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Compression
Ratio Calculator All
measurement are in inches with the exception of the "Head
cc's" and "Piston Notch or Dome cc's". If the piston has
a "Notch" or "Dished" top, enter the variable as a
positive number. If the piston has a "Dome", enter the
variable as a negative number (type a "-" sign in front of the
number). If the piston is a flat top enter the number zero (0).
Bore
Stroke
Head
cc's
Gasket
Thickness
Deck
Height
Piston
Notch [+] or Dome [-] cc's
1/8-MILE TO 1/4-MILE CONVERSION TABLE
1/8-mile ET
1/4-mile ET
1/8-mile ET
1/4-mile ET
1/8-mile ET
1/4-mile ET
1/8-mile ET
1/4-mile ET
5
7.80
6.8
10.61
8.55
13.34
10.3
16.07
5.05
7.88
6.85
10.69
8.6
13.42
10.35
16.15
5.1
7.96
6.9
10.76
8.65
13.49
10.4
16.22
5.15
8.03
6.95
10.84
8.7
13.57
10.45
16.30
5.2
8.11
7
10.92
8.75
13.65
10.5
16.38
5.25
8.19
7.05
11.00
8.8
13.73
10.55
16.46
5.3
8.27
7.1
11.08
8.85
13.81
10.6
16.54
5.35
8.35
7.15
11.15
8.9
13.88
10.65
16.61
5.4
8.42
7.2
11.23
8.95
13.96
10.7
16.69
5.45
8.50
7.25
11.31
9
14.04
10.75
16.77
5.5
8.58
7.3
11.39
9.05
14.12
10.8
16.85
5.55
8.66
7.35
11.47
9.1
14.20
10.85
16.93
5.6
8.74
7.4
11.54
9.15
14.27
10.9
17.00
5.65
8.81
7.45
11.62
9.2
14.35
10.95
17.08
5.7
8.89
7.5
11.70
9.25
14.43
11
17.16
5.75
8.97
7.55
11.78
9.3
14.51
11.05
17.24
5.8
9.05
7.6
11.86
9.35
14.59
11.1
17.32
5.85
9.13
7.65
11.93
9.4
14.66
11.15
17.39
5.9
9.20
7.7
12.01
9.45
14.74
11.2
17.47
5.95
9.28
7.75
12.09
9.5
14.82
11.25
17.55
6
9.36
7.8
12.17
9.55
14.90
11.3
17.63
6.05
9.44
7.85
12.25
9.6
14.98
11.35
17.71
6.1
9.52
7.9
12.32
9.65
15.05
11.4
17.78
6.15
9.59
7.95
12.40
9.7
15.13
11.45
17.86
6.2
9.67
8
12.48
9.75
15.21
11.5
17.94
6.25
9.75
8.05
12.56
9.8
15.29
11.55
18.02
6.3
9.83
8.1
12.64
9.85
15.37
11.6
18.10
6.35
9.91
8.15
12.71
9.9
15.44
11.65
18.17
6.4
9.98
8.2
12.79
9.95
15.52
11.7
18.25
6.45
10.06
8.25
12.87
10
15.60
11.75
18.33
6.5
10.14
8.3
12.95
10.05
15.68
11.8
18.41
6.55
10.22
8.35
13.03
10.1
15.76
11.85
18.49
6.6
10.30
8.4
13.10
10.15
15.83
11.9
18.56
6.65
10.37
8.45
13.18
10.2
15.91
11.95
18.64
6.7
10.45
8.5
13.26
10.25
15.99
12
18.72
6.75
10.53