Calculate how much lime your lawn needs, based on area and soil type, so you buy the right number of bags.
The calculator multiplies the lawn area by the recommended lime amount per square meter for the selected soil type:
For a 150 m² lawn with normal soil (150 g/m²), you need 150 × 150 = 22,500 g, i.e. 22.5 kg of lime — equivalent to 1 bag of 25 kg.
Liming adjusts the soil's pH level, making nutrients more available to the grass and giving healthier, denser growth. Clay soil is often naturally more acidic than sandy soil, and therefore needs more lime to reach the same pH level.
Spring and fall are the best times for liming. Avoid liming during dry spells or right before heavy rain, since much of the lime can wash away before it has a chance to work.
Clay soil often has a more acidic natural pH and greater buffering capacity, meaning more lime is required to noticeably raise the pH compared to lighter sandy soil.
Yes. Too high a pH can make certain nutrients less available to the grass and favor weeds. Follow the recommended amount, and consider taking a soil test before liming repeatedly year after year.