Soil pH Buffer Calculator

Estimate lime required to raise soil pH using a buffer-based approach. Enter your current pH, target pH, a buffer capacity factor (how many lb of CaCO₃ per 1,000 ft² change pH by 0.1), and your product’s effectiveness. Always follow a lab’s recommendation when available.

Results

Results include: Lime per 1,000 ft², Total lime (lb), Bag count (approx.), and a plain‑language note.

Lime per 1,000 ft²

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Total Lime (lb)

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Bags (approx.)

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Note

Useful Tips

Use lab buffer data: This calculator relies on a buffer capacity factor—use your soil test’s value when possible.
Split applications: Large lime totals are best split over seasons and watered in.
Target range: Many lawns and gardens do well around pH 6.2–6.8, but follow crop‑specific guidance.
Lowering pH: Use sulfur/acidifying products; this tool estimates lime for raising pH only.