This should help you in the future if you want to figure it on your own?
First find your swept volume:
.7854 X BORE X BORE X STROKE X 16.39 = A
Measured Combustion Chamber Volume (cc's) = B
Measured Gasket Volume (cc's) = C
Figuring Gasket Volume: (.7854 X GSKT. BORE X GSKT. BORE X GSKT.
THICKNESS X 16.39 = C)
Measured deck clearance (cc's) = D
Figuring Deck Clearance: (.7854 X BORE X BORE X AMOUNT IN OR OUT OF THE HOLE X 16.39 = D) Note: Out of the hole is considered a negative (-) volume, meaning it subtracts volume from the cylinder like a dome piston would.
Measured Dome or Dish (cc's) = E
Again a dome piston is considered (-) volume, subtract dome volume from total swept volume.
A + B + C + D + (E +or-) = SWEPT VOLUME, DIVIDE SWEPT VOLUME BY: (B + C + D + (E +or-) = COMPRESSION RATIO
EXAMPLE: 355 SB Chevy .030" over (4.030" Bore X 3.480" Stroke)
64cc Chamber Dart Pro 1's
Fel-Pro 4.100" X .041" Head Gasket
.008" In the Hole
Wiseco Hollow Domes w/11.9cc Effective Dome
A = .7854 X 4.030 X 4.030 X 3.480 X 16.39 = 727.54
B = Combustion Chamber, measured: 64
C = Head Gasket .7854 X 4.100 X 4.100 X .041 X 16.39 = 8.87
D = Deck Clearance .7854 X 4.030 X 4.030 X .008 X 16.39 = 1.67
E = Piston Volume, measured: 11.9
"E" will be considered a subtraction from swept volume because it is a dome piston and it effectively takes volume away from the cylinder. If it was a dish piston it would effectively add volume so volume (E), would be added into swept volume.
(A)727.54 + (B)64 + (C)8.87 + (D)1.67 = 802.08
Subtract Volume (E): [802.08 - (E)11.9 = 790.18]
790.18 = Swept Volume
DIVIDED BY:
(B)64 + (C)8.87 + (D)1.67 = 74.54
Subtract Volume (E): [74.54 - 11.9 = 62.64]
62.64 = Clearance Volume/Unswept
790.18 DIVIDED BY 62.64 = 12.61:1 Static Compression Ratio
Looks complicated at first but if you walk yourself through it a couple of times you will find yourself using this math all the time, trust me you can do it, anyone can do it!