pH ↔ H⁺ Calculator
Convert between pH and hydrogen ion concentration
Common pH Values
Battery acid1.0
Lemon juice2.0
Vinegar2.5
Coffee5.0
Pure water7.0
Baking soda9.5
Bleach12.5
Drain cleaner14.0
Quick Facts
- •pH 7 = neutral
- •Each pH unit = 10× difference
- •Blood pH: 7.35-7.45 (slightly basic)
- •Stomach acid pH: 1.5-3.5
The pH Scale
pH measures how acidic or basic a solution is, on a scale from 0 to 14. pH 7 is neutral (pure water). Each unit represents a 10× change in hydrogen ion concentration — pH 3 is 10,000 times more acidic than pH 7. The formula is: pH = −log₁₀[H⁺].
Frequently Asked Questions
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This calculator is for educational and reference purposes only. Always verify critical calculations independently.