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Gear that pairs with the calculators
Categories rather than picks. Each one connects to a specific number one of the tools on this site produces.
The links below are Amazon affiliate links. As an Amazon Associate, calculaterun.com earns from qualifying purchases. This costs you nothing and changes nothing about what is recommended. Each link opens a search rather than a single product, so you can compare current prices and reviews yourself. No manufacturer has paid for placement here, and no product has been reviewed by this site.
Energy gels
Run your numbers through the fuelling planner first, then buy to that figure. The thing worth knowing before you order: gels vary widely in carbohydrate content per sachet, from about 20 grams to over 40, and in whether they use a glucose-fructose blend. If your plan calls for 70 grams an hour, the difference between a 22 g gel and a 40 g gel is whether you carry three per hour or two. Buy a mixed pack and test flavours in training, because gut tolerance is individual and race day is the wrong time to find out.
Browse energy gels on Amazon →
Hydration vests and bottles
If your fluid plan calls for more than about 250 ml per drinking opportunity, carrying beats relying on cups — drinking that volume from a paper cup while moving is not realistic. Soft flasks collapse as they empty and do not slosh; rigid bottles do. Capacity should follow your measured sweat rate, not the vest’s marketing.
Browse hydration vests and bottles →
GPS watches
The field version of nearly every tool on this site. Worth knowing: GPS pace is noisy over short intervals and reliably over-measures distance because it records the path your wrist took rather than the course. For interval work, a watch with a decent optical or chest-strap heart rate reading matters more than GPS precision.
Anti-blister socks and anti-chafe balm
The cheapest performance upgrade in the sport, and the one most people skip until the first long hot race teaches them. Both problems are friction problems, both compound with duration and moisture, and both are effectively unfixable once they start. Apply balm before you think you need it.
Browse anti-blister socks → · Browse anti-chafe balm →
Headlamps
For dawn miles, dusk miles, and the long night in the middle of any hundred-miler. Beam pattern matters more than raw lumens: a wide flood close to your feet beats a narrow spot for trail footing, and battery life at your actual brightness setting is usually well below the advertised figure.
Foam rollers and recovery
The mileage progression only works if the legs recover between weeks. The evidence for foam rolling is stronger for short-term range of motion and perceived soreness than for any deep tissue effect, which is a modest claim and still worth the ten minutes.