Built for endurance athletes

Stop Bonking.
Start Racing.

FuelForm generates a personalized race nutrition plan for your exact event — carbs, sodium, fluids, and precise timing — in under 3 minutes. Free to start.

Try the Free Calculator Plan Your Race Nutrition

✓ No credit card needed✓ Free forever tier✓ Trusted by 1,200+ athletes✓ Formulas from peer-reviewed research

🚴 Cycling🏃 Running🏊 Triathlon⛰️ Ultra

How it works

3 steps to your
race-day plan.

FuelForm turns your race details and body data into a science-backed fueling schedule — no dietitian, no guesswork, no forum advice.

📋

Step 01

Enter your race details

Sport, distance, duration, sweat rate, and conditions. 90 seconds of inputs — no lab test, no dietitian visit required.

⚡

Step 02

Get your fueling plan

Exact carbs (g/hr), sodium (mg/hr), fluids (ml/hr), and timing — all personalized to your body and event.

🏆

Step 03

Race with confidence

No more guessing mid-race. Follow a science-backed plan and cross the finish line with something left in the tank.

Try the Free Calculator

“

FuelForm helped me nail my nutrition at Ironman 70.3 — no more bonking at mile 40. Finally a tool that actually calculates my sweat rate.

Alex R.

Ironman Finisher

Built on science

Research-
Backed
Formulas.

FuelForm's fueling targets are derived from the same research used by professional sports dietitians — not forum posts, not bro-science.

View full citations

🔬

Carbohydrate Oxidation

Jeukendrup et al.

Multiple transportable carbohydrates enable 90–120 g/hr oxidation rates. Underpins our carb targets by weight and intensity.

💧

Hydration

ACSM Position Stand

Individualized fluid replacement based on sweat rate and environment. Basis for our 400–800 ml/hr fluid guidelines.

🏅

Sports Nutrition

IOC Consensus Statement

International Olympic Committee evidence synthesis on macro and micronutrients for elite sport — our overall framework.

🧂

Sodium & Endurance

Burke et al.

Sodium supplementation reduces hyponatremia risk and maintains plasma osmolality during events longer than 2 hours.

The problem

Your training is dialed.
Your fueling isn't.

Most athletes spend months building fitness — then blow up on race day because of a nutrition plan they copied from a forum.

💥

Bonking at Mile 18

Your glycogen runs out. Your legs stop. Your race becomes a suffer-fest walk to the finish line. Classic mistake: not enough carbs early, too many late.

🤢

GI Meltdown Mid-Race

Too much fiber, the wrong gels, mixing brands that don't play nice — your gut turns on you at kilometer 30. It doesn't have to be this way.

🦵

Cramping on the Run

Low sodium + dehydration = involuntary quad lock-up. You trained through summer heat and forgot sweat replaces more than water.

🎯

Generic Advice That Fits No One

"60g of carbs per hour" sounds science-backed. But it ignores your weight, your sweat rate, your event duration, and your stomach sensitivity.

📊

Studies show that 40–60% of endurance athletes experience significant GI distress in races longer than 4 hours — most of which is preventable with proper fueling strategy. FuelForm is built on the same evidence-base used by pro sports dietitians.

Early adopters

1,200+

Athletes fueling smarter

4,800+

Race plans generated

Countries represented

“First race where I didn't hit the wall. Followed the plan exactly — crossed the line with something left in the tank.”

Mara T.

IRONMAN 70.3 Finisher · Age 38

“I've been racing for 6 years. This is the first time I actually understood *why* I was taking a gel at mile 14 instead of just guessing.”

Kevin R.

Boston Marathon Qualifier · Age 42

“My athletes used to show up to race day with random gel packets. Now they have a plan. My job got a lot easier.”

Coach Dana M.

Triathlon Coach · 12 Athletes on Roster

Join 1,200+ athletes already fueling smarter

Pro Feature Preview

Race Day Fueling.
Hour by Hour.

Here's what a Pro fueling plan looks like for an Ironman 70.3. Every macro, every product, every minute — personalized to your body and race conditions.

Sample Plan · Ironman 70.3

Race Day Fueling Schedule

Athlete

75 kg · Male

Conditions

24°C · Humid

Target Time

4h 45min

Sweat Rate

1.2 L/hr

🌅

T−90 min

Pre-Race

60g

Carbs

400mg

Sodium

500ml

Fluid

Oats + banana + electrolyte drink

🏊

Hour 1

Swim → T1

30g

Carbs

300mg

Sodium

250ml

Fluid

None (race start) — gel at T1

🚴

Hour 2

Bike (km 0–45)

75g

Carbs

650mg

Sodium

600ml

Fluid

Maurten Drink Mix 160 × 1 + Gel 100 × 1

🚴

Hour 3

Bike (km 45–90)

80g

Carbs

750mg

Sodium

650ml

Fluid

Maurten Gel 100 × 2 + SIS Beta Fuel Bar × 1

🏃

Hour 4

T2 → Run (km 0–8)

60g

Carbs

700mg

Sodium

500ml

Fluid

Maurten Gel 160 × 1 + cola at aid station

🏁

Hour 5

Run (km 8–21)

55g

Carbs

650mg

Sodium

450ml

Fluid

Maurten Gel 100 × 1 + electrolyte tabs × 2

Pro Only

+3 More Hours Locked

Complete race-day timeline, product breakdown, and printable PDF export.

Get Your Plan

$12/mo · Cancel anytime

Time	Segment	Carbs (g/h)	Sodium (mg/h)	Fluid (ml/h)	Products
T−90 min	🌅Pre-Race	60g	400mg	500ml	Oats + banana + electrolyte drink
Hour 1	🏊Swim → T1	30g	300mg	250ml	None (race start) — gel at T1
Hour 2	🚴Bike (km 0–45)	75g	650mg	600ml	Maurten Drink Mix 160 × 1 + Gel 100 × 1

Hour 3	🚴Bike (km 45–90)	80g	750mg	650ml	Maurten Gel 100 × 2 + SIS Beta Fuel Bar × 1
Hour 4	🏃T2 → Run (km 0–8)	60g	700mg	500ml	Maurten Gel 160 × 1 + cola at aid station
Hour 5	🏁Run (km 8–21)	55g	650mg	450ml	Maurten Gel 100 × 1 + electrolyte tabs × 2

Pro Only

+3 More Hours Locked

Get your complete race-day timeline, product-by-product breakdown, sweat-loss calculations, and printable PDF export.

Get Your Personalized Plan

$12/mo · Cancel anytime

Race Totals

Total Carbs:360g

Total Sodium:3450mg

Total Fluid:3.0L

* Totals blurred — unlock full plan with Pro

This is a sample. Your plan is calibrated to your body weight, sweat rate, and race conditions.

Unlock My Full Plan — $12/mo

Pricing

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Race fueling calculator

1 complete race nutrition plan

Carb, sodium & fluid targets

Hourly fueling schedule

Starter race-day guidance

Unlimited race plans

Training-adaptive daily targets

Strava / Garmin sync

Smart fueling alerts

Got Questions?

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Your Next PR
Starts Here.

Build your first personalized race nutrition plan in 3 minutes. Free forever. No excuses.

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Join 1,200+ athletes already fueling smarter

Stop Bonking.Start Racing.

3 steps to yourrace-day plan.

Enter your race details

Get your fueling plan

Race with confidence

Research-BackedFormulas.

Your training is dialed.Your fueling isn't.

Bonking at Mile 18

GI Meltdown Mid-Race

Cramping on the Run

Generic Advice That Fits No One

Race Day Fueling.Hour by Hour.

Start Free.Upgrade When You're Ready.

Got Questions?

Your Next PRStarts Here.

Stop Bonking.
Start Racing.

3 steps to your
race-day plan.

Research-
Backed
Formulas.

Your training is dialed.
Your fueling isn't.

Race Day Fueling.
Hour by Hour.

Start Free.
Upgrade When You're Ready.

Your Next PR
Starts Here.