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A half marathon sits in that sweet spot. Long enough to demand a solid fuelling plan, short enough that you can still race it hard. Whether you are chasing a PB or soaking up the atmosphere, getting your energy right can make the difference between finishing strong and fading over the final 5K.
Energy bars can play a useful role in your half marathon strategy. They are convenient, easy to carry, and ideal in the lead-up to the race or during longer training runs. The key is knowing when and how to use them.
A half marathon will typically take between 1 hour 20 minutes and 3 hours for most runners. Your body relies heavily on carbohydrate stores, particularly muscle glycogen. Once those stores start to dip, pace and perceived effort can change quickly.
Energy bars are primarily useful:
On race day itself, many runners prefer gels for quicker absorption, but bars can still work well if you tolerate solid food and break them into small bites.
Let’s look at some of the best options for half marathon training and racing:
Inside each wrapper is one bar split into 2 halves, making it ideal for portion control. With a balance of carbohydrates and a light texture, it is easy to digest before a session or race.
For half marathon runners, this is a strong option 60 to 90 minutes before the start. You can eat one half as a top-up without feeling too full, helping you toe the line energised but comfortable.
Maurten Solid 160 is designed with performance in mind. Each pack delivers 40g of carbohydrate, split into two smaller portions, making it easy to control intake. The texture is soft and easy to chew, with a neutral flavour that sits well before harder efforts.
This is an excellent choice 2 to 3 hours before your race, or as part of your carb-loading strategy the day before. There is also the Solid C 160, which also provides 40g carbs from 2 mini-bars in a delicious cocoa flavour.
STYRKR BAR30 delivers 30g of carbohydrate in a compact, easy-to-handle bar, making it a practical option for endurance athletes who want controlled, measurable fuel. Built around a dual-carb approach, it supports steady energy release without feeling overly heavy.
For half marathon runners, BAR30 works well as a pre-race top-up 60 to 90 minutes before the start, or during longer training sessions where you are practising hitting 30 to 60g of carbs per hour.
Veloforte Energy Bars are made with natural ingredients such as dates, nuts and real fruit. They provide a steady release of energy and are ideal for longer training runs in your half marathon build-up.
Because they contain a little more fibre and fat than ultra-refined race bars, they are often better suited to training rather than the final hour before a race. Use them on steady long runs to practise fuelling and build confidence in your nutrition strategy.
Should I eat an energy bar during a half marathon?
Most runners prefer gels during the race itself because they are easier to consume at pace. Bars are usually better before the start or during training.
How many carbs should I aim for in a half marathon?
Typically 30 to 60g of carbohydrate per hour, depending on pace and tolerance. Faster runners closer to 90 minutes may need less total intake than those racing for 2 hours or more. You can use our Nutrition Calculator to work out how many you will need.
Are natural energy bars better than performance-focused bars?
Not necessarily better, just different. Natural bars can be great for training, while lower-fibre, performance-focused bars are often more suitable close to race time.
The best energy bar for a half marathon depends on when you plan to use it.
Practise with your chosen bar in training, refine your timing, and arrive at the start line confident that your fuelling supports your performance, not works against it.
