Farm & Garden · 20 free tools
Farm, Garden and Fencing Calculators
These calculators take a measured field or garden bed and turn it into materials. Start with the field area calculator if you still need the size, price the boundary with the fence length calculator and the fence post count calculator, then move on to seed, soil and irrigation once the ground is defined.
The arithmetic here is mostly multiplication, and that is exactly where the mistakes happen: mixing acres with hectares, applying a per-square-metre rate to a per-square-foot plan, or buying for the net planted area while fencing the gross boundary. Each page shows the unit it expects and the formula it applies, so a result can be checked by hand rather than trusted blindly. Coverage figures for irrigation and sprinklers are spacing calculations, not pressure calculations — pipe diameter, flow rate and pressure loss belong to a proper irrigation design.
Area measurement itself lives in the area and acreage hub, including polygon tracing and unit conversion. For layout questions about rows and plant counts, the crop row length and plants-per-row tools complete the set.
Start with these
The three tools that answer the most common question in this cluster. Each page states its method, coverage and limits.
All farm & garden tools
Every tool in this cluster is linked from this page, so nothing here depends on a search box or a JavaScript menu to be reachable.
Fence Length Calculator
Calculate the perimeter and fence length for a rectangular plot.
WorldwideFence Post Count Calculator
Estimate fence posts needed from fence length and post spacing.
WorldwideMulch Volume Calculator
Calculate mulch volume from coverage area and mulch depth.
WorldwideCrop Row Length Calculator
Estimate row count and total crop-row length from field dimensions and row spacing.
WorldwideFertilizer Amount Calculator
Estimate fertilizer quantity from field acreage and application rate.
WorldwideFertilizer by Area Calculator
Calculate fertilizer quantity from area and grams-per-square-metre application rate.
WorldwideField Coverage Time Calculator
Estimate hours required to cover a field from acreage and acres-per-hour rate.
WorldwideGarden Bed Area Calculator
Calculate rectangular garden bed area and perimeter.
WorldwideGrazing Stock Density Calculator
Calculate animals per acre and acres available per animal.
WorldwideIrrigation Coverage Calculator
Calculate ideal circular sprinkler coverage from spray radius.
WorldwideIrrigation Flow Volume Calculator
Calculate water volume delivered from flow rate and run time.
WorldwideIrrigation Water Depth Calculator
Convert irrigation volume over an area into equivalent millimetres of water depth.
WorldwideMowing Time Calculator
Estimate mowing time from lawn area and effective mowing rate.
WorldwideMulch Volume by Area Calculator
Estimate mulch volume from area and mulch depth.
WorldwidePlants Per Field Calculator
Estimate total plant positions from field dimensions, row spacing and plant spacing.
WorldwidePlants Per Row Calculator
Estimate how many plants fit along a row from row length and plant spacing.
WorldwideRows Per Field Calculator
Estimate the number of crop rows that fit across a field width.
WorldwideSeed Quantity Per Acre Calculator
Estimate total seed required from acreage and a seeding rate.
WorldwideSoil Volume Calculator
Calculate soil or topsoil volume from area and fill depth.
WorldwideSprinkler Count Calculator
Estimate the number of sprinklers needed for a field using radius and overlap allowance.
WorldwideLearn more about farm & garden
Guides explain the method behind these numbers, the cases where it misleads, and how to choose between two tools that look interchangeable.
You may also need
These clusters answer the questions that usually follow a farm and garden calculators result.
Best-of lists in this cluster
- Best Free Land Measurement Tools
Measure the boundary, convert the units, then check the number against the deed before you use it for anything that costs money.
About this hub
20 tools are grouped here because they answer the same family of questions. Every result is produced in your browser from the method stated on its own page; for legal, surveying, safety-critical or regulated decisions, verify the answer with the responsible authority.