RootCalcs

What it does

Six free calculators for the questions every gardener guesses at: how much soil, when to start seeds, how many plants fit, when to replant, whether old seed is viable, and how to balance compost. Every formula documented. No login, no paywall.

Free garden calculators that give you a straight answer. Enter your numbers, get exactly what to buy, sow, or plant. No login, no fluff.

Every tool takes your numbers and returns exactly what to buy, sow, or plant — nothing else. Exact cubic feet, bags needed, and cost estimate for any bed size or mix recipe. Count back from your last frost date to find the right indoor sowing week. Get exact row and in-row spacing for any crop in any bed size. Schedule repeat sowings so you always have something ready to harvest. Balance browns and greens to hit the right C:N ratio for fast decomposition. Every formula is documented and explained on the calculator page. You can verify the arithmetic yourself. No account, no email wall, no paywall. Open the calculator, enter your numbers, get your answer. Designed for a small screen with one…from rootcalcs.com

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