pH Calculator

Calculate pH and pOH from hydrogen or hydroxide ion concentration for aqueous solutions.

InputsChange a value to recalculate instantly

Hydrogen ion concentration [H⁺]

ResultUpdates as you type

pH6

pOH8

[H⁺]0

How it worksTransparent math

FormulapH=−log₁₀[H⁺]; pOH=14−pH

For an aqueous solution near 25°C, pH is the negative base-10 logarithm of hydrogen-ion concentration.

Result breakdownSee the important numbers together

1pH6

2pOH8

3[H⁺]0

λ DooMathWork with this calculation

Local · deterministic · optional

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Quick mathNatural-language-style shortcuts for deterministic arithmetic.

Calculator guide

How to use the pH Calculator

Calculate pH and pOH from hydrogen or hydroxide ion concentration for aqueous solutions.

01Set inputsChoose values, units and assumptions.

02Apply the modelpH = −log₁₀[H⁺]; pOH = 14 − pH

03Read the resultCheck the output against the assumptions before using it.

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Calculate pH and pOH from hydrogen or hydroxide ion concentration for aqueous solutions.

functions

pH = −log₁₀[H⁺]; pOH = 14 − pH

fact_check

Review the inputs, units and assumptions before using the result for a real decision.