Human Body OS
Tool · Free Forever
Beyond ounces. Get baseline fluid needs, sweat-loss compensation, and exact sodium & potassium replenishment targets calibrated to climate and training load.
Body weight
75 kg
Climate temp
22 °C
Workout today
45 min
Daily fluid target
≈ 107 fl oz · 13 × 250ml glasses
Baseline hydration
2625 ml
35 ml × bodyweight
Heat compensation
0 ml
Climate-driven loss
Sweat loss
540 ml
From training volume
Sodium target
1986 mg
Plasma volume & nerve signaling
Potassium target
2708 mg
Cellular hydration & cramp prevention
Drinking water without sodium can dilute plasma volume and trigger reflexive urination — you pee out what you just drank. Pair every additional liter beyond baseline with ~500–900 mg sodium and a banana or potato's worth of potassium to keep fluid inside the cells where it counts.
SomaOS handles structural biometric modelling — outputs are estimates, not medical diagnostics.