Lime Rate Calculator
Enter your current and target soil pH, lime type, and field size to calculate the exact lime application rate needed to correct soil acidity.
Use the Lime Rate Calculator
Soil & pH Settings
From your soil test report (water pH).
Typical crop targets: cereals 6.0–6.5, legumes 6.5–7.0.
SMP buffer pH from soil test. Values at or above 6.90 use the pH-gap estimate.
Lime Product
Field Area
Enter your soil pH values and click Calculate to see the lime recommendation.
Lime Rate
—
tons / acre
Total Quantity
—
tons for field
Calculation Breakdown
pH Correction Overview
From
To
pH 4
pH 6
pH 8
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Summary
Enter your current and target soil pH, lime type, and field size to calculate the exact lime application rate needed to correct soil acidity.
How it works
- Enter your current soil pH and target soil pH from your soil test report.
- Enter an SMP buffer pH if available; values below 6.90 use the supported SMP equation.
- Select your lime type (calcitic, dolomitic, or agricultural limestone) or enter a custom neutralizing value (NV%).
- Choose your preferred units (acres or hectares) and enter the field area.
- Click Calculate to see the adjusted lime application rate and total quantity needed.
Use cases
- Convert a soil test lime recommendation into tons of a specific lime product.
- Compare application rates between calcitic and dolomitic lime products.
- Estimate total lime tonnage and cost before purchasing for a field or paddock.
- Adjust lime rate when using a product with a non-standard neutralizing value.
- Plan split lime applications over multiple seasons for large pH corrections.
- Determine lime need for new ground being brought into crop production.
- Check whether an existing soil test recommendation matches your lime product NV.
- Calculate lime rates for both large farm fields and small garden plots.
Frequently Asked Questions
Last updated: 2026-09-22 ·
Reviewed by Nham Vu