Calculates the focus points of an ellipse, essential for arch construction. Provides the necessary parameters for constructing an elliptical arch.
Start with your values, or try a preset.
Enter Arch Width (Horizontal Axis Length) and Arch Height (Vertical Axis Length) in the units shown.
Read Semi-Minor Axis (b), Semi-Major Axis (a), Focal Distance (c), Focus Point 2 (from left side), and Focus Point 1 (from left side) in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Arch Width (Horizontal Axis Length): 2 meters; Arch Height (Vertical Axis Length): 1 meters
Semi-Minor Axis (b): 1 meters; Semi-Major Axis (a): 1 meters; Focal Distance (c): 0 meters; Focus Point 2 (from left side): 1 meters; Focus Point 1 (from left side): 1 meters
Arch Width (Horizontal Axis Length): 4 meters; Arch Height (Vertical Axis Length): 1.5 meters
Semi-Minor Axis (b): 1.5 meters; Semi-Major Axis (a): 2 meters; Focal Distance (c): 1.322875656 meters; Focus Point 2 (from left side): 3.322875656 meters; Focus Point 1 (from left side): 0.6771243445 meters
Arch Width (Horizontal Axis Length): 6 meters; Arch Height (Vertical Axis Length): 1 meters
Semi-Minor Axis (b): 1 meters; Semi-Major Axis (a): 3 meters; Focal Distance (c): 2.828427125 meters; Focus Point 2 (from left side): 5.828427125 meters; Focus Point 1 (from left side): 0.1715728753 meters
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