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The Library.

131 calculators, guides, and reference tools · Use them in the browser, embed them anywhere

Tools: 131
Grouped by: 14 domains
Cost: Free — no account, no signup
Curated paths: Each stack links its own tools

Every tool runs right in the browser — no account, no install. Browse by domain below, or filter to find one fast. Each stack also links the tools for its own domain.

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Light & photoperiod 13

Cost-per-DLI Calculator

What does it cost to deliver target DLI in your room? The economic-decision metric for fixture selection.

Light & photoperiod

Day/Night DIF Designer

Day-night temperature differential. Control stretch and morphology without chemical PGRs.

Light & photoperiod

Daylight Calculator

Sunrise, sunset, day length, and photoperiod-trigger flagging by latitude and date.

Light & photoperiod

DLC QPL Reference

DesignLights Consortium-listed grow lights. Verify rebate eligibility, PPE thresholds, and Premium-tier qualification.

Light & photoperiod

DLI Calculator

Daily Light Integral from PPFD and photoperiod. Per-cultivar reference targets included.

Light & photoperiod

Fixture Comparison

Compare grow lights — Fluence, Heliospectra, Gavita, ChilLED, HLG, Spider Farmer, HPS, CMH.

Light & photoperiod

Grow Light Studio

One fixture, one room — canopy PPFD, uniformity, DLI, crop fit, and energy cost together.

Light & photoperiod

Latitude Comparison

Compare daylight and DLI across two locations. How does light differ between Tucson and Stockholm?

Light & photoperiod

Photoperiod Trigger Calendar

When will photoperiod-sensitive cultivars trigger flowering at your latitude?

Light & photoperiod

Phytochrome State Calculator

Pfr/Ptotal from R:FR ratio. Spectrum design, EOD-FR planning, stretch management.

Light & photoperiod

PPFD from Distance

Estimate canopy PPFD from fixture spec and hang height — plan a grow space without buying a meter first.

Light & photoperiod

Solar Curve Visualizer

What the sun does, hour by hour, at any latitude on any date — solar elevation and clear-sky PPFD.

Light & photoperiod

Sunrise/Sunset Ramp

Smooth photoperiod transitions + optional EOD-FR pulse. Reduce stress, accelerate flowering.

Light & photoperiod

Air, climate & CO₂ 11

Air Exchange (ACH)

Air changes per hour from CFM and room volume. Fan and exhaust sizing for indoor spaces.

Air, climate & CO₂

Climate Zone Classifier

USDA hardiness, Köppen, and OAT cultivation zone — quick lookup for your location.

Air, climate & CO₂

CO₂ Enrichment

Greenhouse CO₂ injection rate, tank vs generator economics, safety thresholds, yield response.

Air, climate & CO₂

Dew Point Calculator

When and where condensation will form. Pair with VPD for night-setpoint planning.

Air, climate & CO₂

Environment Studio

Author the staged climate for your crop — air temp day/night, humidity, VPD, CO₂, airflow, plus root-zone temp, oxygen, and moisture — against your…

Air, climate & CO₂

Frost Cloth Selector

Row cover weight + frost protection + cost. Pest exclusion, frost extension, hardening-off.

Air, climate & CO₂

Frost Date Calculator

Average last spring and first fall frost dates by USDA hardiness zone or reference city.

Air, climate & CO₂

Frost Tolerance Reference

What dies tonight at 28°F? 50+ crops with kill temps + cover-or-harvest decision support.

Air, climate & CO₂

Growing Degree Days

Predict crop development and pest emergence from accumulated heat units. 25 crop and pest models built in.

Air, climate & CO₂

Shade Cloth Selector

What % shade for what crop. Climate-adjusted, with fabric specs and color guidance.

Air, climate & CO₂

VPD Calculator

Air and leaf vapor pressure deficit with per-stage target bands. The single most important environmental number.

Air, climate & CO₂

Water, nutrients & feed 13

Brix Refractometer Guide

Reference ranges per crop, how to read, what raises Brix. Plant health and harvest indicator.

Water, nutrients & feed

Compatibility Checker

Will these two compounds tank-mix safely? Quick pair-lookup against known incompatibilities.

Water, nutrients & feed

Compound Lookup

Look up any agronomic compound by CAS, formula, or name. Authoritative data from PubChem.

Water, nutrients & feed

Deficiency Symptom Guide

Diagnose nutrient deficiencies by location, color, and symptom. Returns ranked candidate diagnoses across 11 essential elements.

Water, nutrients & feed

Drip Irrigation Designer

Emitter type and spacing, run time, full BOM. Garden through orchard scale.

Water, nutrients & feed

EC / PPM Converter

Convert between EC, PPM-500 (US), and PPM-700 (EU) scales — plus crop reference targets.

Water, nutrients & feed

Foliar Spray Calculator

Foliar feeding rates for 12 nutrients/biostimulants. Tank mix, surfactant guidance, timing rules.

Water, nutrients & feed

Irrigation Schedule

Calculate gallons-per-week and frequency from crop, ET, soil. Compare drip/overhead/furrow efficiency.

Water, nutrients & feed

Nutrient Calculator

Build a recipe from raw compounds. See elemental ppm delivery with compatibility flagging.

Water, nutrients & feed

Nutrient Recipe Builder

Build a feed from salts or commercial products. Full elemental analysis vs your crop's targets, EC estimate, printable recipe sheet.

Water, nutrients & feed

Source Water Decoder

Paste your municipal report or well test. See what your starting water means for nutrient delivery and pH stability.

Water, nutrients & feed

Tank Mix Order Planner

What order to add fertilizers and amendments to your stock or batch tank. Avoid precipitation, lockout, and wasted nutrient.

Water, nutrients & feed

Tissue & Sap Test Reference

Interpret plant tissue analysis. Sufficiency ranges per element by crop, with deficiency symptoms.

Water, nutrients & feed

Substrate & soil 12

Amendment Calculator

Lime, sulfur, gypsum, and nutrient amendments. Per-acre and per-1000ft² rates with timing.

Substrate & soil

Compost C:N Calculator

Build a hot-compost pile with the right carbon-to-nitrogen ratio. 30+ feedstocks; live mix calculator.

Substrate & soil

Compost Pile Sizing

Pile dimensions, capacity, turning frequency. 6 methods from cold pile to commercial windrow.

Substrate & soil

Compost Tea Brewer

Aerated tea recipe + equipment + dilution from 5 to 500 gal. Vermicompost or thermophilic.

Substrate & soil

KNF Brew Calculator

Korean Natural Farming brews — FPJ, FFJ, OHN, IMO, LAB, WCA. Materials, times, dilutions.

Substrate & soil

Pot Size Calculator

Right-size your container. Crop + method + cycle length → recommended size.

Substrate & soil

Soil Moisture Tension

Read your tensiometer / Watermark sensor. Irrigate-now thresholds by 14 crops × soil texture.

Substrate & soil

Soil Test Report Reference

Read your soil test. pH, OM, CEC, base saturation, P, K, Ca, Mg, micronutrients — what to do at each range.

Substrate & soil

Soil Texture Triangle

USDA soil class from sand/silt/clay percentages, with management guidance per class.

Substrate & soil

Substrate Comparison

Compare growing media side-by-side: coco vs peat vs rockwool vs living soil vs hydroponic.

Substrate & soil

Substrate Lifecycle

Cost-over-time of single-use rockwool vs reusable coco vs living soil. Multi-cycle math.

Substrate & soil

Worm Castings Calculator

Bin sizing, worm population, feeding rate, harvest schedule. Red wigglers, ENC, ANC.

Substrate & soil

Structures, greenhouse & energy 19

Capacity Calculator

How many plants fit? Sq ft + cultivar + method → recommended count with spacing.

Structures, greenhouse & energy

Composting Toilet Designer

Off-grid sanitation that builds soil. Bucket through commercial-NSF systems. Pathogen die-off + legal status.

Structures, greenhouse & energy

Coverage Layout Designer

Plan grow room fixture layout. Visualize coverage and overlap with top-down room view.

Structures, greenhouse & energy

Greenhouse Cooling Load

Solar heat gain + outdoor + transpiration → BTU and fan CFM sizing for greenhouses.

Structures, greenhouse & energy

Greenhouse Energy Audit

12-item self-audit checklist + retrofit ROI. Compound-savings calculation.

Structures, greenhouse & energy

Greenhouse Heating Cost

Heat-loss BTU and annual fuel cost across 7 fuel types. Compare propane vs heat pump vs cordwood.

Structures, greenhouse & energy

Greenhouse Layout Designer

Beds, paths, headhouse. Top-down SVG view + utilization-rate calculation.

Structures, greenhouse & energy

Greenhouse Light Transmission

How much sunlight reaches your canopy after glazing, structure, age, and shade cloth losses?

Structures, greenhouse & energy

Greenhouse ROI Calculator

Should you build a greenhouse? Capital + opex vs revenue, payback, NPV, IRR. Honest projections.

Structures, greenhouse & energy

Greenhouse Vent Sizing

Natural vent area, exhaust fan CFM, intake shutters, and evap cooling pad sizing for any climate.

Structures, greenhouse & energy

Greywater System Designer

Household water reuse for landscape irrigation. Yield, basin sizing, soap chemistry, plant compatibility.

Structures, greenhouse & energy

Hoop House Designer

Low tunnel through NRCS-spec high tunnel. Snow load engineering + EQIP cost-share path.

Structures, greenhouse & energy

HVAC Cost Estimator

Lighting heat + transpiration → BTU load → kWh → monthly cost. Indoor cultivation reality check.

Structures, greenhouse & energy

Insulation R-Value

Stack up wall layers; calculate combined R + U. 21 materials from spray foam to greenhouse plastic.

Structures, greenhouse & energy

Multi-Zone Visualizer

See your whole facility at once — per-zone setpoints across 5 facility configurations.

Structures, greenhouse & energy

Passive Solar Greenhouse

Chinese-style + earth-bermed designs. Glazing angle, thermal mass, latitude-specific guidance.

Structures, greenhouse & energy

Pressure Cascade Designer

Negative-pressure airflow visualization for multi-zone facilities. Odor + pathogen control.

Structures, greenhouse & energy

Rainwater Catchment

Rainfall capture from your roof, monthly catchment vs demand, tank sizing, first-flush diverter sizing.

Structures, greenhouse & energy

Solar Pump Sizing

Off-grid water pumping. TDH math, pump type recommendation, panel + battery + tank sizing, full BOM.

Structures, greenhouse & energy

Field, beds & planting 14

Companion Planting Reference

What to plant together — and apart. 15 vegetables and herbs with mechanism-grounded recommendations.

Field, beds & planting

Cover Crop Selector

Match the cover crop to your goal — fix N, build OM, suppress weeds, biofumigate. 30+ species filtered.

Field, beds & planting

Field Border Designer

Riparian buffers, hedgerows, pollinator strips. USDA cost-share program guide (CRP, EQIP, CSP).

Field, beds & planting

Field Rotation Planner

Multi-year crop rotation for soil health and pest pressure reduction. 5 templates.

Field, beds & planting

Forest Garden Designer

7-layer perennial polyculture with regional plant recommendations and 10-year establishment timeline.

Field, beds & planting

Hugelkultur Designer

Wood-core mound design. Materials BOM, wood selection, 5-year planting plan.

Field, beds & planting

Mulch Calculator

Volume of mulch needed for any area + depth. Cost across 12 mulch types — wood chip, straw, compost, gravel.

Field, beds & planting

Orchard Tree Spacing

Trees per acre, pollination partners, training systems. 20 fruits + nuts; backyard through commercial.

Field, beds & planting

Plant Spacing Layout

Bed dimensions + crop + spacing method → plant count, top-down visual, yield. Row, square-foot, or bio-intensive.

Field, beds & planting

Seed Starting Calendar

When to start indoors, when to direct-sow, when to transplant — for 30+ vegetables based on your last frost date.

Field, beds & planting

Stagger Planner

Continuous-harvest scheduling across multiple grow rooms. Visualizes a year of staggered cycles.

Field, beds & planting

Tractor Implement Sizing

Match tractor PTO HP + 3-point hitch category to 14 common implements.

Field, beds & planting

Tree Pruning Calendar

When to prune what. 35+ species across fruit trees, ornamentals, shrubs, vines.

Field, beds & planting

Windbreak Designer

Multi-row shelterbelt design with regional species, 15H protection geometry, and establishment timeline.

Field, beds & planting

Crops & cultivars 5

Crop Risk Assessment

Self-score 12 risk dimensions (frost, drought, pest, market, labor). Surface what's likely to fail; pick mitigation.

Crops & cultivars

Cultivar Browser

40-cultivar searchable reference across cannabis, tomato, lettuce, mushroom, and more.

Crops & cultivars

Disease Resistance Lookup

Find resistant cultivars by crop and disease. Tomato VFN codes, downy mildew, late blight — decoded.

Crops & cultivars

Plant Recipe Browser

Community-shared cultivation recipes — cannabis, tomato, lettuce, mushroom, etc. Forkable, attributed.

Crops & cultivars

Yield Estimator

Crop + method + experience + count → realistic yield range. For planning, not guarantees.

Crops & cultivars

Specialty crops 6

Cut Flower Production

Stems-per-bed for 20 flower varieties. Sales channel pricing, post-harvest, vase life.

Specialty crops

Hop Trellis Planner

Design a hop yard. Trellis style, row spacing, plant count, materials BOM, expected yield over 3+ years.

Specialty crops

Maple Syrup Production

Sugarbush yield, evaporator boil time, BOM, and economics. 7 species + 4 evaporator tiers.

Specialty crops

Microgreens Production Math

Tray density, days to harvest, weight per tray, COGS, weekly + annual revenue for 23 varieties.

Specialty crops

Training Methods

Topping, FIM, LST, ScrOG, super-cropping, mainlining — when, how, what trade-offs.

Specialty crops

Trichome Maturity Guide

When to harvest cannabis. Trichome head color (clear/cloudy/amber) and effect-profile timing.

Specialty crops

Bees & pollinators 7

Apiary Site Survey

12-factor scoring for evaluating hive locations. Stack rank multiple sites; identify weakest factors.

Bees & pollinators

Bee Disease Reference

Diagnose hive problems by symptom or disease. Varroa, AFB, EFB, and 9 more — with treatment + reporting.

Bees & pollinators

Bee Forage Selector

Year-round nectar plants. 40+ species filtered by region, season, and pollinator type. Build a no-gap forage calendar.

Bees & pollinators

Beehive Yield Estimator

Honey + secondary product projection by region, management style, and experience. Realistic apiary economics.

Bees & pollinators

Beekeeping Calendar

Month-by-month hive management across 7 regions. Critical-task callouts.

Bees & pollinators

Pollination Service

Hives per acre by crop. Rental costs, native bee + mason bee + bumble alternatives.

Bees & pollinators

Pollinator Garden Designer

Continuous-bloom calendar across 5 seasons with regional natives and pollinator-targeted filtering.

Bees & pollinators

Livestock & pasture 9

Animal Birth Calendar

Gestation + incubation due dates for 23 species. Cattle, sheep, goats, poultry, exotics. With pre/post schedules.

Livestock & pasture

Brooder Calculator

Brooder space, heat, feed, water, and timeline for chicks, ducklings, poults, goslings, quail.

Livestock & pasture

Egg Production Estimator

Eggs per week + economics from a layer flock. 12 breeds, age curve, seasonal variation, feed-per-egg.

Livestock & pasture

Forage Quality Calculator

Read your hay analysis. RFV, TDN, animal-class adequacy from CP/ADF/NDF inputs.

Livestock & pasture

Goat Browse Reference

What goats eat — and don't. ~50 plants across favorites, invasive control, and lethal toxics.

Livestock & pasture

Heritage Breed Selector

~50 conservation-status livestock breeds filtered by species × purpose × climate × scale.

Livestock & pasture

Manure Management

Annual production, storage sizing, NPK content, application acres. CAFO threshold check.

Livestock & pasture

Pasture Forage Mix Builder

Grass + legume + forb mix tailored to region, livestock, and grazing intensity. Establishment cost included.

Livestock & pasture

Pasture Stocking Density

AU-based grazing capacity with rotational paddock math, recovery time, and continuous-vs-mob comparison.

Livestock & pasture

Mushrooms & aquaculture 5

Aquaculture Tank Calculator

RAS sizing — fish-only system. 10 species, biofilter, oxygen, pumps, heater/chiller, full BOM.

Mushrooms & aquaculture

Aquaponic Stocking Density

Balance fish biomass, grow bed area, and biofilter capacity. Tilapia, trout, perch, catfish.

Mushrooms & aquaculture

Grain Spawn Recipe

Mushroom grain spawn batches — rye, millet, wheat, popcorn — hydration, sterilization, transfer math.

Mushrooms & aquaculture

Mushroom Substrate Recipe

Build tested substrate for oyster, lion's mane, shiitake, king trumpet, reishi, and 5 more gourmet species.

Mushrooms & aquaculture

Mushroom Yield Estimator

Multi-flush yield by 10 species. Annual production from blocks/week, full P&L.

Mushrooms & aquaculture

Plant health & IPM 4

IPM Beneficial Selector

For each pest — spider mites, aphids, thrips, whitefly, fungus gnats, more — what predator or parasitoid actually works.

Plant health & IPM

Pathogen Pressure Forecast

Botrytis, powdery mildew, spider mites, Pythium — pressure index from your environmental conditions.

Plant health & IPM

Pest & Disease ID Guide

Identify 25+ pests and diseases — symptoms, where to find them, environmental drivers, and controls.

Plant health & IPM

Pesticide Spray Calculator

Tank mix amounts, unit conversions, calibration. Backpack through tractor sprayer.

Plant health & IPM

Post-harvest 3

Drying & Curing Schedule

Day-by-day RH and temp curve for proper dry / cure. Cannabis, hops, herbs, mushrooms.

Drying Yield Loss

Fresh-to-dry conversion for 17 crops. Moisture math, drying time, fresh-vs-dry revenue comparison.

Winter Storage Calculator

Plan to feed your household from your harvest. Per-crop targets, storage conditions, root cellar sizing.

Business, energy & compliance 10

Carbon Footprint Estimator

CO₂e per pound of harvested product. Energy + nutrients + transport + substrate broken down by source.

Business, energy & compliance

Compliance Readiness

Self-assess audit readiness for NOP, FSMA 204, METRC, GlobalG.A.P., Real Organic.

Business, energy & compliance

Cycle COGS Calculator

Per-cycle cost-of-goods-sold across inputs, energy, labor, water, and overhead. Reality-check your economics.

Business, energy & compliance

Hardware Build Recipes

DIY sensor builds. Walk-in cooler monitor, greenhouse multi-zone, beehive scale, more. Under $100 typical.

Business, energy & compliance

OMRI Status Lookup

Quick reference for USDA NOP organic compliance — fertilizers, amendments, pesticides, microbes.

Business, energy & compliance

PHI / REI Lookup

Pre-Harvest Interval and Re-Entry Interval for common pesticides — organic and conventional.

Business, energy & compliance

Sensor Comparison

Pick the right sensor — temp, humidity, CO₂, pH, EC, PAR. Spec, accuracy, OAT compatibility.

Business, energy & compliance

Which OAT Tier?

8-question self-assessment. Find the right tier — Library, Connect, Manage, Enterprise, Sovereign.

Business, energy & compliance

Worker Safety CO₂

Safe entry levels and purge time for CO₂-enriched grow rooms. OSHA limits + ventilation math.

Business, energy & compliance

Worker Safety Reference

OSHA + EPA WPS: pesticide PPE, heat illness, machinery, confined space, zoonosis, recordkeeping.

Business, energy & compliance