CalculatorCritical
Ocean Acidification Calculator
For researchers, ngos & environmental professionals. Result, assumptions, chart, comparisons and recommendations.
Unit system— all inputs and outputs convert automatically
Inputs
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Estimated surface ocean pH
7.94
pH
High acidificationNotes
- • A 0.1 pH drop = ~26% more H⁺ ions. Corals & shellfish struggle below pH 7.9.
Breakdown chart
Visual comparison of each component (pH units).
- Drop vs pre-industrial (8.20)
- 0.26 pH units
- Increase in H⁺ ion concentration
- 82.00 %
Methodology & sources
Formula
Approx pH = 8.20 − 0.0018 · (CO₂ − 280) (empirical fit, Caldeira & Wickett 2003)Sources
- • Caldeira & Wickett (Nature 2003)
- • IPCC AR6 WGI Chapter 5