radiocarbon to calendar
date conversion


14C → Cal






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The following table is based on the IntCal20 Radiocarbon Age Northern Hemisphere calibration curve [details]. It was originally prepared as an aid to own ongoing studies [pages].

All years are Before Present (BP), meaning before AD 1950. Entries in the table represent seventy-five points on the IntCal20 curve that indicate relevant changes in the atmospheric 14C:12C ratio over some twenty thousand years. Points may be compared with fluctuations in the Marine Isotope Stage (MIS) record [chart].


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14C 
2944
3720
3934
4188
4911
5393
5955
6490
7801
8055
8390
8778
8898
9206
9514
9674
9996
10143
10370
10410
10798
11066
11320
11454
11655




























Cal 
2967
4002
4247
4642
5526
6098
6779
7391
8494
8834
9392
9787
10113
10413
10862
11134
11393
11760
12142
12427
12700
12958
13108
13258
13475


14C 
11855
12123
12244
12337
12391
12511
12632
12859
13060
13220
13394
13408
13582
13729
13943
14291
14384
14558
14920
15134
15321
15656
15749
15776
16044




























Cal 
13680
13993
14102
14265
14524
14877
15014
15313
15653
15830
16075
16184
16429
16647
17001
17314
17464
17790
18131
18444
18621
18879
18947
19124
19437


14C 
16204
16325
16365
16445
16579
16713
16913
17168
17462
17569
17743
18145
18158
18640
18733
19135
19416
19429
20004
20272
20406
20500
20754
20874
21155




























Cal 
19546
19778
19873
19968
20118
20268
20485
20744
21030
21302
21452
22119
22269
22609
22868
23113
23548
23684
24052
24351
24528
24787
25141
25236
25426

table as PDF


 
online calculator

Enter any date from 2944 to 21155 14C years (no commas)




There is also a download available as a zip file [download].



The presentational format of the table and calculator output might tend to appear more precise than the reality of the situation as regards putting an age to something. A margin of uncertainty is advised, typically ±200 years in the case of the above conversions based on the IntCal20 curve.

Whilst every care is taken, no liability is assumed.


IntCal20 data (9,501 entries)




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Prepared by Brian Williams, June and December 2023.