How elite athletes fuel in 2026

Stop guessing.
Start fueling.

The endurance fueling calculator built on the same science the world's fastest athletes use on race day. Zone-based. Duration-tiered. Dialed to the gram.

Build Your Fuel Plan →
8
Elite fueling protocols
0-120+
g/hr range, zone-based
1 page
Printable race day sheet
The Methodology

Not generic advice.
A decision framework.

Every other calculator tells you "take 30-90g carbs per hour." That's useless. FuelSheet uses the same zone-based, duration-tiered protocols elite athletes rely on to tell you exactly how much, and when.

01
Easy days (Z1/Z2) under 1 hour
0 g/hr
02
Easy days, 1-2 hours
45-60 g/hr
03
Easy days, 2+ hours
60-75 g/hr
04
Easy/moderate long runs (ultra-style effort)
75-90 g/hr
05
Moderate/hard days (Z3+) under 90 min
60 g/hr
06
Moderate/hard days, 90+ minutes
75-90 g/hr
07
Experienced athletes, hard or long efforts
105-120+ g/hr
08
Race day: max out what you've trained
Max g/hr
How It Works

Three inputs. One fueling sheet.

01

Set your workout

Duration, intensity zone, and whether it's training or race day. FuelSheet maps you to the right guideline automatically.

02

Pick your fuel

Select your gels, drink mix, and other products. FuelSheet knows the carb content of every major brand and calculates the exact quantities.

03

Get your sheet

A minute-by-minute fueling timeline. What to take, when to take it, running carb totals. Print it, tape it to your bottle, hand it to your crew.

Two Ways to Fuel

Free calculator. Pro sheets.

Free
$0
  • Full elite fueling methodology
  • All 8 guidelines with zone-based targeting
  • Gel brand database with carb content
  • Instant fueling timeline for any workout
  • Drink mix integration
Pro
$5 /month
  • Everything in Free
  • Save unlimited fueling plans
  • Race-specific profiles (Boston, Western States, your local 50K)
  • Printable PDF fueling sheets for race day
  • Progression tracking as your gut adapts

What you thought was an endurance limitation was just a fueling limitation.

Course records are falling everywhere — ultramarathons, Ironman, world championships. The variable connecting every breakthrough? High-carb fueling done right. FuelSheet puts the science the pros use in your pocket.

Try the Calculator →