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Balcony & Small-Space Gardens Calculators

Small spaces leave no room for guesswork. These tools tell you how many plants fit, how much potting mix to buy and what the layout looks like before you fill a single pot.

Woman tending potted plants on a small balcony
Small space

Vertical Garden Pocket & Soil Calculator

Pocket count, plants and how much potting mix a vertical planter needs.

Gives youpockets · plants · soil · bagsSmall space

Window Box Planting Calculator

How many plants fit your window box, with a top-down layout and soil volume.

Gives youplants · layout · soil · bagsSmall space

Balcony Container Layout Calculator

How many pots fit your balcony while keeping a clear walkway, with a top-down plan.

Gives youpots · layout plan · growing area · mixSmall space

Grow Bag Soil Mix Calculator

How much soil mix to fill your grow bags, split into compost, base mix and aeration.

Gives youtotal mix · recipe split · bags to buySmall space

Hanging Basket Plant & Soil Calculator

Trailing and centre plants for any basket size, plus the compost to fill it.

Gives yourim plants · centre plants · compostSmall space

Houseplant Repotting Batch Calculator

Potting mix for a whole repotting day, allowing for the root balls you move across.

Gives youmix per size · total mix · bagsSmall space

Self-Watering Container Reservoir Calculator

Days between refills for a self-watering container, based on reservoir size and plant water use.

Gives youdays between refills · water useSmall space

Windowsill Herb Garden Planner

How many herb pots fit your windowsill, how much mix they need and which herbs suit your light.

Gives youpots · mix · herb suggestions

Which small space calculator do you need?

Every tool works in metric or imperial units, shows its formula and a worked example, and lets you edit the assumptions that vary from garden to garden. Results stay on your device; nothing you enter is stored.

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Woman holding an armful of white cut flowers outdoors

Cut Flowers & Bouquets

Plan stems, recipes and weekly bouquet production.

8 calculators →Woman tending potted plants on a small balcony

Balcony & Small-Space Gardens

Window boxes, vertical pockets and container layouts.

8 calculators →Hand holding three seedlings in biodegradable pots

Seed Starting & Propagation

Seed tape, shelf and tray planning for indoor starts.

10 calculators →Man building a timber garden structure

DIY Garden Projects

Cut lists and material counts for trellises, netting and edging.

12 calculators →Woman harvesting vegetables from a lush kitchen garden

Kitchen Garden & Harvest

Grow the right amount for your household, week by week.

10 calculators →Hands holding a handful of rich garden soil

Soil, Compost & Mulch

Volumes, bags and bulk loads for soil, compost and mulch.

10 calculators →Gardener kneeling to plant seedlings in a garden bed

Planting & Spacing

Plant counts, square foot grids and bed layouts.

11 calculators →Watering can sprinkling water over garden plants

Water & Irrigation

Rainwater, watering and irrigation planning.

13 calculators →Man mowing a green lawn beside a house

Lawn & Turf

Grass seed, sod and lawn care quantities.

3 calculators →Young plants growing in rich garden soil

Fertilizer & Soil Testing

Soil pH, lime, N-P-K, manure and soil tests made practical.

14 calculators →Greenhouse filled with green plants

Greenhouse, Indoor & Hydroponics

Heaters, grow lights, VPD and hydroponic systems.

8 calculators →Gloved hands planting a seedling in garden soil

Planting Dates & Climate

Frost dates, planting calendars, GDD and chill hours.

8 calculators →Rows of fruit trees in an orchard under a blue sky

Trees, Land & Costs

Tree spacing, age and value, plus project cost estimates.

9 calculators →