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Free hydration calculator built on a 33 mL/kg baseline (typical wellness range ~30–35 mL/kg), then adjusted for activity, climate, and optional exercise minutes. Output includes liters, milliliters, US fl oz, and 8 oz glasses. Pair with sleep planning and activity energy.
Last updated: April 11, 2026
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Adds ~350 mL per 30 minutes (rough sweat replacement hint).
Approx. total beverages + water-rich foods
3.45 L
~3446 mL · ~117 fl oz (US) · ~14.6 × 8 oz glasses
Base ~2475 mL from weight × 33 mL/kg, scaled by activity (1.18×) and climate (1×), plus ~525 mL from extra exercise time.
Not medical advice. Heart or kidney conditions, medications, and pregnancy change fluid needs—ask your clinician. Thirst, urine color, and weight change are practical checks.
Starting point
33 mL/kg
Converts lb → kg automatically when you choose imperial units.
Levels
5 bands
Roughly captures higher turnover on active work or training days.
Climate bump
Small %
Not a substitute for sport-specific sweat testing.
Rule of thumb
~350 mL / 30 min
Capped so extreme entries stay reasonable.
US customary
fl oz & 8 oz
8 fl oz glass volume uses standard US fluid ounces.
Disclaimer
Not clinical
Medical conditions change fluid prescriptions.
75 kg, moderate activity, mild climate, 45 min extra exercise → about 3.45 L (~3446 mL) total fluids from the model.
We estimate a daily fluid target compatible with common fitness and wellness coaching heuristics: scale with body size, bump for workload and environment, then add a simple exercise increment. Food moisture counts toward similar population targets in national guidance, so treat the number as “all sources,” not chugging jugs of plain water alone unless that is your plan.
Base (mL) = Weight (kg) × 33Subtotal = Base × Activity factor × Climate factorTotal ≈ Subtotal + Exercise add-on (mL)Training hard? See calories burned and TDEE.
Get a Custom Calculator for Your PlatformMultiply base by activity and climate, then add any exercise minutes in the form. The tool rounds and clamps to keep outputs in a sensible band—plug your exact numbers on the left for precision.
Share it with your gym or training group.
Suggested hashtags: #Hydration #Water #Fitness #Wellness #Calculator