How to use this calculator
- Select the calculation mode matching your sample or workflow.
- Enter values with the units requested beside each field.
- Review custom ranges, efficiencies, molecular weights, and assumptions.
- Press the calculate button to display results above the form.
- Copy, export, print, or save the result when needed.
Included formulas
The converter moves concentrations through molar units. It supports phosphorus and phosphate mass bases. Dilute water ppm is treated as mg/L.
Urine excretion multiplies concentration by collected volume. Daily output adjusts for collection duration. Renal mode calculates FEPO₄ and TRP.
Aquarium dosing uses target concentration and system volume. Removal estimates use media capacity and efficiency. Water changes apply a perfect-mixing balance.
Soil calculations use area, depth, and bulk density. The phosphorus deficit becomes a nutrient mass. P converts to P₂O₅ using 2.2914.
Laboratory modes use molecular weight and solution volume. Stock preparation accounts for phosphate groups and purity. Buffer mode estimates four acid-base species.
Important limitations
Clinical results require professional interpretation. Aquarium products require manufacturer-specific dosing checks. Agricultural applications require local soil-test recommendations.
Hydrates change compound molecular weights. Temperature changes phosphate buffer behavior. Real systems may not follow ideal mixing assumptions.
Saved calculation history
History is stored only in this browser using local storage.
| Date | Mode | Summary | Action |
|---|