Lawn Care
Lime Rate Chart: Pounds of Lime to Raise Soil pH
Quick answer
To raise soil one full pH unit, from 5.5 to 6.5, plan about 40 pounds of ground limestone per 1,000 square feet on sandy soil, 70 pounds on loam and 100 pounds on clay. Apply no more than about 50 pounds per 1,000 square feet at once.
Lime raises soil pH, and most lawn grasses take up nutrients best between about pH 6.0 and 7.0. How much lime that takes depends on how far the pH must move and on soil texture, because clay and high organic matter soils resist change and need more.
Treat every figure below as a planning estimate. Two soils with the same pH can need very different amounts of lime, and only a lab soil test with a buffer pH reading measures that difference. The lime calculator runs these rates against your area and bag size.
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How much lime do I need per 1,000 square feet?
| Starting pH | Sandy soil | Loam | Clay or high organic matter | Loam over 5,000 sq ft |
|---|---|---|---|---|
| pH 6.0 to 6.5 | 20 lb | 35 lb | 50 lb | 175 lb |
| pH 5.5 to 6.5 | 40 lb | 70 lb | 100 lb | 350 lb |
| pH 5.0 to 6.5 | 60 lb | 105 lb | 150 lb | 525 lb |
| pH 4.5 to 6.5 | 80 lb | 140 lb | 200 lb | 700 lb |
Based on roughly 4, 7 and 10 pounds per 1,000 sq ft per tenth of a pH unit for sandy, loam and clay soils. Split any total above about 50 lb per 1,000 sq ft into separate applications several months apart.
What soil pH does each grass type prefer?
| Grass | Preferred pH | Notes |
|---|---|---|
| Kentucky bluegrass | 6.0 to 7.0 | Responds well to correcting acidic soil |
| Tall fescue | 5.5 to 7.0 | Tolerates a wider range than most |
| Perennial ryegrass | 6.0 to 7.0 | Similar to bluegrass |
| Fine fescue | 5.5 to 6.5 | Handles mildly acidic soil well |
| Bermudagrass | 6.0 to 7.0 | Standard range |
| Zoysiagrass | 6.0 to 7.0 | Standard range |
| St. Augustinegrass | 6.0 to 7.5 | Tolerates slightly alkaline soil |
| Bahiagrass | 5.5 to 6.5 | Prefers the acidic end |
| Centipedegrass | 5.0 to 6.0 | Do not lime above 6.0; iron deficiency follows |
Approximate ranges from university extension guidance. Many lawns in dry western regions are already alkaline and should never be limed.
What is the difference between pelletized, dolomitic and calcitic lime?
| Product | What it is | Raises pH? | Use it when |
|---|---|---|---|
| Pelletized limestone | Finely ground limestone bound into pellets | Yes | You want clean spreading through a broadcast spreader |
| Dolomitic lime | Calcium and magnesium carbonate | Yes | A soil test shows magnesium is low |
| Calcitic lime | Mostly calcium carbonate | Yes | Magnesium is already adequate or high |
| Powdered agricultural lime | Unpelletized ground limestone | Yes, fastest reaction | Large areas where dust and spreading are not a problem |
| Gypsum | Calcium sulfate | No | You want calcium without changing pH |
| Soluble calcium products | Low-rate calcium formulations | Varies, follow the label | The label rate applies, not this chart |
Applied at the same weight, pelletized lime corrects pH like the ground limestone it is made from. Do not use this chart for low-rate soluble products.
How is the lime rate calculated?
The rate is pounds per 1,000 sq ft = (target pH minus current pH) x 10 x a texture factor, where the factor is about 4 pounds per tenth of a unit on sandy soil, 7 on loam and 10 on clay. Those factors reflect the common extension tables that list roughly 40, 70 and 100 pounds to raise sandy, loam and clay soils one full unit.
The calculator then caps each application at 50 pounds per 1,000 square feet and tells you how many applications to split the total into. A 5,000 square foot loam lawn going from 5.5 to 6.5 needs about 350 pounds, which is seven 50 pound bags and two separate applications several months apart. Home capsule kits such as the Luster Leaf Rapitest are fine for checking pH but cannot give you a lime rate, because they do not measure buffer pH.
When is the best time to apply lime to a lawn?
Any time the ground is not frozen, but fall and early spring are the most practical. Fall applications get winter freeze and thaw cycles to help work lime into the soil, so the change is underway by the growing season. Lime reacts slowly: most of the movement happens over several months to a year, so do not retest for at least several months.
Spread it in two perpendicular passes with a broadcast spreader, and check your spreader manual, because not every model is rated for lime. Core aerating first, with a tool such as the Yard Butler ID-6C or a tow-behind Brinly plug aerator, helps lime reach the root zone faster. See how to test soil pH and how to aerate a lawn.
Which lime, tests and spreaders should I use?
Test first, then lime. A mail-in lab test is the only way to get a real rate rather than an estimate. Spreader picks are in the best lawn spreaders.
MySoil Soil Test Kit
$34.26A mail-in lab test that reports pH and nutrient levels, which is what turns the estimate in this chart into a real application rate.
Best for: anyone about to lime a whole lawn
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Old Castle Pro Pelleted Dolomitic Limestone, 50 lb
$47.99Pelletized dolomitic limestone in a 50 pound bag, which is one application for 1,000 square feet of clay soil at the maximum single rate.
Best for: acidic soils that also test low in magnesium
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Jonathan Green Mag-I-Cal Soil Food for Acidic Soil, 15,000 sq ft
$61.20A soluble calcium product for acidic soils, applied at its own much lower label rate rather than the rates in this chart.
Best for: lawns needing a quicker calcium correction
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The Andersons NutraSoft OP Pelletized Gypsum, 40 lb
$28.45Pelletized gypsum adds calcium but does not raise pH, which is the right choice when calcium is low and pH is already fine.
Best for: soils that need calcium, not liming
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EarthWay 2150 Commercial 50 lb Broadcast Spreader
$279.99A commercial 50 pound broadcast spreader with large wheels that handles the weight and flow of pelletized lime across rough ground.
Best for: large lawns and heavy applications
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Luster Leaf Rapitest Soil Test Kit, 40 Tests
$18.68Forty capsule tests for spot checking pH across a lawn, useful for finding variation but not for setting a lime rate.
Best for: quick checks between lab tests
Check price on AmazonHow we chose
We did not test these products in person. Picks are researched from manufacturer specifications and owner manuals, engine and safety certifications where they apply, warranty terms, public recall records, and the recurring themes in verified owner reviews. We favor established brands with large review counts and parts support, match each pick to a real yard size or task, and place it in the tier where its price and capability actually belong.
Frequently asked questions
How much lime do I need for 5,000 square feet?
To raise a loam soil from pH 5.5 to 6.5, plan about 70 pounds per 1,000 square feet, or roughly 350 pounds for 5,000 square feet, which is seven 50 pound bags. Because that exceeds about 50 pounds per 1,000 square feet, split it into two applications several months apart. Sandy soil needs about 200 pounds and clay about 500.
Can you put too much lime on a lawn?
Yes. Overliming pushes pH above the range grass prefers, which ties up iron, manganese and phosphorus and can yellow the lawn. High pH is much slower and harder to lower than low pH is to raise. That is why lime should follow a soil test, be applied at no more than about 50 pounds per 1,000 square feet at a time, and be retested before adding more.
How long does lime take to change soil pH?
Lime reacts slowly. Most of the change happens over several months to a year, and finely ground or pelletized limestone reacts faster than coarse material. Watering after application and core aerating beforehand both help it reach the root zone. Wait at least several months, ideally a year, before retesting and deciding whether another application is needed.
Should I use pelletized or powdered lime?
Pelletized lime is the practical homeowner choice because it spreads evenly through a standard broadcast spreader with far less dust. It is made from finely ground limestone, so at the same weight it corrects pH similarly. Powdered agricultural lime can cost less per pound over large areas but is dusty and hard to spread evenly without specialized equipment.
Does my lawn actually need lime?
Only if a soil test shows acidic soil below the range your grass prefers, usually under about pH 6.0 for most lawn grasses. Moss and a poor response to fertilizer can hint at acidity but have other causes. Many lawns in dry western regions are naturally alkaline and would be harmed by liming, so test before buying a single bag.
Researched, not professional advice. This page is compiled from published specifications, manuals, labels and owner-review consensus, not hands-on testing. Follow the manufacturer's instructions and product label, and consult a qualified professional where safety, chemicals, fuel or structures are involved. As an Amazon Associate we earn from qualifying purchases.