Phosphate Binder Dosing Calculator

This calculator estimates a daily phosphate binder tablet count using a simplified mass-balance model, not a formula from a specific published clinical guideline or a validated dosing algorithm -- real-world phosphate binder prescribing is titrated empirically against serial serum phosphorus levels, not calculated directly from estimated dietary intake. The model assumes roughly 65% of dietary phosphorus is absorbed (a rough average -- phosphorus from food additives in processed foods is nearly fully absorbed, while phosphorus from whole foods is absorbed less completely, so this single rate does not capture diet composition), subtracts an estimate of phosphorus removed by dialysis, and scales the remainder upward when current serum phosphorus exceeds the KDIGO-referenced target range of roughly 3.5-5.5 mg/dL for dialysis patients.

Binding capacity per tablet is an approximate, product-formulation-dependent figure that varies by manufacturer and specific product, shown here for four representative binder types: calcium carbonate and calcium acetate (which also contribute elemental calcium, tracked separately since KDIGO-referenced guidance suggests keeping total elemental calcium from binders under about 1500 mg/day to limit vascular calcification risk), and sevelamer and lanthanum (calcium-free alternatives). Because the tablet count scales linearly with entered dietary phosphorus, an unrealistically high dietary intake will produce an unrealistically high tablet count that would not reflect how binders are actually prescribed in practice -- use this as a rough starting-point estimate for counseling, not a substitute for individualized titration by a nephrology or renal dietitian team.