Smart plant tools

Care Calculators for Better Plant Decisions

Use lightweight calculators for watering, fertilizer dosage, potting mix, sunlight, humidity, growth planning, and seasonal plant care.

Tools
25
Inputs
Labeled
Result
Instant

Recommended first

General

Plant Watering Calculator

Calculate the correct watering frequency for your plant based on species, pot size, soil type, season, and climate.

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All Watering Soil Fertilizer Sunlight Growth Pests

Showing 25 calculation tools

All Plant Care Calculators

Aquarium plant fertilizer dosage calculator interface with tank volume and dosing strategy inputs AQUARIUM PLANTS

Aquarium Fertilizer Calculator

Calculate exact macro and micro fertilizer doses for your planted aquarium based on tank volume, plant density, CO2 system, and dosing strategy.

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Bioactive Substrate Calculator interface BIOACTIVE

Bioactive Substrate Calculator

Calculate bioactive substrate and optional drainage-layer volumes, then break the substrate into recipe components in Liters or US gallons.

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Handheld TDS pen meter reading low ppm in a glass of RO water beside a Cape sundew and a Nepenthes pitcher plant CARNIVOROUS

Carnivorous Plant Water TDS Calculator

Rate your water's TDS for carnivorous plants, calculate how much tap water can be blended with RO or distilled water to reach a safe target, and estimate how fast minerals build up in a pot.

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Close up of hands holding dark, crumbly compost LANDSCAPING

Compost Calculator

Get the perfect compost volume for your garden in seconds. No more excess bags or weak amendments – tailored for your soil type (sand, clay, loam).

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Fertilizer Calculator interface showing structured plant-care inputs and results FERTILIZER

Plant Fertilizer Calculator

Calculate the exact fertilizer dose and feeding schedule for your plant based on species, pot size, growth stage, and season.

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Grow Bag Sizing Calculator interface showing structured plant-care inputs and results GENERAL

Grow Bag Size Calculator

Find the perfect grow bag size for your plant based on root depth, plant type, and expected mature size.

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Growth Timeline Calculator interface showing structured plant-care inputs and results FERTILIZER

Plant Growth Calculator

Predict your plant's growth milestones and generate a personalized care calendar based on species, climate, and current conditions.

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Heat Stress Diagnosis Calculator screen with climate inputs and diagnostic recommendations CLIMATE CARE

Will Heat-Stressed Plants Recover? Diagnosis & Calculator

Diagnose plant heat stress risk from your temperature, humidity, sunlight exposure, and symptoms — then get specific watering, shade, and airflow actions.

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Humidity Calculator interface showing structured plant-care inputs and results WATERING

Plant Humidity Calculator

Assess your home's current humidity and get specific improvement recommendations for tropical houseplants like Calatheas, Orchids, and Ferns.

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Isopod Substrate & Leaf Litter Calculator tool thumbnail BIOACTIVE

Isopod Substrate & Leaf Litter Calculator

Calculate exact volumes of decayed white wood, flake soil, leaf litter, worm castings, and calcium for any isopod terrarium volume or container dimensions.

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Wheelbarrow full of wood chip mulch in a garden LANDSCAPING

Mulch Calculator

Know exactly how many bags or cubic yards of mulch to buy. Save money and time with precise calculations for any garden shape.

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Neem Oil Spray Calculator interface showing structured plant-care inputs and results GENERAL

Neem Oil Spray Calculator

Calculate the correct neem oil dilution ratio for your spray bottle size, plant type, and pest severity — safely and without burning leaves.

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NPK Fertilizer Calculator interface FERTILIZER

NPK Fertilizer Calculator for Houseplants & Containers (Not Farms)

Calculate fertilizer dosage and dilution for watering cans, containers, houseplants, and small growing spaces using the fertilizer label or a target nitrogen concentration — built for pots, not fields.

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Cross-section of a paludarium showing land zone, false bottom void, open water and hardscape PALUDARIUM

Paludarium Water Volume & Land Ratio Calculator

Calculate net paludarium water volume, land and water surface areas, false bottom void capacity, and minimum pump flow in metric or imperial units.

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Paludarium Water Volume Calculator tool thumbnail TOOL

Paludarium Water Volume Calculator

Calculate the gross aquatic zone volume and estimate net usable water volume of a paludarium in gallons and liters. Deduct foundation and hardscape displacement.

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Plant Pet Safety Calculator interface GENERAL

Plant Pet Safety Calculator

Check whether a plant is safe or potentially harmful to cats and dogs.

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Plant Spacing & Garden Density Calculator tool thumbnail TOOL

Plant Spacing & Garden Density Calculator

Calculate how many plants fit in your vegetable garden. Includes standard row spacing and square-foot density (SFG) for 35 common crops.

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Potting Mix Ratio Calculator interface showing structured plant-care inputs and results GENERAL

Potting Mix Calculator

Calculate the ideal potting mix ratios for any plant type — from moisture-loving tropicals to drought-tolerant succulents.

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Repotting Calculator interface showing structured plant-care inputs and results SOIL

Repotting Calculator

Find out if your plant needs repotting now and get the correct new pot size based on species, current pot size, and root health indicators.

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Self-watering plant pot with Pon mineral substrate showing pumice, zeolite and lava rock SOIL

Semi-Hydro Pon Volume & Mineral Split Calculator

Calculate net Pon volume, root displacement, DIY mineral components (pumice, zeolite, lava rock), dry weight, and water reservoir depth in metric or imperial units.

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Close up of a soil pH probe inserted into garden soil SOIL CARE

Soil pH Calculator

Know exactly how much lime or elemental sulphur you need to reach your target soil pH. No more over‑application or wasted amendments.

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Planting and Sowing Calendar interface showing climate zone inputs and harvest results GENERAL

Sowing Calendar

Find the best indoor and outdoor sowing dates for vegetables, herbs, and flowers based on your USDA Hardiness Zone and local frost dates.

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Sunlight Calculator interface showing structured plant-care inputs and results SUNLIGHT

Plant Light Calculator

Determine the ideal indoor light placement for your plant based on species, window direction, and seasonal light availability.

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Measuring scoops of aquasoil, akadama and coir beside a finished wabi-kusa ball on a tray AQUASCAPING

Wabi-Kusa Substrate Calculator

Calculate exact volume ratios of aquasoil, akadama, coir, and bentonite clay for any wabi-kusa ball diameter, plus sphagnum wrap surface area.

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Watering Calculator interface showing structured plant-care inputs and results GENERAL

Plant Watering Calculator

Calculate the correct watering frequency for your plant based on species, pot size, soil type, season, and climate.

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