Organic gardening calculators for backyard growers who already know the basics and want the math behind the choices. Soil test interpretation. Compost C:N. Cover crop rates.
The organic gardening internet is mostly two layers. Beginner content telling you to mulch and compost (you knew that). Or YouTube growers selling courses about their $40k market garden setup (you're a backyard grower, not a startup farmer). Middle ground is where the actual math lives.
These tools live in the middle. The compost ratio that doesn't smell bad. The cover crop seeding rate for a 200 sq ft bed. What the soil test number actually means and how much amendment you need.
Tools
Soil Test Interpreter
Plug in your soil test results (pH, P, K, organic matter, CEC). Get amendment recommendations for your target crop and what each amendment actually does.
Compost C:N Ratio Calculator soon
Mix grass clippings + leaves + kitchen scraps + manure to hit the 25-30:1 ratio that breaks down without odor. By volume, not weight (more practical).
Cover Crop Seeding Rate soon
Pounds of seed per 1000 sq ft for winter rye, hairy vetch, crimson clover, buckwheat, and mixes. With "when to terminate" calendar by climate zone.
Plain note about money: Some product links are affiliate (eBay Partner Network). Small commission on purchases. Doesn't change your price. The reviews come from actual garden time. Some excellent products are made by small farms without affiliate programs; I name them anyway.