Inertia Moment (J) Quick Reference Table

2026/06/15

This table shows the J-value [kg·m²] for a circular plate made of steel (specific gravity 7.85) with a thickness of 10 mm and a diameter of D mm. The values in the vertical column are given for thicknesses in 10-mm increments, while the values in the horizontal column are given for thicknesses increased by 1 mm from those in the vertical column. For circular plates with thicknesses other than 10 mm, the J-value can be calculated by multiplying the value in the table by the result of dividing the actual thickness (l mm) by 10 mm.For materials other than steel, the value can be calculated by multiplying the table value by the appropriate coefficient.

Cast iron	0.93
Aluminum	0.33
Copper	1.1

For example, for a piece of aluminum with a diameter of 205 mm and a thickness of 20 mm, multiply the value of 0.01361 found at the intersection of row 200 and column 5 in the table by 2, then multiply that result by the material coefficient of 0.33 to obtain a value of 0.0089826 [kg·m²].

Diameter [mm]	J [kg·m²]
Diameter [mm]	0	1	2	3	4	5	6	7	8	9
10	0.000000077	0.000000113	0.000000160	0.000000220	0.000000296	0.000000390	0.000000505	0.000000644	0.000000809	0.00000104
20	0.00000123	0.00000150	0.00000181	0.00000216	0.00000256	0.00000301	0.00000352	0.00000410	0.00000474	0.00000545
30	0.00000624	0.00000712	0.00000808	0.00000914	0.00001030	0.00001156	0.00001294	0.00001444	0.00001607	0.00001783
40	0.00001973	0.00002178	0.00002398	0.00002635	0.00002889	0.00003160	0.00003451	0.00003761	0.00004091	0.00004443
50	0.00004817	0.00005214	0.00005635	0.00006081	0.00006553	0.00007052	0.00007579	0.00008135	0.00008721	0.00009339
60	0.00009988	0.0001067	0.0001139	0.0001214	0.0001293	0.0001376	0.0001462	0.0001553	0.0001648	0.0001747
70	0.0001850	0.0001958	0.0002071	0.0002189	0.0002311	0.0002439	0.0002571	0.0002709	0.0002853	0.0003002
80	0.0003157	0.0003317	0.0003484	0.0003657	0.0003837	0.0004023	0.0004216	0.0004415	0.0004622	0.0004835
90	0.0005056	0.0005285	0.0005521	0.0005765	0.0006017	0.0006277	0.0006546	0.0006823	0.0007108	0.0007403
100	0.0007707	0.0008020	0.0008342	0.0008674	0.0009016	0.0009368	0.0009730	0.001010	0.001048	0.001088
110	0.001128	0.001170	0.001213	0.001257	0.001302	0.001348	0.001395	0.001444	0.001494	0.001545
120	0.001598	0.001652	0.001707	0.001764	0.001822	0.001882	0.001942	0.002005	0.002069	0.002134
130	0.002201	0.002270	0.002340	0.002411	0.002485	0.002560	0.002636	0.002715	0.002795	0.002877
140	0.002961	0.003046	0.003133	0.003223	0.003314	0.003407	0.003502	0.003599	0.003698	0.003799
150	0.003902	0.004007	0.004114	0.004223	0.004335	0.004448	0.004564	0.004682	0.004803	0.004926
160	0.005051	0.005178	0.005308	0.005440	0.005575	0.005712	0.005852	0.005994	0.006139	0.006287
170	0.006437	0.006590	0.006745	0.006903	0.007064	0.007228	0.007395	0.007564	0.007737	0.007912
180	0.008090	0.008271	0.008456	0.008643	0.008834	0.009027	0.009224	0.009424	0.009627	0.009834
190	0.01004	0.01026	0.01047	0.01069	0.01092	0.01114	0.01137	0.01161	0.01184	0.01209
200	0.01233	0.01258	0.01283	0.01309	0.01335	0.01361	0.01388	0.01415	0.01443	0.01470
210	0.01499	0.01528	0.01557	0.01586	0.01616	0.01647	0.01678	0.01709	0.01741	0.01773
220	0.01805	0.01838	0.01872	0.01906	0.01940	0.01975	0.02010	0.02046	0.02083	0.02119
230	0.02157	0.02194	0.02233	0.02271	0.02311	0.02350	0.02391	0.02431	0.02473	0.02515
240	0.02557	0.02600	0.02643	0.02687	0.02732	0.02777	0.02822	0.02869	0.02915	0.02963
250	0.03010	0.03059	0.03108	0.03158	0.03208	0.03259	0.03310	0.03362	0.03415	0.03468
260	0.03522	0.03576	0.03631	0.03687	0.03744	0.03801	0.03858	0.03917	0.03976	0.04035
270	0.04096	0.04157	0.04218	0.04281	0.04344	0.04408	0.04472	0.04537	0.04603	0.04670
280	0.04737	0.04805	0.04874	0.04943	0.05014	0.05085	0.05156	0.05229	0.05302	0.05376
290	0.05451	0.05526	0.05603	0.05680	0.05758	0.05837	0.05916	0.05996	0.06078	0.06160
300	0.06242	0.06326	0.06411	0.06496	0.06582	0.06669	0.06757	0.06846	0.06935	0.07026
310	0.07117	0.07210	0.07303	0.07397	0.07492	0.07588	0.07685	0.07782	0.07881	0.07981
320	0.08081	0.08183	0.08285	0.08388	0.08493	0.08598	0.08704	0.08812	0.08920	0.09029
330	0.09140	0.09251	0.09363	0.09476	0.09591	0.09706	0.09823	0.09940	0.10059	0.10178
340	0.10299	0.10420	0.10543	0.10667	0.10792	0.10918	0.11045	0.11173	0.11303	0.11433
350	0.11565	0.11698	0.11832	0.11967	0.12103	0.12240	0.12379	0.12518	0.12659	0.12801
360	0.12944	0.13089	0.13234	0.13381	0.13529	0.13679	0.13829	0.13981	0.14134	0.14288
370	0.14444	0.14600	0.14758	0.14918	0.15078	0.15240	0.15404	0.15568	0.15734	0.15901
380	0.16070	0.16239	0.16411	0.16583	0.16757	0.16932	0.17109	0.17287	0.17466	0.17647
390	0.17829	0.18013	0.18198	0.18384	0.18572	0.18761	0.18952	0.19144	0.19338	0.19533
400	0.19729	0.19927	0.20127	0.20328	0.20530	0.20734	0.20940	0.21147	0.21356	0.21566
410	0.21777	0.21991	0.22205	0.22422	0.22640	0.22859	0.23080	0.23303	0.23527	0.23753
420	0.23981	0.24210	0.24441	0.24674	0.24908	0.25143	0.25381	0.25620	0.25861	0.26103
430	0.26348	0.26594	0.26841	0.27091	0.27342	0.27595	0.27849	0.28106	0.28364	0.28624
440	0.28886	0.29149	0.29414	0.29681	0.29950	0.30221	0.30494	0.30768	0.31044	0.31322
450	0.31602	0.31884	0.32168	0.32454	0.32741	0.33030	0.33322	0.33615	0.33910	0.34207
460	0.34506	0.34808	0.35111	0.35416	0.35722	0.36031	0.36342	0.36655	0.36970	0.37287
470	0.37606	0.37927	0.38251	0.38576	0.38903	0.39232	0.39564	0.39897	0.40233	0.40571
480	0.40910	0.41252	0.41597	0.41943	0.42291	0.42642	0.42995	0.43350	0.43707	0.44066
490	0.44428	0.44791	0.45158	0.45526	0.45896	0.46269	0.46644	0.47021	0.47401	0.47783
500	0.48167	0.48553	0.48942	0.49333	0.49727	0.50123	0.50521	0.50922	0.51324	0.51730

Inertia Moment (J) Quick Reference Table

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