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Buffer pH Calculator
pH of a buffer from pKa and the acid and conjugate base concentrations (Henderson-Hasselbalch).
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Buffer pH
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pH of a buffer from pKa and the acid and conjugate base concentrations (Henderson-Hasselbalch).
Buffer pH Estimator
Enter your numbers below for an instant estimate.
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💡 Tip: pH = pKa + log10([A-] / [HA]).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Buffer Quick Guide
Typical values for reference.
| pKa | Acid M | Base M | pH |
|---|---|---|---|
| 4.76 | 0.1 | 0.01 | 3.760 |
| 4.76 | 0.1 | 0.05 | 4.459 |
| 4.76 | 0.1 | 0.1 | 4.760 |
| 4.76 | 0.1 | 0.5 | 5.459 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Buffer pH Calculator FAQ
Answers to common questions about this calculator.
A solution that resists pH change.
The equation relating pH, pKa and the base to acid ratio.
pH = pKa + log10([A-] / [HA]).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.