Returns the frame width of a sprite
isFullScreen = false
vSync = true
winWidth = 640
winHeight = 480
canViewPortX = 0
canViewPortY = 0
OpenWindow("SpriteWidth", winWidth, winHeight, isFullScreen, vSync)
pCanvas = OpenCanvas(200, 80, 0, 0, 200, 80, 1) 'Need to open a canvas for drawing the text
sCanvas = OpenCanvasSpriteLayer(canViewPortX, canViewPortY, winWidth, winHeight)
Canvas(sCanvas)
DIM eye
DIM eyeW
DIM eyeH
DIM eSpriteWidth
DIM font1
Font1 = LoadFont("DripOctober.ttf", 16)
SetFont(Font1)
SetColor(RGB(100, 200, 200))
eye = LoadImage("theEye.png")
GetImageSize(eye, eyeW, eyeH)
eyeSprite = CreateSprite(eye, eyeW, eyeH)
SetSpritePosition(eyeSprite, 100, 100)
eSpriteWidth = SpriteWidth(eyeSprite)
While Not Key(K_ESCAPE)
Canvas(pCanvas) 'change to the standard drawing canvas for drawing text
DrawText("EyeSprite Width " + STR$(eSpriteWidth), 10, 30)
Update()
Wend

Link to Font (It's locally on your computer, your not downloading anything from the internet)
Related: SpriteHeight GetSpriteSize