How to Measure Your Lawn or Garden Area in Square Metres

1. Draw the area you will actually treat

Take a long tape measure or measuring wheel, paper and a pencil. Sketch the lawn edge, beds, paths and other fixed features. It does not need to be a scale drawing.

• Keep zones separate: front lawn, back lawn and garden beds can each have their own total.
• Leave out hard surfaces: do not count the house, paving or driveway in the treatment area.
• Label each section: A, B and C are enough. Avoid counting an overlapping piece twice.

For a lawn-only application, exclude garden beds. Measure beds separately if you also plan to treat them. The Maryland lawn guide explains why the treated lawn area matters rather than the property size.

2. Measure simple shapes

A triangle’s height is measured at a right angle to its base, not along the sloping edge. A circle’s radius is half its diameter. For a semicircle, halve the circle’s area.

These formulas work in metres just as they do in feet. See Iowa State’s shape-by-shape measuring guide.

3. Add the sections and subtract exclusions

Here is a worked example: a 12 m × 8 m rectangle with an attached triangular lawn section. The triangle does not overlap the rectangle. A 1 m × 8 m paved path sits inside the rectangle.

The treatment area is 94 m². Subtract the path only because it was included in the original rectangle. If your measurements already go around it, do not subtract it again.

4. Deal with curves and awkward edges

Split an L-shaped lawn into two rectangles. Break a curved outline into smaller manageable sections and record the total as an estimate. Smaller sections help you follow the boundary more closely.

For a heavily curved bed, Iowa State’s guide also shows an offset method using equally spaced width measurements. Use that rather than assuming the whole space is one rectangle.

A tape or wheel gives you on-site measurements to check your sketch. University of Minnesota’s lawn-measuring guide compares physical measurements with online estimates.

5. Save the number before you mix

Use that area with the current directions for your exact product and formulation. Do not add a turf-ordering “wastage allowance” to the treatment area. Extra product is not a substitute for accurate measurement.

Area and dilution are different. The ground area helps determine the amount of product. The mixing directions determine how it is diluted. A bottle size or sprayer setting does not, by itself, establish how much ground you should cover.

Next, follow the relevant LIQUID BIOCHAR application guide or SAND FIXER guide. Check the current label and whether you have retail or PRO before calculating a dose.

Common questions