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How to Measure DBH for a London Tree Permit

DBH stands for Diameter at Breast Height. In London, Ontario, this single measurement determines if your tree is a protected "Distinctive Tree" (50cm+) or if it qualifies for the $1,000 preservation grant (40cm+).

Step-by-Step Tutorial:

1

Find the 1.4 Meter Mark

Measure exactly 1.4 meters (roughly 4.5 feet) from the ground up the trunk. This is the industry-standard "breast height."

2

Wrap Your Measuring Tape

Use a flexible measuring tape to wrap around the trunk at that 1.4m mark. Keep the tape level. This gives you the Circumference.

3

The Math (Or Use Our Tool)

To find DBH, divide your circumference by 3.14 (Pi). For example, a 126cm circumference divided by 3.14 equals a 40cm DBH—the minimum for the grant.

What if my tree is on a slope?

If the tree is growing on a slope, measure the 1.4m height from the uphill side of the tree.

Skip the Math - Use the Calculator

Simply input your raw circumference into our tool and we'll calculate your DBH and grant status instantly.

Launch DBH Tool

Next steps for DBH measurement

Related links

Use the DBH guide with the rebate and service pages so you can move from measurement to action with less guesswork.

Best next step $1,000 rebate guide

See how DBH connects to the cash-back reimbursement and the 40cm threshold.

Check rebate
Service Structural pruning service

Learn what to do once your tree is measured.

Neighborhood Old North neighborhood

Explore the areas where mature trees most often qualify.

Hub Open the tools hub

Jump back to the homepage tools section after you measure.

Check Your Grant Eligibility