Grower's Toolkit

Cultivation is a practice of measurement. These tools translate the numbers your grow demands into decisions you can act on — phase by phase, medium by medium, without guesswork.

This toolkit grows alongside the VADEMECUM. New tools are added as the reference expands.

Universal Unit Converter

Conversion type

From

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Length, area, volume, weight, temperature, lighting intensity, EC to ppm — select a category, type a value in either field, convert instantly in both directions.

VPD Calculator

Temperature, humidity and growth phase in one simple reading.

°C °F

Growth phase Air temperature Relative humidity Leaf temp offset

Recommended RH range — —

Your current VPD — —

Select your growth phase, enter temperature and humidity — your VPD value and the recommended range appear instantly. Adjust until the numbers align with where your plants are.
Leaf offset is optional. Leave it at 0 if you only measure air temperature.

pH / EC Range Finder

Growth phase Growing medium

Recommended pH — —

Recommended EC — Measured in mS/cm

Choose your growth phase and growing medium — the recommended pH and EC targets appear for that specific combination. Use as a baseline; always verify against runoff readings.
These are practical target ranges for routine feeding and irrigation. Fine adjustments should always follow plant response and runoff readings.

Light / DLI Calculator

Estimate daily light integral from PPFD, photoperiod and growth phase.

Growth phase Actual PPFD Light hours / day Light type

Your DLI — —

Recommended PPFD — —

Starting distance — —

Enter your PPFD and light hours to calculate your Daily Light Integral. Compare against the recommended range for your current growth phase.
Use this as a practical starting guide. Final light distance should always be verified with plant response and, ideally, a PAR meter.

Irrigation / Runoff Guide

Watering rhythm, runoff and moisture targets by phase and growing medium.

Growth phase Growing medium

Watering frequency — —

Water volume — —

Runoff target — Measured as % runoff after irrigation

Select phase and medium to see watering frequency, volume and runoff targets. A starting point — your plants’ response is always the final authority.
Use this as a practical irrigation baseline. Final watering rhythm should always follow root health, container dryback and environmental demand.

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Topics

VPD, pH/EC range, DLI, PPFD, Irrigation, runnof, toolkit

Focus Keyword

cannabis grower calculators tools

Description

VPD, pH, EC, DLI, irrigation, unit conversion — interactive tools for cannabis growers. Built for precision, updated as the VADEMECUM grows.

Grower's Toolkit

Universal Unit Converter

VPD Calculator

pH / EC Range Finder

Light / DLI Calculator

Irrigation / Runoff Guide

Perscrutare

Grow smart, stay safe

Measurement conversion tables for growers

Nutrient management and fertiliser use

Cannabis chemistry

Troubleshooting guide