Yes — all tools work for indoor hydroponics, greenhouse growing, and outdoor soil gardening. The pH Calculator, EC/TDS Calculator, and Nutrient Calculator are optimised for hydroponic water chemistry, while the Soil NPK Calculator, Compost Calculator, and Mulch Calculator are designed for soil and raised bed growing.

No experience required. Every calculator includes a step-by-step how-to guide, a reference table showing ideal values for common crops, and a problems section explaining what to do when readings are wrong. Complete beginners typically start with the Seed Germination Timer and pH Calculator — the two most important tools for starting your first grow.

Yes — all 17+ tools are completely free with no signup, no account, and no limits on usage. Every tool works directly in your browser and saves no personal data. We keep them free by publishing helpful growing guides alongside the tools — you get accurate calculators, we get to share what we know about growing.

For hydroponic growers: start with the pH Calculator and EC/TDS Calculator — these are the two measurements you’ll check every single day. For soil growers: start with the Soil NPK Calculator and Compost Calculator. For anyone starting seeds: use the Seed Germination Timer first to plan your planting schedule before anything else.

The crop data in our calculators is based on widely published horticultural research and commercial growing standards. The EC ranges, pH targets, germination timelines, and growth rates represent average values for well-managed growing conditions. Your specific results will vary based on your seed variety, local water chemistry, lighting setup, and growing environment — use the tool outputs as your starting target, then adjust based on your plants’ actual response.