OxalateGuard
OxalateGuardTry Free

Fluid Balance: Hydration That Knows What You Ate

The only hydration tracker that adjusts based on your actual oxalate intake — because 2.5 liters isn't enough if you just ate spinach.

Start Tracking FreeSee How It Works

Why Generic Hydration Targets Miss the Mark

Every kidney stone prevention guide says "drink 2.5 liters a day." But your actual hydration need depends on what you ate, what you drank, and your body. One number doesn't fit everyone.

Oxalate Demands More Water

A high-oxalate meal means your kidneys need extra fluid to keep urine dilute. A static 2.5L target ignores this completely.

Not All Drinks Are Equal

Black tea adds oxalate while hydrating. Lemon water adds citrate (protective). Coffee is neutral. Your tracker should know the difference.

Conditions Change Everything

CKD patients may have fluid restrictions. Bariatric patients absorb differently. One-size-fits-all fails these groups.

How Fluid Balance Works

1

Personalized Baseline

Your weight, conditions, and climate set a personalized starting target. Not a generic 2.5L.

2

Dynamic Adjustment

As you log food from 2,500+ foods, your fluid target adjusts. High-oxalate meal? Target goes up automatically.

3

Beverage Intelligence

Log what you drink. We track 9 beverage types — accounting for hydration, oxalate load, and citrate content.

Every Drink Has a Profile

Fluid Balance doesn't just count ounces. It knows the difference between beverages that help and beverages that add risk.

Water

Neutral

Pure hydration

Black Tea

Mixed

Hydrates + adds oxalate

Lemon Water

Protective

Hydrates + adds citrate

Green Tea

Mixed

Hydrates + moderate oxalate

Coffee

Neutral

Hydrates, minimal oxalate

Juice

Moderate

Hydrates but high sugar

The Science of Hydration + Oxalate

Learn why the correlation between oxalate intake and hydration demand is the most under-tracked factor in kidney stone prevention.

Read the full research behind Fluid Balance
6
Conditions Supported
9
Beverage Types Tracked
2,500+
Foods in Database
Free
To Start

More Ways to Stay Safe

Barcode Scanner
Scan any product at the grocery store for instant oxalate info.
Menu Check
Snap a restaurant menu photo and get dish-by-dish analysis.
Food Database
Browse 2,549 foods with multi-source consensus data.
Recipe Converter
Paste any recipe and see the total oxalate breakdown.
Restaurant Guide
Pre-analyzed menus for 100+ chain restaurants.
Community Scout
Help build the world's best oxalate database.
Renal Diet Tracker
Track sodium, potassium, phosphorus & oxalate with condition-aware limits.
Community Hub
Join our community and earn badges while helping others.
Why OxalateGuard
See how we compare to MyFitnessPal, Cronometer, and other apps.
Calcium Shield
Smart calcium pairing for every high-oxalate meal.
Hydration Check
2-second urine color self-assessment with the validated Armstrong scale.
Stone Season Alerts
Weather-aware hydration targets for peak kidney stone months.
Care Team Report
Clinician-grade reports with compliance rates and trend analysis.

Frequently Asked Questions

How does Fluid Balance differ from a regular water tracker?
Regular water trackers give you a static daily goal. Fluid Balance dynamically adjusts based on what you ate — if you logged a high-oxalate meal, your fluid target increases because your kidneys need more water to dilute oxalate in urine. It also accounts for beverage type, weather, and your health condition.
Why does my target change after logging food?
When you log a high-oxalate food, your body needs more fluid to dilute the oxalate before it reaches your kidneys. Fluid Balance increases your target proportionally. This hydration-oxalate correlation is the key differentiator — no other hydration app does this.
Does tea count toward hydration or add oxalate?
Both. Black and green tea contribute fluid but also add significant oxalate. Fluid Balance tracks both the hydration benefit and the oxalate load of each beverage. Herbal teas, lemon water, and plain water contribute hydration without adding oxalate.
What about CKD patients who have fluid restrictions?
Fluid Balance is condition-aware. CKD patients with fluid restrictions will see appropriate warnings and capped targets. The app respects your nephrologist's limits while still showing the relationship between oxalate intake and optimal hydration within those constraints.
How is the personalized goal calculated?
Your baseline starts with a weight-based formula (approximately 30-35mL per kg of body weight). This adjusts upward based on oxalate intake, temperature and weather conditions, exercise, and your specific health conditions. Bariatric patients, for example, have different absorption patterns that affect the calculation.
What beverages does it track?
Fluid Balance tracks 9 beverage categories: water, black tea, green tea, herbal tea, coffee, juice, lemon water, milk, and sports drinks. Each category has a different profile for hydration contribution, oxalate load, and citrate content.

Hydrate smarter. Protect your kidneys.

Start Tracking Free