Free Pot Size Calculator

Pick your plant and its size to get a sensible pot diameter.

Pot Rules of Thumb

Go only one size up from the current pot.
Terracotta breathes and suits succulents; plastic retains moisture for leafy plants.
Always use a pot with a drainage hole.

More Free Plant Tools

Try another calculator or identifier — no sign-up needed.

☀️ Free Tool

Plant Light Calculator

Match plants to your window direction and daily sunlight hours.

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💧 Free Tool

Watering Calculator

Get a custom watering schedule by plant type, pot size, and season.

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🔍 Free Tool

Pest & Problem Identifier

Pick the symptoms you see and get the likely culprit plus a fix.

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🌱 Free Tool

Fertilizer Dosage Calculator

Calculate how much and how often to feed your plants.

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🗓️ Free Tool

12-Week Care Schedule

Build a printable weekly care plan for any plant.

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💨 Free Tool

Plant Humidity Calculator

Find your plant's humidity target and easy ways to reach it.

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⚗️ Free Tool

Gritty Soil Mixer

Scale the perfect free-draining soil mix to the number of pots.

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🔄 Free Tool

Repot Timing Reminder

Enter your last repot date and learn the next window.

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🐾 Free Tool

Pet-Safety Checker

See whether a plant is safe around cats and dogs.

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💡 Free Tool

Grow Light Distance

Hang your grow light at the right height for healthy growth.

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🍂 Free Tool

Seasonal Care Checklist

A tailored to-do list for your plant this season.

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✂️ Free Tool

Propagation Picker

Find the best way to make more of your plant.

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🚰 Free Tool

Water Quality Guide

Know which water source is best for your plants.

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❄️ Free Tool

Overwintering Planner

A calm winter routine for tender and hardy plants.

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🛒 Free Tool

Plant Shopping Checklist

Inspect before you buy with this in-shop checklist.

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🔆 Free Tool

Sunburn vs Pest Checker

Tell scorched leaves apart from a pest problem.

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🌱 Free Tool

Root Health Checker

Read your roots after unpotting to catch rot early.

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📏 Free Tool

Window Light Estimator

Estimate the light level of any window direction.

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🤝 Free Tool

Care-Match Planter

Check whether two plants can share one pot happily.

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🪨 Free Tool

Repot Soil Volume

Estimate how much potting mix you need for a pot of any size.

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⚖️ Free Tool

Pot Weight Moisture Meter

Estimate how much water is left in the soil by comparing pot weights.

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🌤️ Free Tool

Sun Acclimation Planner

Build a safe day-by-day ramp when moving a plant into brighter light.

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💤 Free Tool

Dormancy Finder

Know when your plant is resting so you can stop overwatering it.

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📐 Free Tool

Grow Light PAR Estimator

Check the real light your plant gets from a grow light and set the right height.

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🌡️ Free Tool

Frost Risk Checker

See whether tonight's low will hurt your plant and what to do.

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