
1. Warrior RAW Flapjack Peanut Butter Cup
2. Nature Valley Protein Salted Caramel
3. Nature Valley Protein Peanut & Chocolate
The cheapest bar (Warrior RAW at £1) delivers more protein per pound than bars costing nearly 3x as much. Grenade and Fulfil, while high in protein per 100g, drop to mid-table when measured by value.
Warrior RAW Peanut Butter Cup: £1 for 20g of protein
At 26.8g of protein per pound, it's the best protein value at Tesco — despite being one of the cheapest bars on the shelf.
Plant-based picks
19 protein bars at Tesco are plant-based with 10g+ protein per 100g:
1. Misfits Caramel Fudge
2. Misfits Cookie Butter
3. Misfits Brownie Batter
4. Huel Dark Chocolate & Raspberry
5. Trek High Protein Choc Caramel
Misfits lead the plant-based category with 28–29g protein per 100g — competitive with mainstream whey-based bars. They also have the lowest sugar of any brand at just 1.4g average.
Protein-to-sugar ratio
The protein-to-sugar ratio reveals which bars give you the most protein for the least sugar:
1. Grenade Dark Chocolate Mint
2. Misfits Caramel Fudge
3. Misfits Brownie Batter
A ratio above 10:1 is excellent. Below 2:1 means you're getting almost as much sugar as protein.
Get the full protein rankings for all 70 bars
Every product ranked by protein per 100g, protein per pound, protein-to-sugar ratio, and plant-based picks.
What can you do with this?
SpikeSaver is a Chrome extension that analyses every product on Tesco.com against your health goals — including protein content, macros, and more — so you can make informed choices without reading every label.
If you want to understand the protein reality of protein bars, start with the report above. If you want to make better choices every time you shop, start using SpikeSaver while you shop →
Know someone who tracks their protein?