Henderson–Hasselbalch Calculator — CAPS
Find the pH of a CAPS buffer from the molar ratio of conjugate base to acid using the Henderson–Hasselbalch equation.
- 1Ratio of conjugate base to acid
[A⁻]/[HA] = 50/50 = 1.000 - 2Henderson–Hasselbalch
pH = 10.4 + log₁₀(1.000) = 10.40
🔒 100% client-side — your data is computed in the browser and never uploaded.
Cite this tool
ToolJolt. Henderson–Hasselbalch Calculator — CAPS. ToolJolt Chemistry & Lab Tools; 2026. https://tooljolt.comA no-nonsense henderson–hasselbalch calculator — caps built for pH and buffer chemistry. It shows the substituted formula, not just the answer, so you can check the working.
About Henderson–Hasselbalch Calculator — CAPS
Find the pH of a CAPS buffer from the molar ratio of conjugate base to acid using the Henderson–Hasselbalch equation. The calculation uses pH = pKa + log([A⁻]/[HA]). Why this calculation counts: A buffer that drifts even half a pH unit can denature an enzyme, ruin a crystallization, or shift a binding assay. Buffer choice and accurate pH are foundational to reproducible biology. Common pitfalls to avoid: ignoring the temperature dependence of Tris; adjusting pH at the wrong temperature; exceeding the useful buffering range (pKa ± 1). All maths runs locally in your browser; no data is ever sent to a server. That privacy is exactly why researchers link these calculators from protocols, theses and standard operating procedures.
How to use Henderson–Hasselbalch Calculator — CAPS
- 1Enter your values: Conjugate base [A⁻], Acid [HA].
- 2Read the headline result and the supporting figures, which recompute as you type.
- 3Open “Worked example with your numbers” to see the substituted formula step by step.
- 4Copy the result, or use the cite-this-tool snippet for your methods section.
Why use Henderson–Hasselbalch Calculator — CAPS?
- ✓Shows the worked example step by step with your own numbers, not just a final figure
- ✓Pre-filled with sensible, niche-specific defaults so it is useful the second it loads
- ✓Mobile-friendly and completely free, with no sign-up or usage caps
- ✓Built on a sourced, unit-tested formula for pH and buffer chemistry
- ✓Links to related pH and buffer chemistry calculators so you can finish the whole workflow
Frequently asked questions
Is this henderson–hasselbalch calculator — caps free to use?+
Yes. It is completely free, needs no sign-up, and runs entirely in your browser — there are no usage limits.
What formula does it use?+
It uses pH = pKa + log([A⁻]/[HA]) The full worked example is shown beneath the result so you can verify each step.
What are the most common mistakes here?+
In pH and buffer chemistry, watch for: picking a buffer whose pKa is far from the working pH; ignoring the temperature dependence of Tris; adjusting pH at the wrong temperature; exceeding the useful buffering range (pKa ± 1). This tool shows the working so you can catch these before they cost an experiment.
Does my data leave my device?+
No. All computation happens locally in your browser. Nothing you enter — sequences, concentrations or measurements — is uploaded to any server, so it is safe for confidential work.
Can I cite this tool?+
Yes — use the “Cite this tool” snippet on the page. Many users link these calculators from methods sections, lab SOPs and teaching materials.
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