pH Buffer Recipe Calculator
Get weighed buffer recipes with temperature-corrected pH, ionic strength, stock dilution, and copy-ready protocols.
What it does
Choose a buffer system (Tris, phosphate, HEPES, and others), then enter target pH, concentration, final volume, and separate preparation and working temperatures. Results update as you type: grams of acid and base forms, ionic strength, predicted pH at use temperature, and step-by-step gravimetric or titration instructions.
Optionally set a target ionic strength to add NaCl, or switch to stock mode to calculate how much concentrate to pipette and whether to re-check pH after dilution. Compatibility notes flag common assay conflicts (for example phosphate with enzyme assays). Copy the full protocol, a Methods-style sentence, or a shareable link—no retyping into your notebook.
Why researchers use it
- See actual working pH when prep and use temps differ
- Match ionic strength across buffers with optional NaCl
- Catch enzyme and metal conflicts before you mix
- Get gravimetric and titration prep routes together
- Share exact recipes via link with colleagues
Best for
- Tris and HEPES buffers for protein work
- Phosphate buffers for biochemistry and assays
- Cold-room use after room-temperature preparation
- Diluting concentrated buffer stocks to working strength
- Writing reproducible Methods sections
- Matching ionic strength between experimental conditions
What makes it different
Free calculators such as molbiotools give quick answers but ignore preparation versus working temperature and ionic strength, so Tris made at room temperature and used on ice can miss target pH. Liverpool BufferCalc is accurate but dated, desktop-oriented, and lacks stock dilution or inline biological warnings.
This browser tool combines separate prep and working temperatures, live ionic strength with optional salt adjustment, stock dilution with a re-check reminder, gravimetric and titration routes, compatibility flags, and copy-ready protocol export—no install or account.