Estimated Distance
—
m
Known Object Height
cm
Camera Vertical FOV
Calculation Breakdown
PIXEL SPAN
—
IMAGE HEIGHT
—
REAL HEIGHT
170 cm
FOV
60°
UNCERTAINTY
±10%
d = (H_real × H_img) / (2 × H_px × tan(vFOV/2))
H_real = object real height (cm)
H_img = image pixel height
H_px = object pixel span
vFOV = vertical field of view
1
Start camera and point it at a known object
2
Drag the cyan line to the top and yellow line to the bottom of the object
3
Select the matching preset or enter the real height
4
Read the distance. Adjust FOV for your phone model for better accuracy