⚗️ Soil pH Calculator

How Much Lime or Sulfur to Apply

Calculate the exact amendment needed to hit your target pH based on soil texture and lawn size.

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Calculate Your Amendment Rate

Enter your current and target soil pH to find out how much lime or sulfur to apply.

💡 Most lawns thrive at pH 6.0–7.0. If you don't know your current pH, a soil test from your local cooperative extension office is inexpensive and gives precise results.
Amendment Needed
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⚠️ These are estimates based on general guidelines. A professional soil test gives the most accurate recommendation. Retest pH in 3–6 months after applying.
Gear & Tips
What You'll Need
My Soil Test Pick
Start Here
MySoil — Soil Test Kit
“Before you apply lime or sulfur, you need to know your actual pH and nutrient levels. This kit makes it easy.”
  • Mail-in kit with prepaid return mailer — no lab account needed
  • Tests pH plus 13 nutrients including N, P, K, calcium, magnesium & more
  • Results delivered by email with specific amendment recommendations
  • Tells you exactly how much lime or sulfur to apply — and whether you need it at all
  • Retest every 2–3 years to track how your soil is improving
Check Price & Availability →
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My Spreader Pick
Top Pick
ECHO RB-60 Heavy-Duty Broadcast Spreader
“The spreader I use on my own lawn — nothing else comes close.”
  • 60 lb hopper — covers up to 25,000 sq ft per load
  • Factory-calibrated spread pattern up to 8 ft wide
  • Maintenance-free gear case — no grease, no hassle
  • Foot-operated side deflector keeps product off driveways & beds
  • 10" pneumatic tires handle any terrain with ease
  • Powder-coated steel frame — 5-year consumer warranty
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My pH Meter Pick
Top Pick
Yamron 4-in-1 Soil Moisture, pH, Temperature & Sunlight Meter
“If you're going to fix your soil pH, you need to actually measure it first.”
  • 4-in-1: soil moisture, pH, temperature & sunlight intensity in one probe
  • Backlit LCD display — easy to read outdoors in any light
  • Digital readout — no guessing, no color charts
  • Push into soil and read instantly — no lab wait, no sending samples
  • Know your exact pH before calculating lime or sulfur rates above
Check Price & Availability →
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My Soil Sampler Pick
Top Pick
HiHydro 12 Inch Stainless Steel Soil Probe
“Before you amend anything, you need to know what you're working with. This probe makes soil sampling fast and clean.”
  • T-style handle gives you the leverage to core deep without straining
  • 12" stainless steel shaft reaches the root zone where it matters
  • Pull a clean soil core for sending to a lab or checking texture and moisture
  • Tells you whether you need lime, sulfur, or nothing at all before you spend a dime
  • Durable stainless construction — won't rust season to season
Check Price & Availability →
Affiliate link — I earn a small commission at no extra cost to you. I only recommend gear I personally use.

About Soil pH

Soil pH affects how well your grass can absorb nutrients. Even if you fertilize correctly, a poor pH can lock out nutrients. Most turf grasses prefer a pH of 6.0–7.0. Centipedegrass prefers slightly more acidic conditions around 5.5.