Seed spacing, soil volume, compost ratio, and garden planning calculators. Browse our free gardening tools below — all calculators are instant, accurate, and require no sign-up.
Bacteria Growth Calculator — Calculate bacterial population growth using exponential and logistic models. Estimate doubling time, generation count, and colony size over time.
Basal Area Calculator — Calculate tree basal area from diameter at breast height (DBH). Estimate stand density, basal area per acre, and stocking levels for forest management.
Bulb Spacing Calculator — Calculate optimal planting spacing and quantity for flower bulbs. Covers tulips, daffodils, crocuses, hyacinths, and more with depth and density guides.
CO₂ Grow Room Calculator — Calculate CO₂ supplementation needs for indoor grow rooms. Determine tank size, flow rate, and cost to reach optimal PPM levels for plant growth.
Compost Calculator — Calculate compost pile volume, carbon-to-nitrogen ratio, and material quantities. Plan optimal green/brown mixes for fast, efficient composting.
Corn Yield Calculator — Estimate corn yield per acre using ear counts, kernel rows, and kernel weight. Calculate bushels per acre with the yield component method.
Daily Light Integral (DLI) Calculator — Calculate DLI from PPFD and photoperiod. Determine if your grow lights provide enough light for optimal plant growth with PAR-based analysis.
Fertilizer Calculator — Calculate fertilizer application rates from NPK ratios. Determine how much product to apply per area to meet soil test recommendations for any crop.
Grass Seed Calculator — Calculate grass seed quantity for new lawns and overseeding. Coverage rates for Kentucky bluegrass, fescue, bermuda, zoysia, and more by area.
Plants per Area Calculator — Calculate how many plants fit in a garden bed, row, or field. Covers grid, staggered, and row spacing for vegetables, flowers, and ground covers.
Potting Soil Calculator — Calculate potting soil volume for containers, raised beds, and planters. Covers standard pots, grow bags, window boxes, and custom shapes.
Soil Amendment Calculator — Calculate soil amendments needed for pH correction and nutrient optimization. Covers lime, sulfur, gypsum, compost, and fertilizer rates by soil type.
Tree Age Calculator — Estimate tree age from diameter, circumference, or species growth factor. Covers 40+ North American tree species with USDA growth factors.
Tree Diameter Calculator — Calculate tree diameter from circumference, or estimate diameter and basal area at breast height (DBH). Covers single and multi-stem trees.
Tree Height Calculator — Estimate tree height using shadow method, stick method, or clinometer angle. Covers multiple measurement techniques with step-by-step instructions.
Tree Leaf Area Calculator — Estimate total leaf area and leaf count for trees. Calculate canopy density, LAI, and biomass from crown dimensions and species data.
Tree Value Calculator — Estimate tree value using the Council of Tree and Landscape Appraisers (CTLA) trunk formula method. Covers species, condition, and location factors.
Vegetable Seed Calculator — Calculate vegetable seed quantity for your garden. Covers direct sowing, transplants, succession planting, and 30+ common vegetables.