Houseplant Tools & Care Calculators
Precision care formulas backed by horticultural science. Calculate exact custom soil mix volumes, seasonal watering schedules, window foot-candles, grow light Daily Light Integrals (DLI), and triage yellow leaves with zero guesswork.
5 Connected Tools for Thriving Houseplants
Diagnose Distress
Yellow leaves, root rot, or pest triage
Calibrate Watering
Soil dry-down schedule & exact volume
Formulate Soil Mix
Custom chunky aroid & tropical recipe
Size Up Pot
Safe +1" to +2" container upsize
Optimize Light
Window direction & foot-candles
Houseplant Potting Soil Recipe Maker
Formulate custom aroid, tropical, and desert substrate blends. Calculates exact dry cups, quarts, and liters of orchid bark, pumice, coco coir, and worm castings tailored to your specific pot dimensions.
Watering & Soil Substrates
3 ToolsHouseplant Watering Calculator
Calculate customized watering schedules and precise volume based on pot, soil, light & season.
Stop guessing on a rigid calendar. Calculate estimated watering frequency, soil moisture depths, and water volumes tailored to your exact pot material, plant species, and room climate.
Houseplant Potting Soil Recipe Maker
Custom aroid, succulent, and tropical substrate recipe and volume batch calculator.
Our flagship potting mix calculator. Formulate custom aroid, tropical, and succulent soil blends and calculate exact ingredient volumes (cups, quarts, liters) for any pot size.
Houseplant Fertilizer Dilution Calculator
Calculate precise N-P-K dilutions (1/4, 1/2, full strength) without chemical root burn.
Calculate safe fertilizer dilution measurements in teaspoons, milliliters, or tablespoons per gallon or liter based on plant family and seasonal growth phases.
Lighting, Sun & Energy
2 ToolsHouseplant Light Calculator
Measure window direction, distance falloff, and foot-candles to find ideal placement.
Calculate natural light exposure, foot-candles, and lux based on window orientation, distance, and obstacles to ensure your plants never suffer from scorch or light starvation.
Grow Light & DLI Calculator
Calculate Daily Light Integral (DLI), PPFD, and photoperiod hours for houseplants.
Convert PPFD, distance, and timer hours into Daily Light Integral (DLI) to ensure your indoor plants receive sufficient photosynthetic energy year-round.
Diagnostics, Health & Safety
3 ToolsHouseplant Problem Diagnoser
Interactive multi-symptom triage for yellow leaves, root rot, brown tips & pests.
Answer guided symptom questions to generate ranked possible causes (overwatering, root rot, light stress, thrips, spider mites) with evidence-backed remedies.
Houseplant Humidity & VPD Calculator
Calculate Vapor Pressure Deficit (VPD) and ambient humidity deficits for tropicals.
Determine if your home humidity is causing crispy leaf tips or fungal stagnation. Get tailored humidity targets and room-by-room botanical styling advice.
Pet-Safe Houseplant Checker
Search ASPCA-verified toxicity data for cats and dogs with non-toxic alternatives.
Instantly check if a houseplant is toxic to cats or dogs. View active plant toxins, ingestion symptoms, veterinary first-aid, and certified non-toxic substitutes.
Growth, Matching & Repotting
2 ToolsRepotting & Pot Size Calculator
Determine when to repot, calculate safe new pot dimensions, and avoid overpotting.
Calculate safe pot diameter increases (+1 to +2 inches), delta soil volume, and rootbound urgency to prevent root rot from oversized containers.
Houseplant Finder & Matchmaker
Match your space, light, humidity, pets, and care habits with ideal houseplants.
Discover your botanical soulmates. Filter by window light, pet safety, watering discipline, and space size to get compatibility-ranked houseplant recommendations.
Why We Built the Ferny's Houseplant Tools Engine
Most houseplant advice online fails because it relies on rigid, static rules—like telling every grower to water once a week or to buy standard bagged potting soil. In reality, a Monstera in an unglazed terracotta pot basking in an East-facing California window transpires water four times faster than the same plant in a glazed ceramic container in a Chicago winter.
The Ferny's Houseplant Tools suite applies **deterministic botanical physics, environmental transpiration models, and University Extension research** to give you exact, personalized care parameters. Every tool is 100% free, runs instantly in your browser, and requires no account or email submission.
🌱 Scientifically Defensible
Formulas built around Daily Light Integrals (DLI), hydraulic soil conductivity, and ASPCA-verified veterinary toxicity data.
📐 Custom Pot Math
Calculate exact volume conversions (cups, quarts, liters) for cylinder, tapered, and bowl containers so you never overbuy substrate.
🩺 Zero Fake Precision
All tools emphasize physical verification (like the knuckle soil test) and provide actionable safety guardrails against overwatering and root rot.