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Calcimator

Shade Coverage Calculator

Calculate shadow area, cooling savings, and UV reduction from trees based on height and sun angle.

Inputs

ft
ft
deg
deg

Results

Total Shadow Area

4,205 sq ft

≈ 18 one-car garages

Shadow Length40 ft
Yard Coverage42.1%
Annual Cooling Savings$336.00
UV Reduction85%
How to Use This Calculator
  1. Enter Tree Height, Canopy Spread, and Sun Angle.
  2. Set Number of Trees and Latitude.
  3. Review the Total Shadow Area (sq ft) result.
  4. Use Shadow Length (ft) and Yard Coverage (%) to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Canopy Spread

Canopy SpreadTotal Shadow Area
151,652 sq ft
385,936 sq ft
6714,359 sq ft
9123,876 sq ft

What each input means

Tree Height
Height of the tree in feet.
Canopy Spread
Diameter of the tree canopy in feet.
Sun Angle
Sun altitude angle above horizon. Lower angle = longer shadow.
Number of Trees
Number of trees providing shade.
Latitude
Your approximate latitude (affects seasonal sun angles).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Tree Height = 40, Canopy Spread = 30, Sun Angle = 45, Number of Trees = 3 = 5 input(s) provided
  2. Calculate Total Shadow Area
    4205 = 4205
  3. Calculate Shadow Length
    Shadow Length
    40 = 40
  4. Calculate Yard Coverage
    Yard Coverage
    42.1 = 42.1

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