The Lambda Calculator

Enter a lambda value and click on the Calculate AFR button to find out what AFR that equates to for different fuels:


Lambda / AFR Table

As a quick reference, here are lambda values and their AFR equivalents for different fuels. This is handy to use when looking at a wideband display/gauge that displays a gas scale AFR or just for curiosity’s sake.

 

Lambda Gas AFR E85 AFR E100 AFR Methanol AFR Diesel AFR
0.50 7.35 4.88 4.49 3.23 7.25
0.51 7.50 4.98 4.58 3.29 7.40
0.52 7.64 5.08 4.67 3.36 7.54
0.53 7.79 5.17 4.76 3.42 7.69
0.54 7.94 5.27 4.85 3.49 7.83
0.55 8.09 5.37 4.94 3.55 7.98
0.56 8.23 5.47 5.03 3.62 8.12
0.57 8.38 5.56 5.12 3.68 8.27
0.58 8.53 5.66 5.21 3.74 8.41
0.59 8.67 5.76 5.30 3.81 8.56
0.60 8.82 5.86 5.39 3.87 8.70
0.61 8.97 5.95 5.48 3.94 8.85
0.62 9.11 6.05 5.57 4.00 8.99
0.63 9.26 6.15 5.66 4.07 9.14
0.64 9.41 6.25 5.75 4.13 9.28
0.65 9.56 6.34 5.84 4.20 9.43
0.66 9.70 6.44 5.93 4.26 9.57
0.67 9.85 6.54 6.02 4.33 9.72
0.68 10.00 6.64 6.11 4.39 9.86
0.69 10.14 6.73 6.20 4.46 10.01
0.70 10.29 6.83 6.29 4.52 10.15
0.71 10.44 6.93 6.38 4.58 10.30
0.72 10.58 7.03 6.47 4.65 10.44
0.73 10.73 7.12 6.56 4.71 10.59
0.74 10.88 7.22 6.65 4.78 10.73
0.75 11.03 7.32 6.74 4.84 10.88
0.76 11.17 7.42 6.83 4.91 11.02
0.77 11.32 7.52 6.92 4.97 11.17
0.78 11.47 7.61 7.01 5.04 11.31
0.79 11.61 7.71 7.10 5.10 11.46
0.80 11.76 7.81 7.19 5.17 11.60
0.81 11.91 7.91 7.27 5.23 11.75
0.82 12.05 8.00 7.36 5.29 11.89
0.83 12.20 8.10 7.45 5.36 12.04
0.84 12.35 8.20 7.54 5.42 12.18
0.85 12.50 8.30 7.63 5.49 12.33
0.86 12.64 8.39 7.72 5.55 12.47
0.87 12.79 8.49 7.81 5.62 12.62
0.88 12.94 8.59 7.90 5.68 12.76
0.89 13.08 8.69 7.99 5.75 12.91
0.90 13.23 8.78 8.08 5.81 13.05
0.91 13.38 8.88 8.17 5.88 13.20
0.92 13.52 8.98 8.26 5.94 13.34
0.93 13.67 9.08 8.35 6.00 13.49
0.94 13.82 9.17 8.44 6.07 13.63
0.95 13.97 9.27 8.53 6.13 13.78
0.96 14.11 9.37 8.62 6.20 13.92
0.97 14.26 9.47 8.71 6.26 14.07
0.98 14.41 9.56 8.80 6.33 14.21
0.99 14.55 9.66 8.89 6.39 14.36
1.00 14.70 9.76 8.98 6.46 14.50
1.01 14.85 9.86 9.07 6.52 14.65
1.02 14.99 9.96 9.16 6.59 14.79
1.03 15.14 10.05 9.25 6.65 14.94
1.04 15.29 10.15 9.34 6.71 15.08
1.05 15.44 10.25 9.43 6.78 15.23
1.06 15.58 10.35 9.52 6.84 15.37
1.07 15.73 10.44 9.61 6.91 15.52
1.08 15.88 10.54 9.70 6.97 15.66
1.09 16.02 10.64 9.79 7.04 15.81
1.10 16.17 10.74 9.88 7.10 15.95
1.11 16.32 10.83 9.97 7.17 16.10
1.12 16.46 10.93 10.06 7.23 16.24
1.13 16.61 11.03 10.15 7.30 16.39
1.14 16.76 11.13 10.24 7.36 16.53
1.15 16.91 11.22 10.33 7.43 16.68
1.16 17.05 11.32 10.42 7.49 16.82
1.17 17.20 11.42 10.51 7.55 16.97
1.18 17.35 11.52 10.60 7.62 17.11
1.19 17.49 11.61 10.69 7.68 17.26
1.20 17.64 11.71 10.78 7.75 17.40