Photon energy

The energy of a photon is:

$E_{\mathrm {photon} }={\frac {hc}{\lambda }}$

Where h is the Planck constant, and c is the speed of light. Note that x-ray energies are usually reported in electron-volts (1 J = 6.2415096471204×¹⁵ keV).

Lookup tables

Far Infrared

E	λ		E	λ		E	λ		E	λ		E	λ
1.24 meV	999.873 µm		1.96 meV	634.075 µm		3.08 meV	402.102 µm		4.86 meV	254.996 µm		7.67 meV	161.707 µm
1.26 meV	980.267 µm		1.99 meV	621.642 µm		3.15 meV	394.218 µm		4.96 meV	249.996 µm		7.82 meV	158.536 µm
1.29 meV	961.046 µm		2.03 meV	609.453 µm		3.21 meV	386.488 µm		5.06 meV	245.094 µm		7.98 meV	155.428 µm
1.32 meV	942.202 µm		2.08 meV	597.503 µm		3.27 meV	378.910 µm		5.16 meV	240.288 µm		8.14 meV	152.380 µm
1.34 meV	923.728 µm		2.12 meV	585.787 µm		3.34 meV	371.481 µm		5.26 meV	235.577 µm		8.30 meV	149.392 µm
1.37 meV	905.615 µm		2.16 meV	574.301 µm		3.40 meV	364.197 µm		5.37 meV	230.957 µm		8.47 meV	146.463 µm
1.40 meV	887.858 µm		2.20 meV	563.041 µm		3.47 meV	357.055 µm		5.48 meV	226.429 µm		8.63 meV	143.591 µm
1.42 meV	870.449 µm		2.25 meV	552.001 µm		3.54 meV	350.054 µm		5.59 meV	221.989 µm		8.81 meV	140.776 µm
1.45 meV	853.382 µm		2.29 meV	541.177 µm		3.61 meV	343.191 µm		5.70 meV	217.636 µm		8.98 meV	138.015 µm
1.48 meV	836.649 µm		2.34 meV	530.566 µm		3.68 meV	336.461 µm		5.81 meV	213.369 µm		9.16 meV	135.309 µm
1.51 meV	820.244 µm		2.38 meV	520.162 µm		3.76 meV	329.864 µm		5.93 meV	209.185 µm		9.35 meV	132.656 µm
1.54 meV	804.161 µm		2.43 meV	509.963 µm		3.83 meV	323.396 µm		6.05 meV	205.084 µm		9.53 meV	130.055 µm
1.57 meV	788.393 µm		2.48 meV	499.964 µm		3.91 meV	317.055 µm		6.17 meV	201.062 µm		9.72 meV	127.505 µm
1.60 meV	772.934 µm		2.53 meV	490.161 µm		3.99 meV	310.838 µm		6.29 meV	197.120 µm		9.92 meV	125.005 µm
1.64 meV	757.778 µm		2.58 meV	480.550 µm		4.07 meV	304.743 µm		6.42 meV	193.255 µm		10.12 meV	122.554 µm
1.67 meV	742.920 µm		2.63 meV	471.127 µm		4.15 meV	298.768 µm		6.54 meV	189.466 µm		10.32 meV	120.151 µm
1.70 meV	728.353 µm		2.68 meV	461.889 µm		4.23 meV	292.910 µm		6.67 meV	185.751 µm		10.53 meV	117.795 µm
1.74 meV	714.072 µm		2.74 meV	452.833 µm		4.32 meV	287.167 µm		6.81 meV	182.108 µm		10.74 meV	115.485 µm
1.77 meV	700.070 µm		2.79 meV	443.954 µm		4.40 meV	281.536 µm		6.94 meV	178.538 µm		10.95 meV	113.221 µm
1.81 meV	686.343 µm		2.85 meV	435.249 µm		4.49 meV	276.016 µm		7.08 meV	175.037 µm		11.17 meV	111.001 µm
1.84 meV	672.886 µm		2.91 meV	426.714 µm		4.58 meV	270.603 µm		7.22 meV	171.605 µm		11.39 meV	108.824 µm
1.88 meV	659.692 µm		2.96 meV	418.347 µm		4.67 meV	265.297 µm		7.37 meV	168.240 µm		11.62 meV	106.690 µm
1.92 meV	646.757 µm		3.02 meV	410.145 µm		4.77 meV	260.096 µm		7.52 meV	164.941 µm		11.85 meV	104.598 µm

Mid Infrared

E	λ		E	λ		E	λ		E	λ		E	λ
12.40 meV	99.987 µm		19.55 meV	63.408 µm		30.83 meV	40.210 µm		48.62 meV	25.500 µm		76.67 meV	16.171 µm
12.65 meV	98.027 µm		19.94 meV	62.164 µm		31.45 meV	39.422 µm		49.59 meV	25.000 µm		78.21 meV	15.854 µm
12.90 meV	96.105 µm		20.34 meV	60.945 µm		32.08 meV	38.649 µm		50.59 meV	24.509 µm		79.77 meV	15.543 µm
13.16 meV	94.220 µm		20.75 meV	59.750 µm		32.72 meV	37.891 µm		51.60 meV	24.029 µm		81.37 meV	15.238 µm
13.42 meV	92.373 µm		21.17 meV	58.579 µm		33.38 meV	37.148 µm		52.63 meV	23.558 µm		82.99 meV	14.939 µm
13.69 meV	90.562 µm		21.59 meV	57.430 µm		34.04 meV	36.420 µm		53.68 meV	23.096 µm		84.65 meV	14.646 µm
13.96 meV	88.786 µm		22.02 meV	56.304 µm		34.72 meV	35.706 µm		54.76 meV	22.643 µm		86.35 meV	14.359 µm
14.24 meV	87.045 µm		22.46 meV	55.200 µm		35.42 meV	35.005 µm		55.85 meV	22.199 µm		88.07 meV	14.078 µm
14.53 meV	85.338 µm		22.91 meV	54.118 µm		36.13 meV	34.319 µm		56.97 meV	21.764 µm		89.83 meV	13.802 µm
14.82 meV	83.665 µm		23.37 meV	53.057 µm		36.85 meV	33.646 µm		58.11 meV	21.337 µm		91.63 meV	13.531 µm
15.12 meV	82.024 µm		23.84 meV	52.016 µm		37.59 meV	32.986 µm		59.27 meV	20.919 µm		93.46 meV	13.266 µm
15.42 meV	80.416 µm		24.31 meV	50.996 µm		38.34 meV	32.340 µm		60.46 meV	20.508 µm		95.33 meV	13.005 µm
15.73 meV	78.839 µm		24.80 meV	49.996 µm		39.10 meV	31.706 µm		61.66 meV	20.106 µm		97.24 meV	12.750 µm
16.04 meV	77.293 µm		25.29 meV	49.016 µm		39.89 meV	31.084 µm		62.90 meV	19.712 µm		99.18 meV	12.500 µm
16.36 meV	75.778 µm		25.80 meV	48.055 µm		40.68 meV	30.474 µm		64.16 meV	19.325 µm		101.17 meV	12.255 µm
16.69 meV	74.292 µm		26.32 meV	47.113 µm		41.50 meV	29.877 µm		65.44 meV	18.947 µm		103.19 meV	12.015 µm
17.02 meV	72.835 µm		26.84 meV	46.189 µm		42.33 meV	29.291 µm		66.75 meV	18.575 µm		105.25 meV	11.779 µm
17.36 meV	71.407 µm		27.38 meV	45.283 µm		43.18 meV	28.717 µm		68.08 meV	18.211 µm		107.36 meV	11.549 µm
17.71 meV	70.007 µm		27.93 meV	44.395 µm		44.04 meV	28.154 µm		69.44 meV	17.854 µm		109.51 meV	11.322 µm
18.06 meV	68.634 µm		28.49 meV	43.525 µm		44.92 meV	27.602 µm		70.83 meV	17.504 µm		111.70 meV	11.100 µm
18.43 meV	67.289 µm		29.06 meV	42.671 µm		45.82 meV	27.060 µm		72.25 meV	17.160 µm		113.93 meV	10.882 µm
18.79 meV	65.969 µm		29.64 meV	41.835 µm		46.73 meV	26.530 µm		73.69 meV	16.824 µm		116.21 meV	10.669 µm
19.17 meV	64.676 µm		30.23 meV	41.014 µm		47.67 meV	26.010 µm		75.17 meV	16.494 µm		118.53 meV	10.460 µm

Near Infrared

E	λ		E	λ		E	λ		E	λ		E	λ
124.00 meV	9.999 µm		195.54 meV	6.341 µm		308.34 meV	4.021 µm		486.22 meV	2.550 µm		766.72 meV	1.617 µm
126.48 meV	9.803 µm		199.45 meV	6.216 µm		314.51 meV	3.942 µm		495.95 meV	2.500 µm		782.06 meV	1.585 µm
129.01 meV	9.610 µm		203.44 meV	6.095 µm		320.80 meV	3.865 µm		505.86 meV	2.451 µm		797.70 meV	1.554 µm
131.59 meV	9.422 µm		207.50 meV	5.975 µm		327.21 meV	3.789 µm		515.98 meV	2.403 µm		813.65 meV	1.524 µm
134.22 meV	9.237 µm		211.65 meV	5.858 µm		333.76 meV	3.715 µm		526.30 meV	2.356 µm		829.92 meV	1.494 µm
136.91 meV	9.056 µm		215.89 meV	5.743 µm		340.43 meV	3.642 µm		536.83 meV	2.310 µm		846.52 meV	1.465 µm
139.64 meV	8.879 µm		220.20 meV	5.630 µm		347.24 meV	3.571 µm		547.56 meV	2.264 µm		863.45 meV	1.436 µm
142.44 meV	8.704 µm		224.61 meV	5.520 µm		354.19 meV	3.501 µm		558.51 meV	2.220 µm		880.72 meV	1.408 µm
145.29 meV	8.534 µm		229.10 meV	5.412 µm		361.27 meV	3.432 µm		569.69 meV	2.176 µm		898.34 meV	1.380 µm
148.19 meV	8.366 µm		233.68 meV	5.306 µm		368.49 meV	3.365 µm		581.08 meV	2.134 µm		916.30 meV	1.353 µm
151.16 meV	8.202 µm		238.36 meV	5.202 µm		375.86 meV	3.299 µm		592.70 meV	2.092 µm		934.63 meV	1.327 µm
154.18 meV	8.042 µm		243.12 meV	5.100 µm		383.38 meV	3.234 µm		604.55 meV	2.051 µm		953.32 meV	1.301 µm
157.26 meV	7.884 µm		247.99 meV	5.000 µm		391.05 meV	3.171 µm		616.65 meV	2.011 µm		972.39 meV	1.275 µm
160.41 meV	7.729 µm		252.95 meV	4.902 µm		398.87 meV	3.108 µm		628.98 meV	1.971 µm		991.84 meV	1.250 µm
163.62 meV	7.578 µm		258.00 meV	4.805 µm		406.85 meV	3.047 µm		641.56 meV	1.933 µm		1.01 eV	1.226 µm
166.89 meV	7.429 µm		263.17 meV	4.711 µm		414.98 meV	2.988 µm		654.39 meV	1.895 µm		1.03 eV	1.202 µm
170.23 meV	7.284 µm		268.43 meV	4.619 µm		423.28 meV	2.929 µm		667.48 meV	1.858 µm		1.05 eV	1.178 µm
173.63 meV	7.141 µm		273.80 meV	4.528 µm		431.75 meV	2.872 µm		680.83 meV	1.821 µm		1.07 eV	1.155 µm
177.10 meV	7.001 µm		279.27 meV	4.440 µm		440.39 meV	2.815 µm		694.44 meV	1.785 µm		1.10 eV	1.132 µm
180.64 meV	6.863 µm		284.86 meV	4.352 µm		449.19 meV	2.760 µm		708.33 meV	1.750 µm		1.12 eV	1.110 µm
184.26 meV	6.729 µm		290.56 meV	4.267 µm		458.18 meV	2.706 µm		722.50 meV	1.716 µm		1.14 eV	1.088 µm
187.94 meV	6.597 µm		296.37 meV	4.183 µm		467.34 meV	2.653 µm		736.95 meV	1.682 µm		1.16 eV	1.067 µm
191.70 meV	6.468 µm		302.29 meV	4.101 µm		476.69 meV	2.601 µm		751.69 meV	1.649 µm		1.19 eV	1.046 µm

Visible Light

E	λ		E	λ		E	λ		E	λ		E	λ
1.77 eV	700.5 nm		1.99 eV	624.6 nm		2.23 eV	556.9 nm		2.50 eV	496.5 nm		2.80 eV	442.7 nm
1.78 eV	697.0 nm		2.00 eV	621.5 nm		2.24 eV	554.1 nm		2.51 eV	494.0 nm		2.81 eV	440.5 nm
1.79 eV	693.5 nm		2.01 eV	618.4 nm		2.25 eV	551.3 nm		2.52 eV	491.6 nm		2.83 eV	438.3 nm
1.80 eV	690.1 nm		2.02 eV	615.3 nm		2.26 eV	548.6 nm		2.53 eV	489.1 nm		2.84 eV	436.1 nm
1.81 eV	686.6 nm		2.03 eV	612.2 nm		2.27 eV	545.9 nm		2.55 eV	486.7 nm		2.86 eV	434.0 nm
1.81 eV	683.2 nm		2.04 eV	609.2 nm		2.28 eV	543.2 nm		2.56 eV	484.3 nm		2.87 eV	431.8 nm
1.82 eV	679.8 nm		2.05 eV	606.1 nm		2.29 eV	540.5 nm		2.57 eV	481.9 nm		2.89 eV	429.7 nm
1.83 eV	676.4 nm		2.06 eV	603.1 nm		2.31 eV	537.8 nm		2.59 eV	479.5 nm		2.90 eV	427.5 nm
1.84 eV	673.1 nm		2.07 eV	600.1 nm		2.32 eV	535.1 nm		2.60 eV	477.1 nm		2.91 eV	425.4 nm
1.85 eV	669.7 nm		2.08 eV	597.1 nm		2.33 eV	532.4 nm		2.61 eV	474.7 nm		2.93 eV	423.3 nm
1.86 eV	666.4 nm		2.09 eV	594.2 nm		2.34 eV	529.8 nm		2.62 eV	472.4 nm		2.94 eV	421.2 nm
1.87 eV	663.1 nm		2.10 eV	591.2 nm		2.35 eV	527.1 nm		2.64 eV	470.0 nm		2.96 eV	419.1 nm
1.88 eV	659.8 nm		2.11 eV	588.3 nm		2.36 eV	524.5 nm		2.65 eV	467.7 nm		2.97 eV	417.0 nm
1.89 eV	656.5 nm		2.12 eV	585.3 nm		2.38 eV	521.9 nm		2.66 eV	465.3 nm		2.99 eV	414.9 nm
1.90 eV	653.2 nm		2.13 eV	582.4 nm		2.39 eV	519.3 nm		2.68 eV	463.0 nm		3.00 eV	412.8 nm
1.91 eV	650.0 nm		2.14 eV	579.5 nm		2.40 eV	516.7 nm		2.69 eV	460.7 nm		3.02 eV	410.8 nm
1.92 eV	646.7 nm		2.15 eV	576.7 nm		2.41 eV	514.2 nm		2.70 eV	458.4 nm		3.03 eV	408.8 nm
1.93 eV	643.5 nm		2.16 eV	573.8 nm		2.42 eV	511.6 nm		2.72 eV	456.2 nm		3.05 eV	406.7 nm
1.94 eV	640.3 nm		2.17 eV	570.9 nm		2.44 eV	509.1 nm		2.73 eV	453.9 nm		3.06 eV	404.7 nm
1.95 eV	637.1 nm		2.18 eV	568.1 nm		2.45 eV	506.5 nm		2.75 eV	451.6 nm		3.08 eV	402.7 nm
1.96 eV	634.0 nm		2.19 eV	565.3 nm		2.46 eV	504.0 nm		2.76 eV	449.4 nm		3.09 eV	400.7 nm
1.97 eV	630.8 nm		2.20 eV	562.5 nm		2.47 eV	501.5 nm		2.77 eV	447.1 nm		3.11 eV	398.7 nm
1.98 eV	627.7 nm		2.22 eV	559.7 nm		2.48 eV	499.0 nm		2.79 eV	444.9 nm		3.13 eV	396.7 nm

Near Ultraviolet

E	λ		E	λ		E	λ		E	λ		E	λ
1.24 eV	999.9 nm		1.96 eV	634.1 nm		3.08 eV	402.1 nm		4.86 eV	255.0 nm		7.67 eV	161.7 nm
1.26 eV	980.3 nm		1.99 eV	621.6 nm		3.15 eV	394.2 nm		4.96 eV	250.0 nm		7.82 eV	158.5 nm
1.29 eV	961.0 nm		2.03 eV	609.5 nm		3.21 eV	386.5 nm		5.06 eV	245.1 nm		7.98 eV	155.4 nm
1.32 eV	942.2 nm		2.08 eV	597.5 nm		3.27 eV	378.9 nm		5.16 eV	240.3 nm		8.14 eV	152.4 nm
1.34 eV	923.7 nm		2.12 eV	585.8 nm		3.34 eV	371.5 nm		5.26 eV	235.6 nm		8.30 eV	149.4 nm
1.37 eV	905.6 nm		2.16 eV	574.3 nm		3.40 eV	364.2 nm		5.37 eV	231.0 nm		8.47 eV	146.5 nm
1.40 eV	887.9 nm		2.20 eV	563.0 nm		3.47 eV	357.1 nm		5.48 eV	226.4 nm		8.63 eV	143.6 nm
1.42 eV	870.4 nm		2.25 eV	552.0 nm		3.54 eV	350.1 nm		5.59 eV	222.0 nm		8.81 eV	140.8 nm
1.45 eV	853.4 nm		2.29 eV	541.2 nm		3.61 eV	343.2 nm		5.70 eV	217.6 nm		8.98 eV	138.0 nm
1.48 eV	836.6 nm		2.34 eV	530.6 nm		3.68 eV	336.5 nm		5.81 eV	213.4 nm		9.16 eV	135.3 nm
1.51 eV	820.2 nm		2.38 eV	520.2 nm		3.76 eV	329.9 nm		5.93 eV	209.2 nm		9.35 eV	132.7 nm
1.54 eV	804.2 nm		2.43 eV	510.0 nm		3.83 eV	323.4 nm		6.05 eV	205.1 nm		9.53 eV	130.1 nm
1.57 eV	788.4 nm		2.48 eV	500.0 nm		3.91 eV	317.1 nm		6.17 eV	201.1 nm		9.72 eV	127.5 nm
1.60 eV	772.9 nm		2.53 eV	490.2 nm		3.99 eV	310.8 nm		6.29 eV	197.1 nm		9.92 eV	125.0 nm
1.64 eV	757.8 nm		2.58 eV	480.5 nm		4.07 eV	304.7 nm		6.42 eV	193.3 nm		10.12 eV	122.6 nm
1.67 eV	742.9 nm		2.63 eV	471.1 nm		4.15 eV	298.8 nm		6.54 eV	189.5 nm		10.32 eV	120.2 nm
1.70 eV	728.4 nm		2.68 eV	461.9 nm		4.23 eV	292.9 nm		6.67 eV	185.8 nm		10.53 eV	117.8 nm
1.74 eV	714.1 nm		2.74 eV	452.8 nm		4.32 eV	287.2 nm		6.81 eV	182.1 nm		10.74 eV	115.5 nm
1.77 eV	700.1 nm		2.79 eV	444.0 nm		4.40 eV	281.5 nm		6.94 eV	178.5 nm		10.95 eV	113.2 nm
1.81 eV	686.3 nm		2.85 eV	435.2 nm		4.49 eV	276.0 nm		7.08 eV	175.0 nm		11.17 eV	111.0 nm
1.84 eV	672.9 nm		2.91 eV	426.7 nm		4.58 eV	270.6 nm		7.22 eV	171.6 nm		11.39 eV	108.8 nm
1.88 eV	659.7 nm		2.96 eV	418.3 nm		4.67 eV	265.3 nm		7.37 eV	168.2 nm		11.62 eV	106.7 nm
1.92 eV	646.8 nm		3.02 eV	410.1 nm		4.77 eV	260.1 nm		7.52 eV	164.9 nm		11.85 eV	104.6 nm