Every gardening calculator we build

Compost Calculator

Balance C:N ratios for greens and browns, dry matter mass, moisture %, and calculate exact corrective additions for active composting.

Gives you: mixture C:N ratio · moisture % · corrective mass addition · recipe status

Soil pH Calculator

Interpret soil pH readings from 0 to 14, classify soil acidity or alkalinity, map visual scale positions, and compare against crop preferred pH ranges.

Gives you: soil pH · classification · scale position % · crop compatibility status · compatibility score % · guidance

Topsoil Calculator

Calculate exact topsoil volume in cubic yards, cubic feet, and cubic meters for garden beds, lawns, and raised beds. Estimate bags and material costs.

Gives you: cubic yards · cubic feet · cubic meters · bags required · estimated cost

Potting Soil Calculator

Calculate potting soil volume in liters, gallons, quarts, cubic feet, and bags for pots, planters, and grow bags.

Gives you: liters · gallons · quarts · cubic feet · bags required · estimated cost

Raised Bed Soil Calculator

Calculate soil volume in cubic yards, cubic feet, liters, and bags for raised garden beds, planters, and soil layers.

Gives you: cubic yards · cubic feet · liters · bags required · soil layers · estimated cost

Soil Amendment Calculator

Calculate application rates and total weight (lbs/kg) of compost, lime, sulfur, gypsum, bone meal, or blood meal to adjust soil pH.

Gives you: total weight (lbs/kg) · 50lb bag count · application rate per 100 sq ft · till depth

Manure Application Calculator

Calculate manure application rates across 9 livestock sources, N-P-K nutrient delivery, and USDA pre-harvest food safety waiting intervals.

Gives you: manure weight (lbs/tons) · volume (cu yds) · N-P-K delivered · USDA harvest days

Lime Application Calculator

Calculate agricultural limestone (calcitic, dolomitic, pelletized, hydrated lime) needed to raise soil pH based on texture buffer capacity and ECCE.

Gives you: lime weight (lbs/tons) · 50lb bags · Ca & Mg nutrients · split application schedule

Gypsum Calculator

Calculate agricultural gypsum (calcium sulfate dihydrate) rates to break compacted clay, remediate sodic soils (ESP), and deliver calcium without altering pH.

Gives you: gypsum weight (lbs/tons) · 50lb bags · pure Ca & S supplied · leaching guidance

Organic Fertilizer Calculator

Calculate application rates for natural and organic fertilizers (blood meal, bone meal, feather meal, alfalfa, kelp, langbeinite, greensand) to meet N-P-K goals.

Gives you: organic meal weight · bag counts · N-P-K delivered · secondary nutrients

Nitrogen Calculator

Calculate pure elemental nitrogen (N) requirements, fertilizer product amounts (urea, ammonium sulfate, calcium nitrate, UAN liquid), and soil organic matter/legume credits.

Gives you: product weight/gallons · net N applied · soil credits deducted · split application advice

Phosphorus Calculator

Calculate phosphate (P₂O₅) and elemental phosphorus (P) fertilizer requirements (TSP, MAP, DAP, Bone Meal), soil test conversions, and starter banding efficiency.

Gives you: product weight · actual P₂O₅ & P · starter band advice · co-delivered nitrogen

Potassium Calculator

Calculate potash (K₂O) and elemental potassium (K) fertilizer requirements (MOP 0-0-60, SOP 0-0-50, Langbeinite 0-0-22), chloride safety, and luxury consumption prevention.

Gives you: product weight · actual K₂O & K · chloride safety alerts · secondary sulfur/magnesium

Fertilizer Requirement Calculator

Calculate complete fertilizer product requirements (10-10-10, 13-13-13, 20-20-20, 5-10-10, 16-4-8, custom) based on crop specific nutrient targets and soil fertility baseline tiers.

Gives you: product weight · bag counts · N-P-K surplus/deficits · split application schedule

Soil Moisture Calculator

Calculate gravimetric (θg) and volumetric (θv) soil moisture content, soil bulk density, plant available water (PAW), field capacity, and exact irrigation water deficit depth.

Gives you: water deficit (in/mm) · total gallons/liters · plant available water · MAD trigger status

Soil Drainage Calculator

Calculate soil percolation and infiltration rates (in/hr and mm/hr) from DIY perc tests, classify soil drainage quality, and size French drains and gravel volumes.

Gives you: infiltration rate (in/hr & mm/hr) · drainage class · plant suitability · French drain sizing

Soil Texture Calculator

Determine your official USDA soil texture classification from sand, silt, and clay percentages with an interactive mason jar sedimentation test calculator and CEC estimator.

Gives you: USDA texture class · sand/silt/clay % · estimated CEC · available water holding capacity

Soil Organic Matter Calculator

Calculate exact tons, cubic yards, and bags of compost, manure, biochar, or peat moss needed to increase Soil Organic Matter (SOM %) by your target percentage.

Gives you: amendment volume (cu yds) · weight (tons/lbs) · spread layer thickness · extra water holding capacity

Soil Calculator

Volume of soil, compost or mulch for beds and pots — plus how many bags that is.

Gives you: cu yd · cu ft · bags

Plant Spacing Calculator

How many plants fit a bed at a given spacing, using square-foot gardening densities.

Gives you: plants per bed · rows

Watering Schedule

How much water a planting needs each week, adjusted for plant type and season.

Gives you: volume per week · frequency

Fertilizer Mixer

Calculate exact N-P-K fertilizer mix quantities, solve multi-fertilizer equations, and target nutrient rates.

Gives you: fertilizer weights · achieved N-P-K · surplus/deficiency

Square Foot Planner

Design mathematically optimized Square Foot Garden layouts with grid spacing, companion rules, and density calculations.

Gives you: grid layout · plant counts · efficiency %

Mulch Calculator

Calculate exact mulch volume (cu ft, cu yd, bags), net area minus exclusions, waste/settling allowance, weight, and cost.

Gives you: cubic yards · bag count · net area · estimated cost

Seed Starting Calculator

Calculate indoor seed sowing dates, germination schedules, hardening off timelines, and seed cell tray requirements for spring garden crops.

Gives you: target indoor sow date · estimated sprout date · hardening off date · total seeds & cells

Transplant Date Calculator

Calculate target outdoor transplanting dates, indoor seed sowing windows, hardening-off schedules, and soil warmth readiness.

Gives you: outdoor transplant date · indoor sow date · hardening off window · soil temp

Crop Spacing Calculator

Calculate total crop plant capacity, row counts, in-row plant spacing, and planting density using grid or staggered triangular patterns.

Gives you: total plants · row count · plants per row · density per acre/ha

Row Spacing Calculator

Calculate recommended row widths based on crop mature canopy spread, tractor equipment tire width, walking paths, and linear row feet.

Gives you: recommended row width · linear feet per acre · rows per 100ft

Plants Per Square Foot Calculator

Calculate plant population for Square Foot Gardening (SFG) grid layouts, total plants per bed, cell arrangements, and seed budget.

Gives you: plants per sq ft · total bed capacity · 1x1 ft grid squares · seed budget

Garden Bed Calculator

Calculate raised garden bed soil volume in cubic yards and feet, bag counts, lumber board feet, corner posts, and material costs.

Gives you: soil volume (cu yd/ft) · soil bag counts · board feet lumber · material cost

Garden Area Calculator

Calculate garden plot surface area and perimeter for rectangular, circular, triangular, and L-shaped gardens minus pathway deductions.

Gives you: gross area · net plantable area · perimeter fence length · pathway deduction

Garden Volume Calculator

Calculate 3D volume of soil, compost, mulch, pea gravel, or potting mix in cubic yards, cubic feet, liters, and bag counts.

Gives you: cubic yards · cubic feet · liters · bag counts · total weight (lbs/tons)

Flower Bed Calculator

Calculate number of annual or perennial flowers, mulch volume, compost top-dressing, and border edging length needed for flower beds.

Gives you: total flowers · plant spacing · mulch volume (cu yd/bags) · edging length

Drip Irrigation Planner

Design and validate drip irrigation systems: plant water demand, emitter counts, zone flow rates, runtimes, pressure loss, and sequential schedules.

Gives you: daily water demand · total flow · runtimes · hydraulic feasibility status

Drip Irrigation Pump Calculator

Calculate total drip irrigation flow demand, required pump flow, static lift, Hazen-Williams friction loss, Total Dynamic Head (TDH), and pump curve selection criteria.

Gives you: total emitter flow · design pump flow · static lift · friction head loss · Total Dynamic Head (TDH ft & PSI) · WHP

Drip Flow Rate Calculator

Calculate drip emitter flow rates, total system discharge in GPH, GPM, LPH, and L/min, multi-zone simultaneous/sequential operation, variable emitter groups, event water volume, and daily usage.

Gives you: GPH per emitter · total GPH · GPM · LPH · L/min · water per event · daily water consumption

DWC Calculator

Calculate Deep Water Culture (DWC) hydroponic reservoir volume, operating capacity, liters per plant, multi-part nutrient dosing (Part A/B/C), partial water replacement, and target EC/TDS.

Gives you: reservoir capacity · operating volume · volume per plant · Part A/B/C nutrient mL · refill quantities

Aeroponics Calculator

Calculate aeroponic misting intervals, mist duration duty cycle, daily misting frequency, total daily run time, multi-part nutrient dosing (Part A/B/C), and nozzle flow rates.

Gives you: misting cycles/hr · daily cycles · total daily mist mins · duty cycle % · Part A/B/C nutrient mL · nozzle flow

Rainwater Calculator

Calculate gallons of rainwater collected from your roof, plus the tank size needed to capture a storm without overflow.

Gives you: gallons collected · annual savings · recommended tank size · garden demand offset

Irrigation Scheduling Calculator

Calculate optimal irrigation frequency, allowable soil moisture depletion (MAD), and net/gross application depth using FAO-56 agronomic water balance math.

Gives you: watering interval (days) · net/gross depth · cycle volume (gal/L) · depletion timeline

Irrigation Run Time Calculator

Calculate precise sprinkler and drip irrigation runtime in minutes per zone. Features automated cycle-and-soak splits based on soil infiltration and slope.

Gives you: total runtime (minutes) · cycle & soak splits · max run before runoff · applied volume

Sprinkler Calculator

Calculate total sprinkler zone GPM flow rate, matched precipitation rate (in/hr), pipe sizing, and water supply feasibility for spray heads and rotors.

Gives you: total zone flow (GPM/LPM) · precipitation rate (in/hr) · pipe sizing (5 fps rule) · cycle volume

Sprinkler Coverage Calculator

Calculate sprinkler head spacing, total heads needed, square vs. triangular layout geometry, overlap percentage, and distribution uniformity (DU).

Gives you: total heads required · head/row spacing · distribution uniformity (DU) · precipitation rate

Drip Emitter Calculator

Calculate the exact number of drip emitters per tree, shrub, or vegetable bed. Determines emitter GPH, wetted bulb coverage, placement radius, and runtime.

Gives you: emitters per plant · placement radius · zone flow rate · watering event runtime

Rain Barrel Calculator

Calculate how many 50 or 55-gallon rain barrels your roof will fill from a rainstorm. Determine storage capacity, overflow volume, and garden reserve days.

Gives you: harvested volume (gal/L) · barrels filled · garden reserve days · storm capture table

Seed Calculator

Calculate exact seed quantities, packets to buy, and weight in grams or ounces for vegetables, herbs, and flowers based on garden dimensions.

Gives you: recommended seeds to buy · packets count · seed weight (g/oz) · planting positions

Seed Germination Calculator

Calculate seed germination percentage, determine how many seeds to sow for target seedlings, and plan seed trays.

Gives you: germination rate % · seeds to sow · expected seedlings · seed trays · packets required

Seed Rate Calculator

Calculate required seed quantity, seeds per acre or hectare, plant population, thousand seed weight, packet counts, and estimated cost.

Gives you: seed quantity · seeds per acre/ha · plant population · TSW · package count · total cost

Plant Population Calculator

Calculate total plant population, plants per acre or hectare, row spacing density, practical layout rows, and required seed quantities.

Gives you: plant population · plants per acre/ha · practical row layout · target equal spacing · required seeds

Plants Per Acre Calculator

Calculate commercial agricultural plant population per acre or hectare, linear row feet, headland margins, and seed volume.

Gives you: plants per acre · plants per hectare · total population · seed volume

Crop Yield Calculator

Calculate estimated total crop yield, net harvest after losses, yield density per acre or hectare, and expected crop market revenue.

Gives you: gross & net yield · yield per acre/ha · harvest loss adjustment · market revenue ($)

Harvest Date Calculator

Calculate estimated crop harvest dates, maturity window ranges, and growth countdowns based on planting date and variety days to maturity.

Gives you: target harvest date · early/late harvest window · days countdown · maturity rating

Crop Water Requirement Calculator

Calculate net and gross irrigation water requirements for field and garden crops. Features FAO-56 stage-specific Kc values, effective rainfall, and volume in gallons or acre-feet.

Gives you: gross volume (gal/m³) · net demand (in/mm) · effective rainfall credit · peak daily volume

Evapotranspiration Calculator

Calculate daily and monthly reference evapotranspiration (ET0) and crop water use (ETc) using the Hargreaves-Samani temperature-radiation equation.

Gives you: daily ET0 (in/mm) · daily crop ETc · weekly loss · solar radiation (Ra)

Companion Planting Calculator

Interactive companion planting guide and garden matrix. Discover best companion plants, avoid harmful neighbors, and deter pests naturally.

Gives you: beneficial companions · antagonistic foes · pest defense profile · polyculture bed audit

Crop Rotation Calculator

Plan multi-year garden bed crop rotations. Balances heavy feeders, nitrogen-fixing legumes, and root crops to prevent soil diseases and boost fertility.

Gives you: 3 to 6-year bed matrix · pathogen break gap · soil amendment schedule · nitrogen cycling

Succession Planting Calculator

Calculate staggered planting dates and intervals for continuous vegetable harvests. Determines batch sow dates, harvest windows, and final fall cutoff dates.

Gives you: batch sowing timeline · final fall cutoff date · harvest window span · total batches

Greenhouse Size Calculator

Calculate optimal greenhouse dimensions, usable growing bench space, plant tray capacity, winter heating BTUs, and ventilation CFM requirements.

Gives you: usable bench space (sq ft/m²) · 1020 tray capacity · heating BTU/hr · exhaust fan CFM

Sun Exposure Calculator

Calculate exact direct sunlight hours, solar elevation/azimuth, 3D obstruction shade maps, and plant placement recommendations.

Gives you: direct sunlight hours · sun category · best cell recommendation

Planting Calendar

Calculate exact indoor seed starting, outdoor transplanting, direct sowing, fall planting, and harvest dates based on hardiness zones and local frost dates.

Gives you: best planting window · indoor start date · transplant date · harvest window · succession dates

Growing Degree Days Calculator

Calculate daily and accumulated Growing Degree Days (GDD) for crops, predict harvest timing, and monitor plant thermal units.

Gives you: daily GDD · total period GDD · crop maturity progress % · days to harvest

Chill Hours Calculator

Calculate accumulated winter chill hours and Utah chill units for fruit and nut trees to ensure adequate dormancy release.

Gives you: accumulated chill hours · % requirement met · chill deficit · bloom risk assessment

First Frost Date Calculator

Calculate autumn first frost date countdowns, last safe planting dates, and freeze severity risk for tender garden crops.

Gives you: first frost date · days countdown · last safe sowing date · frost risk assessment

Last Frost Date Calculator

Calculate spring last frost date countdowns, safe outdoor planting windows, and indoor seed starting dates based on crop cold hardiness.

Gives you: last spring frost date · target outdoor planting date · indoor sowing window · hardening off date

Tree Spacing

Trees per acre for a given spacing, on square or triangular layouts.

Gives you: trees per acre · row spacing

Black Walnut Value

Board-foot volume and rough timber value from trunk diameter and height.

Gives you: board feet · value range

Acres Per Hour

Field capacity from implement width, ground speed and working efficiency.

Gives you: acres/hour · hours per field

Land Clearing Cost

Per-acre clearing cost by terrain, tree density and hire vs. DIY.

Gives you: cost per acre · total

Garden Cost Estimator

Setup and running cost for a new plot — beds, soil, plants and tools.

Gives you: setup cost · annual cost

Tree Removal Cost Calculator

Estimate the cost to remove a tree based on height, trunk diameter, site accessibility, nearby obstacles, state labor rates, and stump services.

Gives you: estimated cost range (Low-High) · typical total · itemized cost breakdown · safety warnings

Tree Trimming Cost Calculator

Estimate professional tree trimming and pruning costs based on height, DBH, canopy spread, pruning objective, accessibility, and debris cleanup.

Gives you: estimated price range (Low-High) · typical total · itemized pruning breakdown · arborist safety warnings

Tree Age Calculator

Estimate tree age non-invasively from trunk circumference or diameter (DBH) using forestry species growth factors and site growing conditions.

Gives you: estimated tree age · likely age range (Low-High) · species growth factor · measurement conversion

Oak Tree Value Calculator

Estimate the potential value range of an oak tree based on trunk diameter (DBH), species (White Oak, Red Oak, Bur Oak), health, form quality, and market category.

Gives you: estimated value range (Low-High) · typical appraisal · CTLA / Doyle volume · accessibility score

Greenhouse Calculator

Calculate total greenhouse build costs, exposed surface area, volume, thermal heat loss, required BTU/hr heating capacity, kW, and commercial heater sizing.

Gives you: total build cost · required BTU/hr · kW equivalent · recommended heater size · project estimate

Grow Light Calculator

Calculate grow light coverage area, light footprint diameter, estimated average PPFD (μmol/m²/s), total PAR photon output (PPF μmol/s), recommended hanging height, fixture count, Daily Light Integral (DLI), and electricity cost.

Gives you: growing area · footprint diameter · PAR photon output (PPF) · estimated PPFD · DLI · required fixtures · power cost

VPD Calculator

Calculate Vapor Pressure Deficit (VPD) in kPa using air temperature, relative humidity, and optional leaf temperature, featuring Tetens equation and plant stage transpiration targets.

Gives you: VPD (kPa) · Air SVP · Leaf SVP · AVP · transpiration category · crop stage target match

Hydroponic System Cost Calculator

Calculate initial setup equipment costs, recurring nutrient and water expenses, kWh electricity consumption, cost per plant, and total growing cycle expenses for hydroponic systems.

Gives you: setup CAPEX · recurring OPEX · electricity kWh & cost · setup cost per plant · cycle cost per plant · monthly OPEX

Grass Seed Calculator

Calculate how much grass seed to buy for a new lawn, overseeding, or patch repair, by species and lawn area.

Gives you: seed weight (lb) · bags to buy · total cost · approx. seed count

Lawn Fertilizer Calculator

Calculate exact fertilizer product weight, bags to buy, and actual N, P₂O₅, K₂O, plus elemental P & K nutrients applied based on N-P-K ratios and lawn area.

Gives you: fertilizer product weight · bags to purchase · actual N-P-K supplied · elemental P & K

Sod Calculator

Calculate exact sod rolls, pieces, pallets, and square feet required to install a new lawn based on property dimensions, excluded non-sod areas, and cutting waste.

Gives you: recommended sod area · rolls to order · pallets required · square yards equivalent