CAPS Buffer Preparation Calculator
Calculate the conjugate-acid and conjugate-base concentrations to mix a CAPS buffer at your target pH and total molarity — with the working shown.
- 1Required base:acid ratio = 10^(pH−pKa)
10^(10.4−10.4) = 1.000 - 2Split total concentration
[acid] = 0.05000 M, [base] = 0.05000 M
🔒 100% client-side — your data is computed in the browser and never uploaded.
Cite this tool
ToolJolt. CAPS Buffer Preparation Calculator. ToolJolt Chemistry & Lab Tools; 2026. https://tooljolt.comNeed a fast, reliable caps buffer preparation calculator? This free tool computes the answer the moment the page loads and updates live as you type — no sign-up, no installs.
About CAPS Buffer Preparation Calculator
Calculate the conjugate-acid and conjugate-base concentrations to mix a CAPS buffer at your target pH and total molarity — with the working shown. The calculation uses pH = pKa + log([A⁻]/[HA]). Why it matters: 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. Before you trust the number, double-check: picking a buffer whose pKa is far from the working pH; ignoring the temperature dependence of Tris; adjusting pH at the wrong temperature. Everything is computed on your own device — nothing you enter is uploaded — so the tool is safe for unpublished sequences, proprietary formulations and sensitive measurements, and easy to cite in a methods section or lab SOP.
How to use CAPS Buffer Preparation Calculator
- 1Enter your values: Target pH, Total buffer concentration.
- 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 CAPS Buffer Preparation Calculator?
- ✓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
- ✓Copy-ready result and a one-line “cite this tool” snippet for your methods section
- ✓Designed for biochemists, molecular biologists and analytical chemists who need a trustworthy answer fast
- ✓Instant, client-side result — works offline once loaded and keeps your data private
Frequently asked questions
Is this caps buffer preparation calculator 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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