Soil Calculator
Calculate exactly how much compost, lime, fertiliser, and soil amendments your garden or homestead needs — instantly and for free.
Soil Amendment Calculator
Tell us about your soil and garden size. We will calculate exactly what amendments you need to create the perfect growing environment.
Soil pH Correction Calculator
Soil pH affects every nutrient your plants can absorb. Most vegetables need pH 6.0 to 7.0. Enter your current pH and target pH to find out exactly how much lime or sulphur to add.
pH 6.0 – 7.0
pH 4.5 – 5.5
pH 5.0 – 6.0
pH 6.0 – 7.0
pH 6.0 – 7.0
pH 4.5 – 6.0
Compost Volume Calculator
Calculate exactly how much compost you need to amend your garden beds, and how much raw material you need to make it yourself. Turn kitchen and garden waste into liquid gold.
Topsoil & Raised Bed Calculator
Calculate exactly how many cubic yards or bags of topsoil, garden mix, or raised bed soil you need to fill your beds. Never over-order or under-order again.
Why Soil Quality Is the Foundation of Every Successful Homestead
Every experienced homesteader knows the same truth — you are not growing plants, you are growing soil. The quality of your soil determines the quality of your vegetables, the health of your pasture, the productivity of your orchard, and ultimately the food security of your family. A soil calculator like this one helps you stop guessing and start growing with precision.
Whether you are preparing raised beds for the first time, correcting pH for blueberries, calculating how much compost your homestead needs annually, or figuring out how many bags of topsoil to order — getting the numbers right from the start saves money, time, and the heartbreak of a failed harvest.
🧪 Understanding Soil Amendments
Soil amendments are materials you add to your soil to improve its physical properties or nutrient content. The right amendments depend entirely on your starting soil type.
- Sandy soil needs organic matter to improve water and nutrient retention — compost and aged manure are your best tools.
- Clay soil needs gypsum, sharp sand, and organic matter to improve drainage and break up compaction.
- Acidic soil (low pH) needs agricultural lime to raise pH toward the neutral range most vegetables prefer.
- Alkaline soil (high pH) needs elemental sulphur or acidic organic matter like pine bark to lower pH.
🌱 The Homesteader's Soil Guide
Building great soil is a multi-year process, but these principles guide every decision.
- Test your soil pH every year. Most vegetable crops need pH 6.0 to 7.0 — outside this range, nutrients become unavailable even if you fertilise.
- Add 2 to 3 inches of compost annually. This single practice improves every soil type and builds long-term fertility.
- Never work wet clay soil. Working clay when wet destroys its structure and creates compaction that can take years to reverse.
- Cover your soil. Bare soil loses fertility to erosion and weather. Use mulch, cover crops, or living ground cover between seasons.
Soil Calculator FAQs
Related Homesteading Guides
Put your soil knowledge to work with these in-depth guides from Rediscover Rural.