Spoiler:
The original

The feat

The rowvid

The reason?

The HD version is easier to distinguish shit with better in general. So I'll be using the HD remaster from now on for FFX.

Spoiler:

Kimahri = 6 pixels

Fahrenheit = 422 pixels

Fahrenheit/Kimahri = 70.333

Kimahri = 2.04 meters (official height)

Fahrenheit = 143.48 meters

Hmm, not sure if the original was stretched or if the HD version has been compressed, but either or explains the difference in length I'd figure

Spoiler:

Fahrenheit = 250 pixels

Part = 223 pixels

Part/Fahrenheit = 0.892

Part = 127.984 meters

Spoiler:

Part = 106 pixels

Home Height = 515 pixels

Home Height/Part = 4.858

Home Height = 621.846 meters

Spoiler:

Fireball Diameter = Home Height * 2

If it wasn't clear, the fireball is omnidirectional, and even in the earliest frame has engulfed the entirety of Home's highest point.

Thus the radius is equal to the height of Home at a minimum.

Anyway...

Fireball Diameter = 182 pixels

Initial Total Diameter = 1161 pixels

Travel = 346 pixels

Sand Cloud Diameter = 33 pixels

Initial Total Diameter/Fireball Diameter = 6.379

Travel/Fireball Diameter = 1.901

Sand Cloud Diameter/Fireball Diameter = 0.181

Initial Total Diameter = 7,933.511 meters

Travel = 2,364.258 meters

Time Frame = 0.32 seconds

Expansion Speed = 7,388.306 m/s (also happens to be the speed of the Fahrenheit)

And the rest of the diameter?

Expansion Time = 13 seconds

Expansion Distance (Per Radius) = 96,047.978 meters

Total Distance Expanded = 192,095.956 meters

Now, that's just the total distance tacked onto the initial expansion diameter. Add that to the earlier figure I got to get...

Total Explosion Diameter = 200,029.467 meters

Now for some KE of the sand and surface area shit for a yield.

Sand Cloud Diameter = 225.108 meters

Volume = PIr^2*H

r = Sand Cloud Diameter/2

H = Circumference of Explosion

Circumference = PId

d = Total Explosion Diameter

Circumference of Explosion = 628,411.104 meters

Sand Cloud Volume = 25,010,109,360 m^3

Sand Cloud Density = ~30 kg/m^3 (justification found here. Look for the part where I get the KE of a sand storm.)

Sand Cloud Mass = 750,303,280,700 kilograms

KE = 0.5mv^2

m = Sand Cloud Mass

v = Expansion Speed

Energy of Sand Cloud = 20,478,427,180,000,000,000 joules

Surface Area Sphere = 4PIr^2

Explosion Surface Area = 125,700,738,200 m^2

Surface Area (Sand) = LW

L = Circumference of Explosion

W = Sand Cloud Diameter

Sand Surface Area = 141,460,366.8 m^2

Explosion/Sand Cloud = 888.593

Total Explosion Yield = 19,196,987,050,000,000,000,000 joules or 4.349 teratons

Final Tally

Fahrenheit Speed = 7,388.306 m/s

Total Explosion Yield = 4.349 teratons