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Matthew Thomas Parker (b. 1980) is an
Australian recreational mathematician, author, and science communicator based in the United Kingdom. His "Stand-up Maths" YouTube channel has gained more than one million subscribers. Parker's Pi Day (March 14) challenges, where he calculates (by hand) π with the
615:
Some observed the entire month of March 2014 (3/14) as "Pi Month". In the year 2015, March 14 was celebrated as "Super Pi Day". It had special significance, as the date is written as 3/14/15 in month/day/year format. At 9:26:53, the date and time together represented the first ten digits of
841:, a common multiple in mathematical formulae, and approximates to 6.28. Some have argued that 𝜏 is the clearer and more fundamental constant and that Tau Day should be celebrated alongside or instead of Pi Day. Celebrants of this date jokingly suggest eating "twice the pie".
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to prospective students for delivery on Pi Day. Starting in 2012, MIT has announced it will post those decisions (privately) online on Pi Day at exactly 6:28 pm, which they have called "Tau Time", to honor the rival numbers pi and
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equally. In 2015, the regular decisions were put online at 9:26 am, following that year's "pi minute", and in 2020, regular decisions were released at 1:59 pm, making the first six digits of pi.
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spent six days calculating 105 correct digits of pi by hand, in what Parker claimed was "the biggest hand calculation in a century". On 15 August 2024, the
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was named in his honor. The citation highlights Parker's biennial "Pi Day challenges", stating that they have helped to popularize mathematics.
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celebrating the holiday, with the word Google laid over images of circles and pi symbols; and for the 30th anniversary in 2018, it was a
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and pie restaurants offer discounts, deals, and free products on Pi Day. Also, some schools hold competitions as to which student can
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1325:"Pi Month Celebration & Circle of Discovery Award Presentation | College of Computer, Mathematical, and Natural Sciences"
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718:'s birthday, which is also March 14. Einstein lived in Princeton for more than twenty years while working at the
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Some also celebrate pi on
November 10, since it is the 314th day of the year (in leap years, on November 9).
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543:'s 40th General Conference designated Pi Day as the International Day of Mathematics in November 2019.
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United States. Cong. House. Supporting the designation of Pi Day, and for other purposes. 111th Cong.
855:
722:. In addition to pie eating and recitation contests, there is an annual Einstein look-alike contest.
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In 1988, the earliest known official or large-scale celebration of Pi Day was organized by
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Other dates when people celebrate pi include Pi
Approximation Day on July 22 (22/7 in the
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Creme pie in celebration of Pi day showing the Greek letter and the first digits of Pi.
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date format), but related celebrations have been held on alternative dates.
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1894:"It's Pi Day today. But these people say we should refuse to celebrate it"
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1995:"In case Pi Day wasn't enough, it's now 'Tau Day' on the Internet"
1374:"March 14, 2015 Will Be A Once-In-A-Century Thrill For Math Geeks"
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1784:"Pi Day: Help yourself to a slice of infinite, transcendental pi"
755:
2092:) on 14 March 2020, the first International Day of Mathematics (
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The biggest hand calculation in a century! [Pi Day 2024]
714:, hosts numerous events in a combined celebration of Pi Day and
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1849:. Vol. 7. Anak Sudarti Foundation Bulletin. pp. 7–8.
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International
Council for Industrial and Applied Mathematics
1635:"[Pinned] This is the way...to check your decisions"
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684:), and the coincidental circular shape of many pies. Many
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620:, and later that second, "Pi Instant" represented all of
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1925:"Pi Day Turns 25: Why We Celebrate an Irrational Number"
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Pi Day has been observed in many ways, including eating
45:, the organizer of the first Pi Day celebration, at the
1952:"Jeffrey Aronson: When I use a word ... The Days of Pi"
762:
Pi Day is frequently observed on March 14 (3/14 in the
1459:"Celebrate Pi Day With These Deals Around North Texas"
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Pi Day celebration by local scientists in
Indonesia
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1485:"Honiton Community College Pi Day – Jazmin Year 9"
2130:Events commemorating achievements in the sciences
1770:help of volunteers, have popularized mathematics.
1668:Princeton Regional Convention and Visitors Bureau
876:A grocery store selling pies for $ 3.14 on Pi Day
690:recall pi to the highest number of decimal places
1664:"Princeton Pi Day & Einstein Birthday Party"
1348:"Celebrate The Only Super Pi Day Of The Century"
1170:"A place where learning pi is a piece of cake"
804:, some people celebrate Pi Day every July 22.
802:a country that uses the DD/MM/YYYY date format
757:this circle is not perfect at illustrating pi.
655:and discussing the significance of the number
2115:
1513:. Honitoncollege.devon.sch.uk. Archived from
1439:"Wednesday's Google Doodle Celebrates Pi Day"
1220:"National Pi Day? Congress makes it official"
467:
8:
1658:
1656:
1084:Notices of the American Mathematical Society
2240:Second International Polar Year (1932–1933)
1875:"Tau Day: Why you should eat twice the pie"
1113:"Any way you slice it, pi's transcendental"
991:"Pi Day 2015: a sweet treat for maths fans"
16:Annual mathematical celebration on March 14
2235:First International Polar Year (1882–1883)
2122:
2108:
2100:
1859:: CS1 maint: location missing publisher (
1816:"Pi Approximation Day is celebrated today"
1075:Rousseau, Christiane (September 1, 2019).
968:"On Pi Day, one number 'reeks of mystery'"
557:) and June 28 (6.28, an approximation of 2
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1613:"Keep your eyes to the skies this Pi Day"
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1018:"Nedräkning mot internationella Pi-dagen"
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732:and a team of hundreds of volunteers at
663:based on the words "pi" and "pie" being
2194:International Day of Human Space Flight
1538:"Pi fans meet March 14 (3.14, get it?)"
1398:Rosenthal, Jeffrey S. (February 2015).
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1300:"It's Not Just Pi Day, It's Pi Month!"
817:, is observed on June 28 (6/28 in the
537:United States House of Representatives
2270:International Year of Crystallography
1796:from the original on October 19, 2023
697:Massachusetts Institute of Technology
539:supported the designation of Pi Day.
7:
2331:Recurring events established in 1988
2245:International Polar Year (2007–2008)
2148:Darwin Centennial Celebration (1959)
2013:"Tau Day – Come Eat Twice the (Pi)e"
1822:. Verizon Foundation. Archived from
1723:from the original on August 30, 2024
1511:"HCC Celebrate International Pi Day"
1218:McCullagh, Declan (March 11, 2009).
966:Landau, Elizabeth (March 12, 2010).
772:is observed on July 22 (22/7 in the
527:. Celebrations often involve eating
1148:Australian Broadcasting Corporation
938:314159 are the first six digits of
2255:International Year of Planet Earth
2067:NPR provides a "Pi Rap" audiovideo
1193:"Exploratorium 22nd Annual Pi Day"
1077:"International Day of Mathematics"
1058:"International Day of Mathematics"
14:
2306:1988 establishments in California
1905:from the original on May 26, 2022
1168:Apollo, Adrian (March 10, 2007).
1111:Berton, Justin (March 11, 2009).
1927:. March 14, 2013. Archived from
1742:International Astronomical Union
1298:Main, Douglas (March 14, 2014).
881:
869:
854:
669:
100:competitions, discussions about
2265:International Year of Chemistry
2260:International Year of Astronomy
2143:Alfred Russel Wallace centenary
2052:Exploratorium's Pi Day Web Site
1782:Parker, Matt (March 14, 2011).
1713:Crawford, Tom (April 4, 2024),
1615:. MIT Admissions. March 6, 2015
1589:McGann, Matt (March 13, 2012).
1570:. MIT Admissions. March 7, 2012
1536:McClan, Erin (March 14, 2007).
1195:. Exploratorium. Archived from
989:Bellos, Alex (March 14, 2015).
77:3, 1, and 4 are the three most
2250:International Geophysical Year
2077:Professor Lesser's Pi Day page
1688:Matt Parker (March 13, 2024).
1327:. Cmns.umd.edu. March 11, 2014
1022:Swedish national radio company
825:, denoted by the Greek letter
85:in its decimal representation.
1:
1976:Bartholomew, Randyn Charles.
1346:Mack, Eric (March 14, 2015).
1274:"30th Anniversary of Pi Day!"
1024:(in Swedish). March 14, 2015.
829:, is the ratio of a circle's
1746:"New Names of Minor Planets"
1416:10.4169/mathhorizons.22.3.22
720:Institute for Advanced Study
701:application decision letters
2275:International Year of Light
1716:Carnival of Mathematics 226
1144:"The infinite appeal of pi"
640:, a country food market in
636:Pi Day related offering at
579:San Francisco Exploratorium
535:competitions. In 2009, the
2352:
2285:World Year of Physics 2005
1372:Ro, Sam (March 13, 2014).
727:recreational mathematician
18:
2321:Observances about science
1487:. YouTube. Archived from
581:, where Shaw worked as a
266:Madhava's correction term
35:
2280:International Space Year
2136:Anniversary celebrations
776:date format), since the
445:Other topics related to
19:Not to be confused with
1568:"I have SMASHING news!"
1118:San Francisco Chronicle
1044:August 7, 2009, at the
2336:Unofficial observances
2204:National Astronaut Day
2027:"Pi Day – Fun Holiday"
1845:Purworini, D. (2016).
759:
644:
642:Colts Neck, New Jersey
590:non-binding resolution
170:mathematical constant
1950:BMJ (June 22, 2018).
1548:on September 27, 2013
754:
734:City of London School
712:Princeton, New Jersey
699:has often mailed its
635:
495:mathematical constant
219:Use in other formulae
1881:on January 12, 2013.
1702:– via YouTube.
1517:on February 22, 2014
821:format). The number
770:Pi Approximation Day
163:a series of articles
152:Pi Approximation Day
1993:Landau, Elizabeth.
1826:on December 1, 2010
1744:(August 15, 2024).
1719:, The Aperiodical,
1491:on October 17, 2013
1039:Library of Congress
515:, an employee of a
505:significant figures
427:Squaring the circle
362:Chudnovsky brothers
352:Srinivasa Ramanujan
79:significant figures
2209:National Space Day
1901:. March 13, 2018.
1591:"Pi Day, Tau Time"
1142:(March 10, 2011).
760:
738:main-belt asteroid
645:
638:Delicious Orchards
491:annual celebration
317:Ludolph van Ceulen
2311:March observances
2293:
2292:
2029:. Timeanddate.com
1979:Why Tau Trumps Pi
1931:on March 14, 2013
1199:on March 14, 2011
1140:Borwein, Jonathan
900:Lists of holidays
791:approximation of
747:Alternative dates
741:314159 Mattparker
552:approximation of
484:
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156:
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2316:July observances
2228:Year long events
2174:Cosmonautics Day
2164:Ada Lovelace Day
2157:Regular holidays
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1877:. Archived from
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594:111 H. Res. 224
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389:A History of Pi
367:Yasumasa Kanada
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413:
408:
400:
399:
395:
394:
393:
392:
385:
377:
376:
372:
371:
370:
369:
364:
359:
354:
349:
347:William Shanks
344:
339:
334:
329:
324:
322:François Viète
319:
314:
309:
304:
299:
294:
289:
281:
280:
276:
275:
274:
273:
268:
263:
261:Approximations
258:
256:Less than 22/7
250:
249:
245:
244:
243:
242:
237:
229:
228:
224:
223:
222:
221:
216:
211:
203:
202:
198:
197:
177:
176:
167:
166:
154:
153:
150:
146:
145:
142:
138:
137:
134:
130:
129:
121:March 14, 2025
119:
118:Next time
115:
114:
109:
105:
104:
91:
87:
86:
75:
71:
70:
67:
63:
62:
59:
55:
54:
41:
33:
32:
15:
13:
10:
9:
6:
4:
3:
2:
2348:
2337:
2334:
2332:
2329:
2327:
2324:
2322:
2319:
2317:
2314:
2312:
2309:
2307:
2304:
2303:
2301:
2286:
2283:
2281:
2278:
2276:
2273:
2271:
2268:
2266:
2263:
2261:
2258:
2256:
2253:
2251:
2248:
2246:
2243:
2241:
2238:
2236:
2233:
2232:
2230:
2226:
2220:
2217:
2215:
2212:
2210:
2207:
2205:
2202:
2200:
2197:
2195:
2192:
2190:
2189:Evolution Day
2187:
2185:
2182:
2180:
2177:
2175:
2172:
2170:
2167:
2165:
2162:
2161:
2159:
2155:
2149:
2146:
2144:
2141:
2140:
2138:
2134:
2125:
2120:
2118:
2113:
2111:
2106:
2105:
2102:
2095:
2091:
2087:
2086:Ya-xiang Yuan
2083:
2080:
2078:
2075:
2073:
2070:
2068:
2065:
2063:
2060:
2058:
2055:
2053:
2050:
2049:
2045:
2028:
2022:
2019:
2014:
2008:
2005:
2000:
1996:
1989:
1986:
1981:
1980:
1972:
1969:
1957:
1953:
1946:
1943:
1930:
1926:
1920:
1917:
1904:
1900:
1895:
1888:
1885:
1880:
1876:
1870:
1867:
1862:
1856:
1848:
1841:
1838:
1825:
1821:
1817:
1811:
1808:
1795:
1791:
1790:
1785:
1778:
1775:
1771:
1758:
1754:
1747:
1743:
1737:
1734:
1722:
1718:
1717:
1709:
1706:
1693:
1692:
1684:
1681:
1669:
1665:
1659:
1657:
1653:
1640:
1636:
1630:
1627:
1614:
1608:
1605:
1592:
1585:
1582:
1569:
1563:
1560:
1547:
1543:
1539:
1532:
1529:
1516:
1512:
1506:
1503:
1490:
1486:
1480:
1477:
1464:
1460:
1454:
1451:
1446:
1445:
1440:
1433:
1430:
1425:
1421:
1417:
1413:
1409:
1405:
1404:Math Horizons
1401:
1394:
1391:
1379:
1375:
1368:
1365:
1353:
1349:
1342:
1339:
1326:
1320:
1317:
1305:
1301:
1294:
1291:
1279:
1275:
1269:
1266:
1254:
1250:
1244:
1241:
1229:
1225:
1221:
1214:
1211:
1198:
1194:
1188:
1185:
1180:
1179:
1171:
1164:
1161:
1149:
1145:
1141:
1135:
1132:
1120:
1119:
1114:
1107:
1104:
1098:
1093:
1089:
1085:
1078:
1071:
1068:
1063:
1059:
1053:
1050:
1047:
1043:
1040:
1034:
1032:
1028:
1023:
1019:
1013:
1010:
998:
997:
992:
985:
982:
969:
962:
960:
956:
949:
941:
935:
932:
925:
921:
920:Doomsday rule
918:
916:
913:
911:
908:
906:
903:
901:
898:
897:
893:
884:
879:
872:
867:
864:
857:
852:
847:
845:
842:
837:; it equals 2
836:
832:
831:circumference
828:
824:
820:
816:
812:
810:
805:
803:
799:
795:
779:
775:
771:
767:
765:
758:
753:
746:
744:
742:
739:
735:
731:
728:
725:In 2024, the
723:
721:
717:
713:
709:
707:
702:
698:
693:
691:
687:
681:
666:
662:
654:
653:throwing pies
650:
643:
639:
634:
627:
625:
613:
611:
607:
606:circumference
604:pie with the
603:
599:
598:Google Doodle
595:
591:
586:
584:
580:
576:
568:
566:
564:
556:
549:
544:
542:
538:
534:
533:pi recitation
530:
526:
525:Exploratorium
522:
521:San Francisco
518:
514:
506:
502:
496:
492:
488:
477:
472:
470:
465:
463:
458:
457:
455:
454:
449:
443:
441:
437:Six nines in
435:
433:
432:Basel problem
430:
428:
425:
424:
423:
422:
417:
412:
409:
407:
404:
403:
402:
401:
396:
391:
390:
386:
384:
381:
380:
379:
378:
373:
368:
365:
363:
360:
358:
355:
353:
350:
348:
345:
343:
340:
338:
337:William Jones
335:
333:
330:
328:
327:Seki Takakazu
325:
323:
320:
318:
315:
313:
310:
308:
305:
303:
300:
298:
295:
293:
290:
288:
285:
284:
283:
282:
277:
272:
269:
267:
264:
262:
259:
257:
254:
253:
252:
251:
246:
241:
240:Transcendence
238:
236:
235:Irrationality
233:
232:
231:
230:
225:
220:
217:
215:
214:Circumference
212:
210:
207:
206:
205:
204:
199:
196:
179:
178:
175:
168:
164:
160:
159:
151:
147:
143:
139:
135:
131:
120:
116:
113:
110:
106:
99:
95:
92:
88:
80:
76:
72:
68:
64:
61:United States
60:
56:
52:
51:San Francisco
48:
47:Exploratorium
44:
39:
34:
29:
26:
22:
2219:Yuri's Night
2213:
2031:. Retrieved
2021:
2007:
1998:
1988:
1978:
1971:
1959:. Retrieved
1955:
1945:
1933:. Retrieved
1929:the original
1919:
1907:. Retrieved
1898:
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1879:the original
1869:
1846:
1840:
1828:. Retrieved
1824:the original
1819:
1810:
1798:. Retrieved
1789:The Guardian
1787:
1777:
1768:
1761:. Retrieved
1756:
1752:
1736:
1725:, retrieved
1715:
1708:
1696:. Retrieved
1690:
1683:
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1667:
1643:. Retrieved
1638:
1629:
1617:. Retrieved
1607:
1595:. Retrieved
1584:
1572:. Retrieved
1562:
1550:. Retrieved
1546:the original
1531:
1519:. Retrieved
1515:the original
1505:
1493:. Retrieved
1489:the original
1479:
1467:. Retrieved
1462:
1453:
1442:
1437:Smith, K.N.
1432:
1407:
1403:
1400:"Pi Instant"
1393:
1381:. Retrieved
1377:
1367:
1355:. Retrieved
1351:
1341:
1329:. Retrieved
1319:
1307:. Retrieved
1303:
1293:
1281:. Retrieved
1277:
1268:
1256:. Retrieved
1252:
1243:
1231:. Retrieved
1223:
1213:
1201:. Retrieved
1197:the original
1187:
1176:
1163:
1151:. Retrieved
1134:
1122:. Retrieved
1116:
1106:
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1083:
1070:
1061:
1052:
1021:
1012:
1000:. Retrieved
996:The Guardian
994:
984:
972:. Retrieved
934:
843:
818:
814:
807:
806:
789:is a common
773:
769:
768:
763:
761:
724:
710:
694:
667:in English (
646:
614:
587:
572:
547:
545:
486:
485:
410:
387:
332:Takebe Kenko
271:Memorization
180:
90:Celebrations
74:Significance
69:Mathematical
25:
1830:January 30,
1673:February 9,
1552:January 24,
1203:January 31,
730:Matt Parker
659:, due to a
624:'s digits.
550:format, an
531:or holding
357:John Wrench
342:John Machin
297:Zu Chongzhi
2300:Categories
2179:Darwin Day
1800:August 15,
1763:August 15,
1727:August 30,
1258:October 9,
950:References
861:Pi Pie at
815:Two Pi Day
798:Archimedes
665:homophones
628:Observance
575:Larry Shaw
513:Larry Shaw
398:In culture
383:Chronology
287:Archimedes
227:Properties
125:2025-03-14
43:Larry Shaw
2033:March 13,
1935:March 14,
1909:March 14,
1855:cite book
1645:March 14,
1619:March 14,
1597:March 18,
1574:March 12,
1424:218542599
1410:(3): 22.
1383:March 13,
1357:March 14,
1283:March 19,
1233:March 14,
1228:CNET News
1153:March 13,
1124:March 18,
1002:March 14,
974:March 14,
819:month/day
774:day/month
764:month/day
583:physicist
548:day/month
302:Aryabhata
133:Frequency
2199:Mole Day
1903:Archived
1794:Archived
1721:archived
1542:NBC News
1521:July 22,
1495:July 22,
1331:July 22,
1309:July 22,
1249:"Pi Day"
1090:(8): 1.
1042:Archived
905:Mole Day
894:See also
778:fraction
610:diameter
193:26433...
161:Part of
112:March 14
96:eating,
2184:DNA Day
1956:The BMJ
1698:July 1,
1469:May 14,
1463:NBC DFW
848:Gallery
833:to its
784:⁄
577:at the
569:History
493:of the
375:History
307:Madhava
292:Liu Hui
182:3.14159
123: (
2214:Pi Day
2094:slides
2072:Pi Day
1961:May 2,
1444:Forbes
1422:
1352:Forbes
1062:UNESCO
835:radius
541:UNESCO
523:, the
489:is an
487:Pi Day
411:Pi Day
279:People
165:on the
136:Annual
31:Pi Day
1749:(PDF)
1420:S2CID
1173:(PDF)
1080:(PDF)
970:. CNN
926:Notes
686:pizza
248:Value
190:23846
187:89793
184:26535
2082:数学漫谈
2035:2022
1963:2023
1937:2018
1911:2018
1861:link
1832:2011
1802:2024
1765:2024
1759:(11)
1729:2024
1700:2024
1675:2019
1647:2020
1621:2018
1599:2012
1576:2012
1554:2008
1523:2013
1497:2013
1471:2022
1385:2014
1359:2019
1333:2014
1311:2014
1285:2018
1260:2012
1235:2009
1205:2011
1155:2011
1126:2011
1004:2016
976:2018
695:The
501:(pi)
201:Uses
144:1988
108:Date
66:Type
1999:CNN
1412:doi
1092:doi
827:tau
811:Day
809:Tau
706:tau
661:pun
649:pie
565:).
563:tau
561:or
529:pie
519:in
507:of
94:Pie
81:of
49:in
2326:Pi
2302::
1997:.
1954:.
1897:.
1857:}}
1853:{{
1818:.
1792:.
1786:.
1767:.
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1461:.
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1406:.
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1350:.
1302:.
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1226:.
1222:.
1175:.
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1115:.
1088:66
1086:.
1082:.
1060:.
1030:^
1020:.
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958:^
940:Pi
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782:22
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677:aɪ
651:,
612:.
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2116:t
2109:v
2096:)
2037:.
2015:.
2001:.
1982:.
1965:.
1939:.
1913:.
1863:)
1834:.
1804:.
1757:4
1677:.
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1525:.
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1473:.
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1426:.
1414::
1387:.
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1262:.
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1207:.
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1100:.
1094::
1006:.
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942:.
839:π
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680:/
674:p
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657:π
622:π
618:π
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554:π
509:π
499:π
475:e
468:t
461:v
447:π
439:π
173:π
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102:π
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