Hort. Calculators

Garden Bed & Plant Spacing

General Unit Conversions

Greenhouse & Environmental Control

Glazing Material Heat Loss Calculator	Greenhouse Heat Loss Calculator	Greenhouse Heat Needs Calculator
Greenhouse Ventilation Needs Calculator	VPD Calculator

Lighting & Photometry

Crop DLI ↔ PPFD Converter	DLI for Electric Light Calculator	Estimate DLI from Peak Sunlight Calculator	Graph: DLI vs Photoperiod
Intensity to PAR Converter	Joules/cm² to DLI Converter	Lux & Foot-Candle Conversions	Lumens to PPF Converter
Micromoles to Moles Converter	SUM/DLI Converter	Wavelength-Specific DLI Calculator

Nutrient & Fertilizer Calculations

Fertigation Calculator	Fertilizer Converter with Additional Nutrient	Fertilizer Cost Per KG Calculator	Fertilizer Mixture Calculator
Fertilizer Value Calculator	lb Nutrient per Volume Calculator	Nutrient Deficiency Guide	Nutrient Weights Calculator
Nutrient Weights with Bag Size Calculator	Fertilizer Total Weights Calculator	PPM to lb Nutrient Converter

Water & Irrigation Management

Annual Water Storage Calculator

Crop Kc & Root Depth Calculator

Hydrogen Peroxide Dilution Calculator

Irrigation Water Requirement Calculator

General Conversion Tools

Area

Description	Metric	Imperial
Hectares ↔ Acres	ha	ac
Square Metres ↔ Square Feet	m²	ft²

Length

Description	Metric	Imperial
Metres ↔ Feet	m	ft
Centimetres ↔ Inches	cm	in
Metres ↔ Yards	m	yd

Mass / Weight

Description	Metric	Imperial
Grams ↔ Ounces	g	oz
Kilograms ↔ Pounds	kg	lb
Metric Tons ↔ Short Tons	t	ton

Volume

Description	Metric	Imperial
Cubic Metres ↔ Cubic Feet	m³	ft³
Cubic Metres ↔ Cubic Yards	m³	yd³
Litres ↔ Gallons (Imperial)	L	gal
Litres ↔ Gallons	L	gal
Litres ↔ Pints	L	pt
Litres ↔ Quarts	L	qt

Power

Description	Metric	Imperial
Kilowatts ↔ Horsepower	kW	hp

Temperature

Description	Metric	Imperial
Celsius ↔ Fahrenheit	°C	°F

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Bed Dimension Increase Calculator

Bed Dimension Increase Calculator (Open/Close)

Enter current dimensions and % increase.

Unit System: Current Length: Current Width: Current Depth: Increase by (%):

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Plant Number Calculator

Plant Number Calculator (Open/Close)

Calculate total plants from field area and density.

Area Unit:

Field Area:

Density Unit:

Plant Density:

Total Plants:

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Standard Bed Size Calculator

Standard Bed Size Calculator (Open/Close)

Enter dimensions to calculate area and volume.

Inches

Length (in):

Width (in):

Depth (in):

Feet

Length (ft):

Width (ft):

Depth (ft):

Meters

Length (m):

Width (m):

Depth (m):

Centimeters

Length (cm):

Width (cm):

Depth (cm):

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Greenhouse Heat Needs Calculator

Greenhouse Heat Needs Calculator (Open/Close)

Determine required heating (BTU) based on greenhouse area and temperature difference.

Width Unit:

Greenhouse Width:

Length Unit:

Greenhouse Length:

Inside Temp Unit:

Inside Temp:

Outside Temp Unit:

Outside Temp:

U-Value:

Heat Needs: BTU

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Glazing Material Heat Loss Calculator

Glazing Material Heat Loss Calculator (Open/Close)

Calculate hourly heat loss through glazing materials (BTUH).

Area Unit:

Glazing Area:

U-Value:

Inside Temp Unit:

Inside Temp:

Outside Temp Unit:

Outside Temp:

Hourly Heat Loss: BTUH

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Greenhouse Ventilation Needs Calculator

Greenhouse Ventilation Needs Calculator (Open/Close)

Calculate the ventilation requirement (cfm) based on greenhouse dimensions.

Length Unit:

Greenhouse Length:

Width Unit:

Greenhouse Width:

CFM per Area Unit:

CFM per Unit Area:

Ventilation Needs:

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Fertigation Calculations

Fertigation Calculator

Drip Irrigation Calculation

Enter your fertilizer label (N–P–K format), injection ratio, stock volume, and target nutrient(s). Detailed calculation steps are shown below.

Basic Inputs

Fertilizer Label (N–P–K):
Injection Ratio (e.g., 100):
Stock Volume:

Target Nutrient Inputs

Use Multiple Nutrients

Target N (ppm): (Optional reverse below)
Fertilizer Used (lb):

Fertilizer Weight Calculator

Global Settings

Output Weight Unit: (Final weights will be in this unit.)
Target Unit for Nutrients: (1 mg/L ≅ 1 ppm)

Per-Cycle Fertilizer Mixing

Enter total flow and target nutrient levels, then list your fertilizer sources and assign which fertilizer supplies which nutrient. Detailed calculations for each assignment are shown below. This calculation uses the full composition of each assigned fertilizer.

Total Flow:
Target N (ppm):
Target P (ppm):
Target K (ppm):
Target Other (ppm): (Optional)

Fertilizer Sources

Name	N%	P₂O₅%	K₂O%	Action

Nutrient Summary

(Compares targets to sum of % from sources table.)

Nutrient Assignments

Assign a fertilizer source to meet each primary nutrient target. Use 'Additional' types if supplementing from multiple sources for the same nutrient.

Reverse Calculation (Optional)

Enter actual weights (kg) for each assignment row to compute the resulting nutrient levels (ppm).

Irrigation Cycle Calculation

Enter water per cycle, injector ratio, and stock solution volume to determine how many cycles your tank covers.

Water per Cycle:
Injector Ratio (e.g., 100 for 1:100):
Stock Solution Volume:

Reverse Irrigation Cycle Calculation (Optional)

Enter desired cycles to compute required stock volume.

Desired Cycles:

Full Stock Solution Calculation

Multiplies the per-cycle fertilizer amounts (calculated in "Per-Cycle Mixing") by the number of irrigation cycles (calculated in "Irrigation Cycle Calculation").

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Fertilizer Converter with Additional Nutrient

Fertilizer Converter (Open/Close)

Convert between oxide and elemental forms for N–P–K values, including optional additional nutrient (e.g., Ca, Mg, Fe).

Choose input label format:
Oxide form (N–P₂O₅–K₂O) Elemental form (N–P–K)

N (%):
P or P₂O₅ (%):
K or K₂O (%):

Other Nutrient: (%)

Converted Nutrient Values

N: –%

P (or P₂O₅): –%

K (or K₂O): –%

Other Nutrient: –%

Approximate in ppm

N: – ppm

P: – ppm

K: – ppm

Other Nutrient: – ppm

Conversion: 1% = 10,000 ppm (1 g per 100 g = 10,000 mg per 1,000,000 mg)

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Fertilizer Cost Per KG Calculator

Fertilizer Cost Per KG Calculator (Open/Close)

Compute cost per unit of nutrient in a bag.

Cost per Bag ($):

Bag Size Unit: Bag Size:

Nutrient Proportion (%):

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Nutrient Deficiency Guide

Nutrient Deficiency Guide (Open/Close)

Select a leaf position and a visible symptom to identify possible nutrient deficiencies based on field observations.

Select Leaf Position:

Select Symptom:

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Fertilizer Mixture Calculator

Fertilizer Mixture Calculator (Open/Close)

Compute pure nitrogen (N) using: Pure N = Weight × (Percent / 100).

Fertilizer %:

Weight Unit: Weight:

Result:

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Fertilizer Total Weights Calculator

Fertilizer Total Weights Calculator (Open/Close)

Calculate total nutrient weight from fertilizer weight and nutrient %.

Nutrient Proportion (%):

Fertilizer Weight Unit: Fertilizer Weight:

Area Unit:

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Fertilizer Value Calculator

Fertilizer Value Calculator (Open/Close)

Calculate fertilizer value (lb/acre) from US Tons of Dry Matter and Fertilizer %.

US Tons of Dry Matter:

Fertilizer %:

Area Unit:

Area:

Result:

Fertilizer Value Adjustment (Open/Close)

Increase the base fertilizer % by a specified percentage.

Base US Tons of Dry Matter:

Base Fertilizer %:

Increase by (%):

Area Unit:

Area:

Adjusted Result:

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lb Nutrient per Volume Calculator

lb Nutrient per Volume Calculator (Open/Close)

Multiply nutrient amount by volume to obtain total nutrient (in lb).

Unit: Amount:

Volume Unit: Volume:

Result:

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Nutrient Weights Calculator

Nutrient Weights Calculator (Open/Close)

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

Nutrient Proportion (%):

Base Weight Unit: Base Weight:

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Nutrient Weights with Bag Size Calculator

Nutrient Weights with Bag Size Calculator (Open/Close)

Calculate nutrient weight from bag size and nutrient %.

Bag Size Unit: Bag Size:

Nutrient Proportion (%):

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Nutrient Weights with Bag Size Calculator

Nutrient Weights with Bag Size Calculator (Open/Close)

Calculate nutrient weight from bag size and nutrient %.

Bag Size Unit: Bag Size:

Nutrient Proportion (%):

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PPM to lb Nutrient Converter

PPM to lb Nutrient Converter (Open/Close)

Convert parts per million (PPM) to lb nutrient using: lb = ppm / 1200.

PPM:

Result:

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Annual Water Storage Calculator

Annual Water Storage Calculator (Open/Close)

Calculate storage duration based on total capacity and daily usage.

Total Storage Capacity (m³): Days of Use:

Storage lasts for:

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Crop K<sub>c</sub> & Root Depth Calculator

Crop K_c & Root Depth Calculator

Crop K_c & Root Depth Calculator (Open/Close)

This tool provides each crop’s default rooting depth, availability coefficient, and monthly climate (crop) coefficients from the XML. Check “Override Default Root Depth” and/or “Override Monthly Coefficients” if local conditions differ.

Select Crop:

Override Default Root Depth

Effective Rooting Depth of Mature Crops:

Availability Coefficient:

Override Monthly Coefficients

May: June: July: August: September: Off Season:

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Hydrogen Peroxide Dilution Calculator

Hydrogen Peroxide Dilution Calculator (Open/Close)

Enter the water volume, select the unit, hydrogen peroxide strength, and use case.

Water Volume:
Unit:
Hydrogen Peroxide Strength (%):
Use Case:

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Irrigation Water Requirement Calculator

Irrigation Water Requirement Calculator (Open/Close)

Calculate daily water usage based on area and water volume per m².

Area Unit:

Field Area:

Water Volume per m² (L):

Daily Water Usage:

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Hort. Calculators

General Conversion Tools

Bed Dimension Increase Calculator

Plant Number Calculator

Standard Bed Size Calculator

Greenhouse Heat Needs Calculator

Glazing Material Heat Loss Calculator

Greenhouse Ventilation Needs Calculator

Crop DLI ↔ PPFD Converter

DLI for Electric Light Calculator

Estimate DLI from Peak Sunlight Calculator

Graph: DLI vs Photoperiod

Intensity to PAR Converter with Transmission

Joules/cm² to DLI Converter

Lumens to PPF Converter

Lux & Foot-Candle Conversions

Micromoles to Moles Converter

SUM/DLI Converter with Transmission

Wavelength-Specific DLI Calculator

Vapor Pressure Deficit (VPD) Calculator

Fertigation Calculator

Basic Inputs

Target Nutrient Inputs

Global Settings

Per-Cycle Fertilizer Mixing

Fertilizer Sources

Nutrient Summary

Nutrient Assignments

Reverse Calculation (Optional)

Irrigation Cycle Calculation

Reverse Irrigation Cycle Calculation (Optional)

Full Stock Solution Calculation

Fertilizer Converter with Additional Nutrient

Converted Nutrient Values

Approximate in ppm

Fertilizer Cost Per KG Calculator

Nutrient Deficiency Guide

Fertilizer Mixture Calculator

Fertilizer Total Weights Calculator

Fertilizer Value Calculator

lb Nutrient per Volume Calculator

Nutrient Weights Calculator

Nutrient Weights with Bag Size Calculator

Nutrient Weights with Bag Size Calculator

PPM to lb Nutrient Converter

Annual Water Storage Calculator

Crop Kc & Root Depth Calculator

Hydrogen Peroxide Dilution Calculator

Irrigation Water Requirement Calculator

Crop K_c & Root Depth Calculator