Buffer Capacity Calculator — Van Slyke Equation & Buffer Design
Calculate buffer capacity (β) using the Van Slyke equation. Find how much acid or base your buffer can neutralize before pH changes. Includes selection guide.
✓ Formula verified: May 2026
Buffer Capacity
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Buffer Capacity (β)
0.05758 mol/L·pH
Buffering Effectiveness
▲ Excellent — pH within ±0.5 of pKa, maximum buffering
Acid/Base Distribution
50.0% acid (HA) / 50.0% base (A⁻)
Formula Used
β = 2.303 × C × Ka[H⁺] / (Ka + [H⁺])²
What if your acid dissociation constant (pka) changes? 4.284 → 0.04324 mol/L·pH · 4.76 → 0.05758 mol/L·pH · 5.236 → 0.04324 mol/L·pH
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