Horticulture & Climate Calculators

Comprehensive tools for greenhouse lighting, irrigation, fertilizer planning, and environmental control. Values calculate instantly as you type. Progress is automatically saved.

☀️ Climate 💡 Light Sync 🌱 Garden & Fert 🐛 Pest & Survey 🔄 Quick Convert 🌡️ Heating & Vent 💧 Water & H₂O₂

Climate Calculators

Crop DLI ↔ PPFD Sync

Select a crop to load optimal targets, or type manually to sync DLI and PPFD bidirectionally.

Load Optimal Crop Target: Photoperiod (hrs):

PPFD (µmol/m²/s):

↔

DLI (mol/m²/day):

Vapor Pressure Deficit (VPD)

Instantly calculates VPD based on air temp, optional leaf temp, and humidity.

Temp Units:

°C °F

Press Units:

Air Temp:

Humidity (%):

Leaf Temp (optional):

Calculated VPD--

DLI for Electric Light

Compute the Daily Light Integral generated strictly from an artificial light's intensity.

Intensity (µmol/m²/s):

Photoperiod (hrs):

Generated DLI--

Estimate DLI from Sunlight

Estimate total daily DLI based on peak sunlight measurements taken at solar noon.

Light Units:

µmol/m²/s W/m² Lux FC

Peak sunlight level:

Sunrise (HHMM):

Sunset (HHMM):

Est. Peak DLI--

Graph: DLI vs Photoperiod

Visualize how Daily Light Integral scales with time. Hover over the graph for exact values.

PPFD Target (µmol/m²/s):

Light Conversion Tools

3-Way Light Sync

Type in any box below to instantly auto-convert to the other two measurements.

Illuminance (Lux): Illuminance (Foot-Candles): PAR (PPFD µmol/m²/s):

Assumes ≈ 54 Lux per 1 µmol/m²/s

Joules ↔ DLI Sync

Instantly convert daily accumulated radiation back and forth.

Accumulated Radiation (J/cm²):

↕

Daily Light Integral (mol/m²/day):

Micromoles ↔ Moles Sync

Instantly convert µmol to mol.

Micromoles (µmol):

↕

Moles (mol):

Lumens to PPF Converter

Convert lumens to PPF (µmol/s) based on the exact spectrum of the light source.

Lumens: Light Source Spectrum:

Estimated PPF--

Intensity to PAR (Transmission)

Convert external solar radiation (W/m²) to inside PAR factoring in greenhouse glazing.

Outside Rad. (W/m²):

Transmission (%):

Inside PAR--

SUM/DLI Converter (Transmission)

Convert outside radiation (J/cm²) to inside PAR (mol/m²/day) factoring in glazing.

Radiation (J/cm²):

Transmission (%):

Inside PAR DLI--

Garden & Fertilizer Calculators

Standard Bed Metrics

Calculate the surface area and soil volume of a garden bed across multiple units simultaneously.

Inches

Feet

Meters

Centimeters

Enter dimensions above--

Bed Dimension Scale Up

Scale up existing garden bed dimensions by a specific percentage.

Unit System:

Length:

Width:

Depth:

Scale Increase By (%):

New Dimensions--

Cost of Nutrient App. Rate

Determine the true cost of fertilizer based on bag price, area, and app rate.

Price / Bag ($):

Bag Size:

Unit:

Target Nutrient Proportion (%):

Target Area:

Area Unit:

App Rate:

Rate Unit:

Fertilizer Required--

Fertilizer Application Rates

Calculate total fertilizer weight needed from your desired rate and area.

Nutrient Proportion (%):

Desired Rate:

Rate Unit:

Area:

Area Unit:

Total Fertilizer--

PPM ↔ lb Nutrient Sync

Instantly convert parts per million (PPM) to pounds of nutrient (lb = ppm / 1200).

Parts Per Million (PPM):

↕

Pounds (lb):

Fertilizer Mixture / Pure N

Compute the amount of pure nutrient based on total weight and blend percentage.

Blend %:

Total Wgt:

Unit:

Pure Target Nutrient--

Fertilizer Total Weights

Find the exact weight of a pure nutrient inside a fertilizer bag, and its application rate per area.

Nutrient Proportion (%):

Fertilizer Weight:

Unit:

Target Area:

Area Unit:

Total Nutrient--

Fertilizer Value Base Calc

Calculate total fertilizer value (lb/area) from US Tons of Dry Matter.

Tons Dry Matter:

Fertilizer %:

Area:

Area Unit:

Base Value per Area--

Fertilizer Value Adjustment

Increase a base fertilizer percentage by a specific % to recalculate the area value.

Base Tons:

Base %:

Increase By (%):

Area:

Area Unit:

Adjusted Value--

lb Nutrient per Volume

Multiply nutrient amount by liquid volume to obtain total nutrient mass.

Amount:

Unit:

Volume:

Vol Unit:

Total Mass--

Nutrient Weights (Base Weight)

Compute pure nutrient weight from a given base fertilizer weight and %.

Nutrient Proportion (%):

Base Weight:

Unit:

Pure Nutrient Output--

Nutrient Weights by Bag Size

Compute pure nutrient weight specifically from a standard bag size.

Nutrient Proportion (%):

Bag Size:

Unit:

Pure Nutrient Output--

Fertilizer Cost Per KG

Compute actual cost per unit of pure nutrient inside a bag.

Cost / Bag ($):

Nutrient (%):

Bag Size:

Unit:

Cost per kg Pure--

Plant Population

Calculate total plant count based on field area and planting density.

Area:

Unit:

Density:

Unit:

Total Population--

Pest & Survey Calculators

Degree-Days (GDD)

Select a specific mathematical model to calculate thermal heat units for pest/plant development.

Calculation Model:

Daily Max Temp:

Daily Min Temp:

Species Base Temp (Lower Threshold):

Degree-Days--

EIL & Threshold Graph

Calculate the Gain Threshold and Economic Injury Level (EIL break-even point). Customize units and threshold lines (GED/ET) below.

Area Unit:

Commodity Injured (%):

Control Cost ($/Area):

Crop Val ($/Area):

Market Val ($/Unit):

Current Pests/Area (N):

Custom Chart Thresholds (Visual Only):

Eq. Density (GED):

Eco. Threshold (ET):

Gain Threshold--

Disease Incidence & Density

Calculate root disease incidence (%) and standard pest/unit density.

Infected/Target Units:

Total Examined Units:

Survey Area (optional for density):

Incidence Rate--

NDVI (Vegetation Index)

Determine vegetation health using near-infrared (NIR) and visible (Vis) reflectance (0.0 to 1.0).

NIR Reflectance:

Vis Reflectance:

NDVI Ratio--

General Conversions

Interactive Converter Table

Type a number into any box to instantly convert between Imperial and Metric.

Acres	↔	Hectares
Cubic ft	↔	Cubic m
Cubic yd	↔	Cubic m
°F	↔	°C
Feet	↔	Metres
Imp Gal	↔	Litres
US Gal	↔	Litres
Quarts	↔	Litres
Pints	↔	Litres
Fl. oz	↔	mL
Inches	↔	cm
Ounces	↔	Grams
Pounds	↔	kg
Short Tons	↔	Metric Tons
Sq. Feet	↔	Sq. m
Yards	↔	Metres

Reference Conversion Table

A quick static reference chart for common factors.

Category	Imperial	Factor	Metric
Area	acres	0.404686	hectares
Area	sq ft	0.092903	sq metres
Length	feet	0.3048	metres
Length	inches	2.54	centimetres
Length	yards	0.9144	metres
Length	miles	1.60934	kilometres
Volume	cu ft	0.0283168	cubic metres
Volume	cu in	16.387	cubic cm
Volume	cu yds	0.764555	cubic metres
Volume	fl oz	28.4131	millilitres
Volume	pints	0.473176	litres
Volume	quarts	0.946353	litres
Volume	Imp gal	4.54609	litres
Volume	US gal	3.78541	litres
Weight	pounds	0.453592	kilograms
Weight	ounces	28.3495	grams
Weight	short tons	0.907185	metric tons
Power	horsepower	0.7457	kW

Application Rate Converter

Convert fertilizer, pesticide, or seed application rates between any imperial and metric units.

Given Rate:

Convert To:

Converted Rate--

Heating & Ventilation

Glazing Material Heat Loss

Calculate the hourly heat loss (BTUH) escaping specifically through glazing materials.

Area:

Unit:

Glazing U-Value:

Inside (°F/°C):

Outside (°F/°C):

Temp Unit:

Hourly Glazing Loss--

Total Greenhouse Heat Needs

Determine the required heater size (BTU) based on greenhouse dimensions and temp targets.

Width:

Length:

Dim Unit:

Inside Temp:

Outside Temp:

Temp Unit: Avg. Structure U-Value:

Heater Size Required--

Greenhouse Vent Needs

Calculate the fan ventilation requirement (cfm) based on floor area.

Length:

Width:

Dim Unit:

CFM per Unit:

Area Unit:

Min Ventilation Needed--

Water & H₂O₂ Tools

H₂O₂ Dilution Calculator

Enter water volume, H₂O₂ strength, and use case to generate precise application amounts.

Water Vol:

Unit:

H₂O₂ Strength (%): Target Use Case:

H₂O₂ Required--

Annual Water Storage

Calculate how many days your reservoir will last based on total capacity and daily usage.

Total Capacity:

Capacity Unit:

Daily Usage Rate:

Usage Unit:

Estimated Capacity--

Irrigation Water Requirement

Calculate total daily water usage based on field area and water volume per square meter.

Field Area:

Unit:

Target Water Volume per m² (L):

Daily Water Target--