Create custom sports drink recipes with precise electrolyte ratios, carbohydrate blends, and hydration targets for any activity level.
Commercial sports drinks are convenient, but a custom mix lets you tune carbohydrate strength, sodium level, and flavor to the session in front of you.
For longer training, the usual goal is to replace fluid, sodium, and carbohydrate in a form you can tolerate while exercising. That is why drink strength matters: too weak and you underfuel, too strong and absorption can feel sluggish or upsetting.
This calculator helps you build a recipe from duration, intensity, sweat rate, and preferred ingredients. It estimates ingredient amounts and cost so you can compare a training bottle, race bottle, or lighter hydration mix without guessing at the ratios.
A custom mix is useful when sweat rate, weather, or session length make a standard bottle too weak, too sweet, or too salty. This calculator keeps the recipe anchored to the activity instead of forcing one drink profile for every workout.
Carb concentration (%) = carb grams / fluid mL × 100. Target: 6-8% for exercise, 2-4% for light activity. Sodium: 500-700 mg/L standard, 700-1000 mg/L heavy sweaters. Osmolality target: 200-300 mOsm/kg (hypotonic to isotonic). Sugar (4 cal/g), table salt = 39% sodium.
Result: Recipe: 40g sugar, 20g honey, 1/2 tsp salt, 2 tbsp lemon juice in 1L water
For 90 minutes of moderate exercise, a 1-liter bottle with 60g carbs (~6% solution) and 600mg sodium provides optimal hydration and energy replacement. Total cost: approximately $0.30 per liter.
The three key components of a sports drink are water, carbohydrates, and electrolytes (primarily sodium). Water provides the fluid volume. Carbohydrates maintain blood glucose and fuel muscles—they also speed gastric emptying when at 6-8% concentration. Sodium drives fluid absorption through the sodium-glucose cotransport mechanism in the intestines, meaning the combination of sodium and glucose together promotes fluid uptake better than either alone.
Table sugar (sucrose) splits into glucose and fructose during digestion, making it a natural dual-transport source. Honey is similar but also contains small amounts of minerals. Maltodextrin is a glucose polymer that provides high carbohydrate density with low sweetness and osmolality, making it ideal for concentrated drinks. Maple syrup adds glucose, fructose, and trace minerals. For maximum absorption during intense exercise, a 2:1 ratio of maltodextrin to fructose is considered optimal.
Sweat rates range from 0.5 L/hour (light exercise, cool weather) to 2.5 L/hour (intense exercise, hot weather). Sweat sodium concentration ranges from 200-2000 mg/L depending on genetics and heat acclimatization. To estimate your sweat rate, weigh yourself before and after a 1-hour workout (nude, toweled dry). Each pound lost equals approximately 16 oz of sweat. Salty crust on clothing or skin indicates high sodium losses, suggesting you need a higher-sodium drink.
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This worksheet combines water, carbohydrate, and sodium assumptions into a custom formulation estimate for DIY Sports Drink Calculator. It is meant to help compare recipes and planning targets, not to replace gut training or individualized nutrition advice.
Yes—and potentially more effective. Commercial drinks like Gatorade contain about 6% carbohydrate and 450-500 mg sodium/L. A DIY drink can match or optimize these levels for your individual needs, especially sodium for heavy sweaters.
For exercise over 60 minutes, 6-8% carbohydrate (60-80g per liter) is optimal. Lower concentrations (2-4%) work for shorter or less intense activities. Exceeding 8% can cause GI distress and slow fluid absorption.
Sodium promotes fluid absorption in the intestines, helps maintain blood volume, prevents hyponatremia (dangerously low blood sodium), and stimulates thirst. Heavy sweaters can lose 1000-2000 mg sodium per hour.
Yes! Honey provides a mix of glucose and fructose which can improve absorption (dual transport). Use slightly more honey than sugar by weight since honey is only about 80% carbohydrate.
For exercise under 60 minutes at moderate intensity, water is sufficient. For longer or high-intensity sessions, sports drinks provide meaningful performance and recovery benefits.
Refrigerated, a homemade sports drink lasts 3-5 days. At room temperature, consume within 24 hours. Adding citrus juice reduces shelf life slightly but adds vitamin C and flavor.