Estimates a daily fluid planning range from body weight plus simple bumps for activity and heat. It counts all fluids toward the total unless your clinician gave you a restriction—many people meet part of this through food. Kidney disease, heart failure, pregnancy, breastfeeding, or fluid limits mean you should follow medical guidance instead of online estimates.
Baseline ≈ 35 ml × body weight (kg) per day (widely used rough guideline). Total sums baseline + activity + exercise + heat adjustments, then shows ±10% as an individuality band.
Counts beverages generally—not “plain water only.” Ignore or adjust per clinician advice if you have fluid restrictions.
This daily water intake estimator applies the formulas described on this page to the values you enter. Outputs are not financial, tax, legal, or medical advice.
Last reviewed: 2026-04-17
For most healthy adults, caffeinated beverages still contribute to fluids. If your clinician wants you counting only certain fluids, follow that instruction instead.
Follow your medical team’s restriction. This calculator is not for clinically prescribed fluid ceilings.
Needs swing with sweat, diet moisture, and individual thirst response; the band reflects that uncertainty—not precision.