Lime Requirement Calculator
Calculate lime needed to adjust soil pH
About this calculator
The Lime Requirement Calculator helps gardeners and farmers determine the exact amount of lime needed to adjust their soil pH to optimal levels for plant growth. By calculating precise lime requirements, you can avoid over-liming or under-liming your soil, which can harm plant health and waste money. This tool considers your current soil pH, target pH, soil type, and area size to provide accurate lime application rates, ensuring your plants receive the proper growing conditions they need to thrive.
How to use
Enter your current soil pH level (from a soil test), desired target pH, soil type, and area to be treated. The calculator will determine the pounds of lime needed per square foot or acre. Apply the recommended amount evenly across your soil and work it in 6-8 inches deep for best results.
Frequently asked questions
How do I test my current soil pH?
Use a digital pH meter, pH test strips, or soil test kit. For most accurate results, collect soil samples from multiple areas and test at 4-6 inch depth.
What's the ideal pH range for most plants?
Most plants prefer slightly acidic to neutral soil with pH between 6.0-7.0. Vegetables typically thrive at 6.0-6.8, while acid-loving plants prefer 4.5-6.0.
How long does it take for lime to change soil pH?
Lime typically takes 3-6 months to fully react with soil and change pH. Apply lime in fall for spring planting, or test soil again after 6 months.