Garden math, answered.

5 free, source-cited calculators for growers who want a number, not a newsletter.

5 tools3 long-readsUpdated weekly

In this issue

A field guide to spring soil preparation

pH, drainage, amendments — the three decisions to make before the last frost.

Featured calculators

The most-used tools this week

Drawn from search traffic and University Extension citations.

Calculate your compost C:N ratio, bin volume, and get balancing recommendations.

Garden

Get a personalized watering schedule based on your plant, soil, season, and growing method.

Garden

Calculate how much lime or sulfur you need to reach your target soil pH.

Garden

Calculate recommended row spacing, plant spacing, and total seed count for your garden.

Garden

Calculate NPK fertilizer dosage for any crop or garden area.

Garden

From the Almanac

Each guide pairs with a calculator and cites its University Extension sources.

Almanac · Soil

A field guide to reading your soil — what pH actually means for root uptake, and how to correct it over a season.

12 min read

Almanac · Composting

Greens, browns, ratios, and the two-pile rhythm that actually works on a small lot.

14 min read

Almanac · Fertilizer

NPK, side-dressing, and the three deficiency signs every small-plot grower should recognize.

11 min read

Every calculator cites at least two .edu or .gov references — no Reddit, no Brainly.

Home gardeners, community plots, and master-gardener programs.

Client-side calculators. Nothing to register. Embed freely.