80 free calculators for better growing

Smart Field Efficiency &
Plant Calculator Tools

Professional-grade calculators for soil volume, plant spacing, watering routines, timber value, and field coverage. Free to use, private, and built for real growing results.

80 calculators

Free gardening and land calculators

Each one answers a single question — how much soil, how many plants, how many trees, how many hours. Everything runs in your browser, with no sign-up.

All 80 calculators

Soil Calculator

Volume of soil, compost or mulch for beds and pots — plus how many bags that is.

Gives you cu yd · cu ft · bags

Plant Spacing Calculator

How many plants fit a bed at a given spacing, using square-foot gardening densities.

Gives you plants per bed · rows

Watering Schedule

How much water a planting needs each week, adjusted for plant type and season.

Gives you volume per week · frequency

Tree Spacing

Trees per acre for a given spacing, on square or triangular layouts.

Gives you trees per acre · row spacing

Black Walnut Value

Board-foot volume and rough timber value from trunk diameter and height.

Gives you board feet · value range

Acres Per Hour

Field capacity from implement width, ground speed and working efficiency.

Gives you acres/hour · hours per field

Land Clearing Cost

Per-acre clearing cost by terrain, tree density and hire vs. DIY.

Gives you cost per acre · total

Garden Cost Estimator

Setup and running cost for a new plot — beds, soil, plants and tools.

Gives you setup cost · annual cost

Also popular

From planning to planting

A better garden starts
with a good plan.

Turn a few measurements into a practical plan. Work out what to buy, where to plant, and how much to water before you get your hands in the soil.

Start with the soil

Find the volume your beds need and turn it into a practical bag count.
Give every plant its space

Work out how many plants fit, with room for healthy growth.
Make a watering plan

Estimate weekly water needs for your plants and the season.

Start planning your garden

A little planning. A lot more growing.From your first raised bed to your next growing season.

Method

How the numbers are worked out.

These are planning tools, so the method matters as much as the answer. Here is what sits behind each result.

Transparent formulas: Every result shows the equation and assumptions behind it. See how your measurements, spacing, or efficiency affect the answer.
Adjustable defaults: Plant and tree spacing starts with university extension guidance. Adjust those starting points to suit the space you’re growing in.
Estimates with context: Timber values and clearing costs depend on local conditions. Get a realistic range, with the factors that influence it.
Private by design: Calculations run on your own device. No measurements sent to a server, nothing stored, and no account to create.

For drainage, fertility, or a tree you intend to sell, a soil test or local assessment is the best next step after an estimate.

Answers

A few things
you might wonder.

A little clarity before you start. Here are the questions people ask most about using our calculators.

Still have a question?

We’re happy to help you find your next step.

Get in touch

Are these calculators free to use?

Yes. Every calculator on the site is free, with no sign-up, no trial period and nothing held back behind a paywall. The site is supported by advertising.

How much soil do I need for a raised bed?

Multiply length by width by depth in feet, then divide by 27 for cubic yards. A 4 ft × 8 ft bed filled 10 inches deep needs 26.7 cubic feet — just under a cubic yard. The Soil Calculator does this for you and converts it into bag counts.

Open the Soil Calculator

Do the calculators support metric units?

Many do. Where a tool accepts metric, the unit sits next to the field you type into — depths in centimetres or metres, areas in square metres or hectares, volumes in litres — so you can mix units and let the calculator convert. Tools built around Imperial-only conventions, such as board-foot timber rules, stay in Imperial because converting them would misrepresent the standard.

How accurate are the results?

The arithmetic is exact — accuracy depends on your measurements. For bulk materials like soil, compost and mulch, order 5 to 10 percent more than the calculated volume to allow for settling and spillage. For the cost tools, treat the output as a planning range rather than a quote, because local rates vary widely.

Do you store the measurements I type in?

No. Every calculation runs in JavaScript in your own browser. Your inputs are never sent to a server, never written to a database and never tied to an account, because there are no accounts.

Can I save or print a calculation?

There is no saved-results feature, since the site does not have accounts. Your browser's print or save-as-PDF command captures the result and the working alongside it, which is usually enough to take to a garden centre.