Hydration Tracker Calculator Formula

Understand the math behind the hydration tracker calculator. Each variable explained with a worked example.

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Formulas Used

Daily Hydration Goal

daily_goal = round((base_oz + exercise_extra) * climate)

Remaining to Drink

remaining = max(round((base_oz + exercise_extra) * climate) - water_consumed_oz, 0)

Hydration Progress

pct_complete = min(water_consumed_oz / ((base_oz + exercise_extra) * climate) * 100, 100)

Variables

VariableDescriptionDefault
weight_lbsBody Weight(lbs)170
exercise_minutesExercise Duration Today(minutes)30
climateClimate / Temperature1
water_consumed_ozWater Consumed So Far(oz)40
base_ozDerived value= weight_lbs / 2calculated
exercise_extraDerived value= exercise_minutes / 30 * 12calculated

How It Works

Hydration Goal Calculation

Daily Goal (oz) = (Weight/2 + Exercise Bonus) x Climate Factor

Exercise Bonus

Add 12 oz for every 30 minutes of exercise to replace sweat losses.

Climate Adjustment

| Climate | Factor | |---|---| | Cool | 0.9x | | Moderate | 1.0x | | Hot/humid | 1.2x |

Worked Example

A 170 lb person, 30 min exercise, moderate climate, 40 oz consumed.

weight_lbs = 170exercise_minutes = 30climate = 1water_consumed_oz = 40
  1. 01Base = 170 / 2 = 85 oz
  2. 02Exercise bonus = 30/30 x 12 = 12 oz
  3. 03Goal = (85 + 12) x 1.0 = 97 oz
  4. 04Remaining = 97 - 40 = 57 oz

Ready to run the numbers?

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