Bacteria Growth Calculator
Calculate bacterial population growth using exponential and logistic models. Estimate doubling time, generation count, and colony size over time.
Free Gardening Calculators
19 toolsSeed spacing, soil volume, compost ratio, and garden planning calculators. Browse our free gardening tools below — no sign-up required.
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.
Water-Soluble Fertilizer Calculator
Calculate mixing ratios for liquid fertilizer concentrate. Covers PPM targets, dilution rates, stock solutions, and injector ratios.