⛽ Fuel Calculator
Calculate your carb, fluid & sodium targets based on body weight, conditions, and effort level.
🏃 Event Details
Duration (hours)
Duration (minutes)
Heart Rate Zone
Zone 1 (50-60%) — Easy
Zone 2 (60-70%) — Aerobic
Zone 3 (70-80%) — Tempo
Zone 4 (80-90%) — Threshold
Zone 5 (90-100%) — VO2 Max
GI Training Level
Not Trained
Moderate
Well Trained
High Carb Machine
📋 Body & Conditions
Body Weight
Measurement System
Metric (kg, °C)
Imperial (lbs, °F)
Temperature
Humidity (%)
Sweat Rate Category
Auto (from conditions)
Low Sweater
Low-Medium
Medium-High
High Sweater
Salt Loss Category
Default
Low Salt Loss
Low-Medium
Medium-High
High Salt Loss
⚙️ Fuel Format
Primary Fuel Format
🧴 Energy Gels
🍪 Chews / Bars
🥤 Sports Drink
🔀 Mixed (Gel + Drink)
Preferred Interval
15 min
20 min
25 min
30 min
🔧 Options
Drink Mix Mode
Standard (as-packaged)
Flexible (custom mix)
Caffeine Strategy
None
Auto (pre-load + swap)
Extra Sodium
None
Auto (supplement gap)
Bicarb Protocol
None
Auto (detect from product)
Homemade Energy Gel
Homemade Sports Drink
📦 Products
Selected Gel
Energy Gel (default)
Selected Drink
Sports Drink (default)
Selected Chews
Energy Chews (default)
Bicarb Product
Select...
Sodium Supplement
Select...
⚡ Calculate Fueling Plan
📊 Your Fueling Targets
Carbs / hr
—
grams
Fluid / hr
—
ml
Sodium / hr
—
mg
Total Carbs Needed
—
Est. Sweat Rate
—
📋 Fueling Timeline