From: http://physics.nist.gov/constants
Energy Equivalents
Relevant unit
	J		kg		m-1		Hz
1J	(1 J) = 1 J		(1 J)/c2 = 1.112650 056...>	< 10~17kg	(1 J)/he = 5.03411701(22) x	1024 m-1	(1 J)/h = 1.509 1 90 311(67) x 1033 Hz
1kg	(1 kg)c2 = 8.987 551787... >	< 1016 J	(1 kg) = 1kg		(1 kg)c/h = 4.524438 73(20) x	1041 m-1	(1 kg)c2//i = 1.35 6 3 9 2 6 08(60) x 1050 Hz
1 m-1	(1 m~1)hc = 1.986 445 684(88)	x 10~25 J	(1 m-1)h/c = 2.210 218 902(98)	x 10~42 kg	(Im-1)^ 1 m-1		(1 m-^c^ 299 792 458 Hz
1 Hz	(1 Hz)h = 6.626 069 57(29) >	c 10-34J	(1 Hz)h/c2 = 7.372 496 68(33) >	c 10~51 kg	(1 Hz)/c = 3.335 640 951... x	lO^m-1	(1 Hz) = 1 Hz
1 K	(1 K)k = 1.380 6488(13) x :	io-23 J	(1 K)k/c2 = 1.5361790(14) x	IO"40 kg	(1 K)k/hc = 69.503 476(63) m-	l	(1 K)k/h = 2.083 6618(19) x 1010 Hz
1 eV	(1 eV) = 1.602176 565(35)	x 10~19 J	(leV)/c2 = 1.782 661845(39)	x 10~36 kg	(1 eV)/7ic = 8.065 544 29(18) x	105 m-1	(1 eV)//i = 2.417 989 348(53) x 1014 Hz
1 u	(1 u)c2 = 1.492 417 954(66)	x 10~10 J	(lu) = 1.660 538 921(73)	x 10~27kg	(lu)c/fc = 7.513 006 6042(53)	x 1014 m-1	(1 u)c2/h = 2.252 342 7168(16) x 1023 Hz
\Eh	(1 Eh) = 4.359 744 34(19) >	c 10-18J	(1 Eh)/c2 = 4.850 869 79(21) >	c 10~35 kg	(1 Eh)/hc = 2.194 746 313 708(11) x 107 m-1		(1 Eh)/h = 6.579 683 920 729(33) x 1015 Hz
The values of some energy equivalents derived from the relations E — mc2 — hc/X — hv — kT, and based on the 2010 COD ATA adjustment of the values of the constants; 1 eV — (e/C) J, 1 u — mu — j^m(12C) — 10~3 kg mol_1/./vA, and E^ — 2ROQhc — a2mec2 is the Hartree energy (hartree).
From: http://physics.nist.gov/constants
Energy Equivalents
Relevant unit
	K		eV	u	Eh
1J	(1 J)/k = 7.242 9716(66) x	1022 K	(U) = 6.241509 34(14) x 1018 eV	(1 J)/c2 = 6.700 535 85(30) x 109 u	(U) = 2.293 712 48(10) x 1017 Eh
1kg	(1 kg)c2/k = 6.509 6582(59) x	1039 K	(1 kg)c2 = 5.60 9 5 8 8 85(12) x 1035 eV	(lkg) = 6.022 141 29(27) x 1026 u	(1 kg)c2 = 2.061485 968(91) x 1034 Eh
1 m-1	(1 m-^hc/k = 1.438 7770(13) x	10~2 K	(1 m~1)hc = 1.239 841930(27) x 10~6 eV	(1 mr1)h/c = 1.331 025 051 20(94) x 10~15 u	(1 m~1)hc = 4.556 335 252 755(23) x 10~8 Eh
1 Hz	(1 Hz)h/k = 4.799 2434(44) x	10~n K	(1 Hz)h = 4.135 667516(91) x 10~15eV	(1 Hz)h/c2 = 4.439 8216689(31) x 10~24 u	(1 Bz)h = 1.519 829 846 0045(76) x 10~16 Eh
1 K	(1K) = 1 K		(1 K)k = 8.617 3324(78) x 10~5eV	(1 K)k/c2 = 9.2510868(84) x 10~14 u	(1 K)k = 3.166 8114(29) x 10~6 Eh
1 eV	(1 eV)//j = 1.160 4519(11) x	104K	(1 eV) = 1 eV	(leV)/c2 = 1.073 544150(24) x 10~9 u	(1 eV) = 3.674 932 379(81) x 10~2 Eh
1 u	(1 u)c2/k = 1.080 954 08(98)	x 1013K	(1 u)c2 = 931.494 061(21) x 106 eV	(lu) = 1 u	(1 u)c2 = 3.423177 6845(24) x 107 Eh
\Eh	(1 Eh)/k = 3.157 7504(29) x	105 K	(1 Eh) = 27.211385 05(60) eV	(1 Eh)/c2 = 2.921262 3246(21) x 10~8 u	(1 Eh) = lEh
The values of some energy equivalents derived from the relations E — mc2 — hc/X — hv — kT, and based on the 2010 COD ATA adjustment of the values of the constants; 1 eV — (e/C) J, 1 u — mu — j^m(12C) — 10~3 kg mol_1/./vA, and E^ — 2ROQhc — a2mec2 is the Hartree energy (hartree).