Atomic Mass Calculator

The Atomic Mass Calculator will calculate the:

Atomic mass of any isotope of a chemical element when the number of protons (atomic number) and the total number of nucleons are known. The results are displayed as atomic mass unit (u) or kilograms (kg), the two options are exclusive, that is if one mass is written in kg for example, everything else appear in kilogram only.

Calculation Parameters: When the mass of proton and neutron are expressed in atomic mass unit (u) the result is displayed in atomic mass unit (u); if masses are expressed in kilogram (kg) the result will be displayed in kilograms. The following conversion factors are used in the Atomic Mass Calculator:

1 u = 1.66054 × 10^-27 kg
m_p = 1.6726 × 10^-27 kg = 1.007287 u
m_n = 1.6749 × 10^-27 kg = 1.008648 u

Atomic Mass Calculator
Atomic Mass Calculation Examples from the Element Table [See below calculator results]
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Calculator Precision (Decimal Places)
Atomic number (Z)
Atomic mass number (A)
u [atomic mass unit]kg [kilograms]
Mass of proton (m_p) kg	× 10 power of
Mass of neutron (m_n) kg	× 10 power of
∞ Real Number Results∑ Scientific Number Results

HHeLiBeBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKrbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTIPbBiPoAtRnFrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnUutFlUupLvUusUuo

Note:

Atomic number is the number of protons in the nucleus
Atomic mass number is the number of protons and neutrons in the nucleus

Atomic Mass Calculator Results (detailed calculations and formula below)
Atomic Mass Calculation
The atomic mass M is kg [kilograms]
M = Z ∙ m_p + (A - Z) ∙ m_n M = ∙ + ( - ) ∙ M = ∙ + ∙ M =
Atomic Mass Calculator Input Values
Atomic number (Z)
Atomic mass number (A)
Mass of proton (m_p) kg [kilograms]
Mass of neutron (m_n) kg [kilograms]

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Atomic Mass Calculation Examples

The Atomic Mass Calculator contains a number of preset examples based on the elements listed in the periodic table below. Simply click on the element symbol in the Atomic Mass Calculator to see the step by step calculations for atomic mass for the select element.

Atomic Mass Calculator - Element Table with Associated Atomic Number and Number of Neutrons and Protons in the Nucleus
Element	Symbol	Atomic Number	Neutrons	Protons
Hydrogen	H	1	0	1
Helium	He	2	2	2
Lithium	Li	3	4	3
Beryllium	Be	4	5	4
Boron	B	5	6	5
Carbon	C	6	6	6
Nitrogen	N	7	8	7
Oxygen	O	8	10	8
Fluorine	F	9	10	9
Neon	Ne	10	10	10
Sodium	Na	11	11	11
Magnesium	Mg	12	12	12
Aluminum	Al	13	13	14
Silicon	Si	14	14	14
Phosphorus	P	15	15	17
Sulfur	S	16	16	23
Chlorine	Cl	17	18	17
Argon	Ar	18	18	18
Potassium	K	19	20	19
Calcium	Ca	20	20	20
Scandium	Sc	21	24	21
Titanium	Ti	22	26	22
Vanadium	V	23	28	23
Chromium	Cr	24	50	24
Manganese	Mn	25	25	30
Iron	Fe	26	30	26
Cobalt	Co	27	59	27
Nickel	Ni	28	30	28
Copper	Cu	29	35	29
Zinc	Zn	30	64	30
Gallium	Ga	31	39	31
Germanium	Ge	32	70	32
Arsenic	As	33	42	33
Selenium	Se	34	45	34
Bromine	Br	35	45	35
Krypton	Kr	36	48	36
Rubidium	b	37	48	37
Strontium	Sr	38	50	38
Yttrium	Y	39	50	39
Zirconium	Zr	40	51	40
Niobium	Nb	41	52	41
Molybdenum	Mo	42	94	42
Technetium	Tc	43	97	43
Ruthenium	Ru	44	57	44
Rhodium	Rh	45	58	45
Palladium	Pd	46	60	46
Silver	Ag	47	108	47
Cadmium	Cd	48	108	48
Indium	In	49	66	49
Tin	Sn	50	69	50
Antimony	Sb	51	71	51
Tellurium	Te	52	76	52
Iodine	I	53	74	53
Xenon	Xe	54	77	54
Cesium	Cs	55	78	55
Barium	Ba	56	81	56
Lanthanum	La	57	82	57
Cerium	Ce	58	78	58
Praseodymium	Pr	59	82	59
Neodymium	Nd	60	142	60
Promethium	Pm	61	84	61
Samarium	SSm	62	88	62
Europium	Eu	63	90	63
Gadolinium	Gd	64	93	64
Terbium	Tb	65	159	65
Dysprosium	Dy	66	97	66
Holmium	Ho	67	98	67
Erbium	Er	68	99	68
Thulium	Tm	69	100	69
Ytterbium	Yb	70	100	70
Lutetium	Lu	71	104	71
Hafnium	Hf	72	104	72
Tantalum	Ta	73	108	73
Tungsten	W	74	110	74
Rhenium	Re	75	110	75
Osmium	Os	76	114	76
Iridium	Ir	77	124	77
Platinum	Pt	78	117	78
Gold	Au	79	118	79
Mercury	Hg	80	121	80
Thallium	TI	81	123	81
Lead	Pb	82	125	82
Bismuth	Bi	83	126	83
Polonium	Po	84	125	84
Astatine	At	85	125	85
Radon	Rn	86	136	86
Francium	Fr	87	136	87
Radium	Ra	88	138	88
Actinium	Ac	89	138	89
Thorium	Th	90	142	90
Protactinium	Pa	91	140	91
Uranium	U	92	146	92
Neptunium	Np	93	144	93
Plutonium	Pu	94	136	94
Americium	Am	95	146	95
Curium	Cm	96	166	96
Berkelium	Bk	97	150	97
Californium	Cf	98	153	98
Einsteinium	Es	99	153	99
Fermium	Fm	100	157	100
Mendelevium	Md	101	157	101
Nobelium	No	102	157	102
Lawrencium	Lr	103	159	103
Rutherfordium	Rf	104	157	104
Dubnium	Db	105	161	105
Seaborgium	Sg	106	159	106
Bohrium	Bh	107	155	107
Hassium	Hs	108	157	108
Meitnerium	Mt	109	157	109
Darmstadtium	Ds	110	157	110
Roentgenium	Rg	111	161	111
Copernicium	Cn	112	155	112
Ununtrium	Uut	113	126	113
Flerovium	Fl	114	170	114
Ununpentium	Uup	115	172	115
Livermorium	Lv	116	174	116
Ununseptium	Uus	117	176	117
Ununoctium	Uuo	118	176	118

Discover Physics with free Physics Revision Notes and Physics Calculator: Atomic Mass. This image shows the properties and atomic mass formula for the Atomic Mass. The Atomic Mass Calculator will calculate the Atomic mass of any isotope of a chemical element when the number of protons (atomic number) and the total number of nucleons are known.

Atomic Mass Formula and Calculation

M = Z ∙ m_p + (A - Z) ∙ m_n

Nucleus Physics Physics Tutorials associated with the Atomic Mass Calculator

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