Free lime application calculator. Find how much agricultural lime to apply to raise soil pH and boost yields by soil type and lime quality (CCE%).
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Soil pH affects nutrient availability, microbial activity, and crop performance. Our lime application calculator helps farmers and gardeners determine exactly how much agricultural lime to apply based on current pH, target pH, soil type, and lime quality. Get accurate recommendations in tons per acre or pounds per acre for your specific conditions.
This calculator uses the standard university-extension lime-requirement method: multiply your soil's buffer factor (tons of pure carbonate per acre per pH unit, set by texture) by the pH change you need, then divide by the lime's Calcium Carbonate Equivalent (CCE — the AAPFCO purity rating) to get the product rate. Finer-textured and high-organic soils resist pH change and need more lime than sands for the same target pH.
Lime Requirement Formula
Calculate lime needs when converting new land to cropland or establishing pastures and hayfields.
Adjust pH for different crop requirements, especially when rotating from acid-tolerant to pH-sensitive crops.
Improve legume establishment and nitrogen fixation by raising pH to 6.5-7.0 for alfalfa and clover.
Calculate exact lime amounts for vegetable gardens, fruit trees, and ornamental plantings.
Most nutrients are optimally available at pH 6.0-7.0. Acidic soils lock up phosphorus, calcium, magnesium, and molybdenum.
Proper pH increases fertilizer efficiency, root development, and crop yields by 10-30% in acidic soils.
Beneficial soil bacteria and nitrogen-fixing organisms thrive in near-neutral pH, improving soil health.
Liming reduces toxic aluminum and manganese levels that harm plant roots in acidic conditions.
Calcium Carbonate Equivalent (CCE%) measures the neutralizing power of lime relative to pure calcium carbonate (100%). If your lime has 85% CCE, you'll need to apply more than if using 100% CCE lime. Agricultural lime typically ranges from 85-95% CCE, while dolomitic lime can exceed 100% CCE.
Lime requires 3-6 months to significantly affect pH. For best results, apply lime 6 months before planting (fall application for spring planting). Finely ground lime reacts faster than coarse lime. pH changes continue for up to 2 years after application.
Yes, over-liming can raise pH too high (>7.5), causing micronutrient deficiencies (iron, manganese, zinc, copper). Always soil test before liming and retest after 6-12 months. It's easier to add more lime than to lower pH.
Choose based on magnesium needs. Soil tests showing low magnesium? Use dolomitic lime (contains calcium and magnesium). Adequate magnesium? Use calcitic lime (calcium only). Dolomitic lime has higher CCE% but may react more slowly in some soils.