Wheelbarrow Loads Calculator
How many level wheelbarrow loads a volume of soil, mulch or gravel fills, and the hauling time it takes by barrow size.
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Tools & Calculators
Every tool in one place. Search or pick a category, then start doing the math.
Soil & Raised Beds
Soil volume, blends, bed dimensions and drainage.
New New Soil Percolation Test Calculator
Convert a percolation test timing into inches per hour drainage rate, NRCS-style class and a raised-bed root-zone verdict.
Use ToolNew Lime Application Calculator
Reads a two-way soil texture by pH table for pounds of lime per 1,000 sq ft, then sizes total pounds and bags for your area.
Use ToolNew Soil Texture Triangle Calculator
Enter sand, silt and clay percentages to classify your soil into one of the twelve USDA texture classes, with drainage, plant-available water and a handling verdict.
Use ToolNew Soil Organic Matter Builder
Convert an area and a spread depth into cubic yards, tons and bags, then estimate the soil organic matter rise that application actually buys.
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Plant Spacing
Square-foot layouts and companion spacing.
New Vertical Garden Calculator
Pocket count, saturated wall weight against your mount limit, and daily irrigation litres for a fabric, pipe, stacked or trellis vertical garden.
Use ToolNew Pollinator Garden Calculator
Seed ounces, plug count, pounds per acre and establishment weeks for a pollinator or butterfly patch from area and mix type.
Use ToolNew Companion Planting Checker
Check whether two crops make good or bad companions, see why, and size the main crop's plant count for your bed area using each pairing's spacing.
Use ToolNew Garden Planner Grid
Lay out a square-foot garden on an interactive grid: set your bed size, click to plant each crop, and watch plants-per-crop and total seedlings tally as you plan.
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Watering & Irrigation
Drip flow rates, run times and rainwater catchment.
New Garden Watering Cost Calculator
Gallons and dollars a season of watering will cost you, by water source, from bed area, depth, and watering frequency.
Use ToolNew Drip Flow Rate Calculator
Converts emitter gph into gpm and lpm, totals a zone, and times the run needed to apply a chosen water depth.
Use ToolNew Rain Barrel Calculator
How many barrels and how much storage your roof can fill, sized against weekly garden demand from area and rainfall.
Use ToolNew Crop Water Requirement Calculator
Weekly and seasonal irrigation gallons a planting needs, from area, reference evapotranspiration minus rainfall.
Use ToolNew Irrigation Scheduling Calculator
Soil-aware watering schedule: allowable depletion depth, refill volume in gallons and days between waterings at your management deficit.
Use ToolNew Rain Garden and Swale Calculator
Size a rain garden or swale from roof runoff and soil infiltration, with required bed area, overflow, drain time and a planting count.
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Fertilizer & Nutrients
NPK, soil pH and organic dosing calculators.
New Organic Fertilizer Calculator
Pounds and bags of an organic meal needed to hit a nitrogen target, by product N percentage and price.
Use ToolNew Phosphorus and Potassium Fertilizer Calculator
Pounds and bags of phosphate or potash product to meet a P2O5 or K2O recommendation, with elemental nutrient shown.
Use ToolNew Manure Application Calculator
Size a manure application from nitrogen need, per-ton N content and first-year availability, with food-safety waiting periods.
Use ToolNew Water pH Adjustment Calculator
Sizes a split-dose acid schedule for irrigation or spray water from source buffer strength, gallons and the pH drop you need.
Use ToolNew Gypsum Application Calculator
Reads a texture-by-purpose table for gypsum pounds per 1,000 sq ft, then converts your area into bags, calcium and sulfur, split by pass.
Use ToolNew Soil Test Interpretation Calculator
Enter a soil-test nutrient reading in ppm and the calculator sorts it against published low and high lines into Deficient, Adequate or Excessive, then names the optimal range and the correction.
Use ToolNew Fertilizer Blend Solver
Mix bagged fertilizers into a blend that hits your exact N-P-K target: enter the pounds of nitrogen, phosphate and potash you want, pick two or three products, and the solver finds the closest match and its cost.
Use ToolNew Fertilizer Cost per Nutrient Calculator
Compare any fertiliser on price per pound of nitrogen, phosphate and potash, then cost the real application for your area and rate.
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Planning & Yield
Season planners, succession sowing and harvest math.
New Plant Population Calculator
Plants per acre and per square foot from row spacing and in-row spacing, scaled to your plot with a seed-order estimate.
Use ToolNew Growing Degree Days Calculator
Daily and season GDD accumulation from high and low temperature, with corn-style caps and a progress read toward harvest or pest action.
Use ToolNew Chill Hours Calculator
Compare your winter's accumulated chill hours against a variety's requirement for a percent-of-need verdict on budbreak reliability.
Use ToolNew Frost Risk Calculator
Read a forecast temperature against your crop's kill point for a damage verdict, frost severity class and cover recommendations.
Use ToolNew Harvest Date Calculator
Add days to maturity to a planting date for a calendar harvest date, with the margin left before first fall frost.
Use ToolNew Succession Planting Calculator
Six staggered sow-and-harvest date pairs from a start date and interval, turning one glut into a season of steady harvests.
Use ToolNew Grain Bin Storage Calculator
Bushels, pounds, tons and floor load for a round bin from diameter and depth, with a safe-moisture margin by grain.
Use ToolNew Planting Calendar by Zone
Pick a crop and your USDA zone band to get its planting window, whether it is a cool or warm-season crop, and its days to maturity — one at-a-glance sowing reference instead of a dozen date calculators.
Use ToolNew Crop Rotation Planner
Build a multi-year bed-by-bed rotation: set your beds and starting families, and the planner cycles each bed through legumes, brassicas, fruits and roots so no crop repeats in place.
Use ToolNew Sun Exposure & Shade Calculator
Model the real sun on your site from latitude, date and what shades it: get solar declination, noon height, day length and peak sun hours, then verify with a stick-and-shadow survey. No map or account needed.
Use ToolNew Carbon Sequestration Calculator
Estimate carbon dioxide stored and absorbed by your trees from trunk diameter, species wood factor and age, with a driving-offset equivalent.
Use ToolNew Corn and Grain Yield Calculator
Estimate a grain harvest from plant count and seeds per plant, then convert it into bushels, weight, per-acre yield and a realistic verdict.
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Indoor & Hydroponics
Grow light, nutrient solution and reservoir sizing.
New Kratky Method Calculator
Reservoir size in gallons and liters for passive Kratky hydroponics, by crop and plant count, with a bucket count suggestion.
Use ToolNew CO2 Supplement Calculator
Grams of CO2 to lift a tent or room to target ppm, the ppm each gram buys, and how long a tank or burner supply lasts.
Use ToolNew Aquaponics Fish to Plant Ratio Calculator
Balance stock from grow-bed area: fish biomass, daily feed allowance, plants fed and minimum water volume by system type.
Use ToolNew VPD Calculator
Vapor pressure deficit from temperature and humidity using Tetens' equation, with stage-appropriate kPa verdicts for tents and rooms.
Use ToolNew Mushroom Substrate Calculator
Wet substrate weight, flush yield, pasteurization hours by method and a colonization finish date for a dry-weight recipe.
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Lawn & Turf
Seed rates, sod counts and sprinkler run times.
New IPM Economic Threshold Calculator
Scout count per sampled area against published action thresholds for a treat-or-hold verdict, with spray volume sized for the lawn.
Use ToolNew Spreader Setting Calculator
Dial setting by product and spreader type from a two-way chart, plus application rate, bag count and coverage for your lawn.
Use ToolNew Overseeding Timing Calculator
Turns your frost dates and a soil reading into a seed-by day for fall, spring or dormant overseeding, with a germination check.
Use ToolNew Fungicide Re-Spray Interval Calculator
Estimates how much of a fungicide coat rain removed and when to re-spray, from rainfast hours, rainfall and product residual life.
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Seeds & Propagation
Germination tests, sowing density and potting mixes.
New Direct Seeding Row Length Calculator
Seeds to sow for your row length by crop, how many feet one packet covers, and the packets and cost to buy.
Use ToolNew Plug Tray Calculator
Cells to sow and plug trays to buy for your target transplants, adjusted for germination, plus tray cost.
Use ToolNew Seed Starting Date Calculator
Counts back from your last frost date through indoor weeks and hardening off to the date to sow each crop indoors.
Use ToolNew Transplant Date Calculator
Dates the move: crop-specific offset from last frost gives transplant and hardening days plus seedling age at setting.
Use ToolNew Heat Mat Germination Calculator
Days to sprouts by crop and soil temperature band, plus the germination date, mat wattage and the electricity cost of the run.
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Landscaping & Hardscape
Rock tons, pine straw bales and material coverage.
New Garden Fencing Calculator
Fencing feet, line posts, and total material cost for a rectangular garden or orchard fence by fence type.
Use ToolNew Patio Paver Calculator
Number of pavers, bedding sand, and material cost for a rectangular patio by paver size, with a waste allowance.
Use ToolNew Pond Fish Stocking Calculator
How many fish a pond volume can humanely hold by species, the biomass it means, and the stocking cost.
Use ToolNew Mulch Weight & Cost Calculator
Converts a mulch order in cubic yards into pounds, tons, bag counts and price by material, using typical densities.
Use ToolNew Concrete Edging Calculator
Bags of concrete mix for a curb or flat edging run, from linear feet, profile size and coverage per bag.
Use ToolNew Retaining Wall Block Calculator
Block count, capstones, weight and drainage stone for a segmental retaining wall from length and height.
Use ToolNew Slope and Terrace Soil Calculator
Average depth across a taper, cubic yards with settle allowance, bags, delivered tons and cost for terracing or filling a slope.
Use ToolNew Tree Diameter (DBH) Calculator
Turn trunk circumference into diameter at breast height in inches, centimetres and feet, plus basal area, Doyle log scale and a size class.
Use ToolNew Tree Height Calculator
Estimate a tree's height from its shadow using a reference object and similar triangles, with the current sun angle and a height class.
Use ToolNew Tree Age Calculator
Estimate a tree's age from trunk diameter and species growth factor, adjusted for site, with an age range and a life-stage verdict.
Use ToolNew Livestock Fencing Calculator
Turn paddock acreage and shape into perimeter, panels, posts, strand footage and a species-based barrier height recommendation.
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