null
AFR Table / Lambda Table

Posted by CMB on Nov 25th 2025

AFR Table / Lambda Table

AFR / Lambda Converter Calculator

Enter a value in either field to instantly convert between AFR and Lambda. Works for gasoline (stoich 14.7), E85 (stoich 9.8), and diesel (stoich 14.5).

Enter a value above to see the conversion
Quick Reference (Gasoline):
Rich: AFR 11.5 = Lambda 0.78 | Target WOT: AFR 12.5 = Lambda 0.85 | Stoich: AFR 14.7 = Lambda 1.00 | Lean cruise: AFR 15.5 = Lambda 1.05

Here’s a simple guide that shows lambda values and what they equal in AFR for different types of fuel. This is helpful when you’re looking at a wideband gauge that reads AFR in the regular “gas” scale.

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
!