How to weigh a giant pumpkin

Competitive Grower Atlantic Giant Pumpkins 1990- 1995

How to weigh a pumpkin

To calculate your pumpkin weight, you need to obtain three measurements. If you have a large pumpkin, get a measuring tape longer than 100 inches. If you only have a metal measuring tape, be sure to get some string to be used as your measuring tape. Now let’s begin. Be sure to use the graphics below as a reference.

Measure the circumference of the fruit parallel to the ground at stem height. This is measurement number 1.

Now place your tape at the plant stem to the ground and to the blossom end to the ground. What is the distance from the ground to the ground? This is measurement number 2.

Now place your tape perpendicular to the plant stem at the widest portion of the pumpkin. Place the tape at the ground on both sides at this wide spot. Is it perpendicular to the plant stem? Now measure the distance from ground contact to ground contact. This is measurement number 3.

Add all three measurements and find the data in the inches column below and there is your weight.

If you would like to see your total weight using mathematical programs, select one of these two links.

Total measurement. This is a rough weight Offical details on how to measure

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Table 1: Over-the-Top Inches vs. Estimated Weight
InchesLbs.InchesLbs.InchesLbs.InchesLbs.InchesLbs.InchesLbs.InchesLbs.InchesLbs.InchesLbs.InchesLbs.InchesLbs.
9121.412144151791811302111992412902714073015523317293619413911192
9222.012245152811821322122012422932724113025573327353629493921201
9322.612346153821831342132042432972734153035623337423639563931210
9423.212447154841841362142072443002744203045683347483649643941219
9523.912548155851851382152102453042754243055733357553659723951228
9624.512649156861861402162122463082764293065793367623669803961238
9725.212750157881871422172152473112774333075843377683679883971247
9825.812851158891881442182182483152784383085903387753689963981256
9926.5129521599118914621922124931827944230959633978236910043991266
10027.2130531609319014822022425032228044731060134078937010124001275
10127.9131541619419115022122725132628145231160734179537110204011284
10228.6132551629619215322223025233028245631261334280237210284021294
10329.3133571639719315522323225333328346131361834380937310364031304
10430.0134581649919415722423525433728446631462434481637410454041313
10530.81355916510119515922523825534128547031563034582337510534051323
10631.51366016610219616222624125634528647531663634683037610614061333
10732.31376116710419716422724425734928748031764234783737710704071342
10833.11386216810619816622824825835328848531864834884437810784081352
10933.81396416910719916922925125935728949031965434985237910874091362
11034.61406517010920017123025426036129049532066035085938010954101372
11135.51416617111120117323125726136529150032166635186638111044111382
11236.31426717211320217623226026236929250532267235287338211124121392
11337.11436917311520317823326326337329351032367835388138311214131402
11438.01447017411620418123426726437729451532468435488838411304141412
11538.81457117511820518323527026538129552032569135589638511384151422
11639.71467217612020618623627326638529652532669735690338611474161433
11740.61477417712220718823727626738929753132770335791138711564171443
11841.51487517812420819123828026839429853632870935891838811654181453
11942.41497617912620919423928326939829954132971635992638911744191463
12043.31507818012821019624028727040230054633072236093339011834201474
                      
Table 2: Circumference vs. Estimated Weight      
InchesLbs.InchesLbs.InchesLbs.InchesLbs.InchesLbs.InchesLbs.InchesLbs.InchesLbs.      
3116.55150.771108911981113291315161517531711135Tables prepared
3217.8525372112922041123371325271527681721160by
3319.15355.373116932091133451335371537831731186DAVID MARTIN
3420.55457.774119942151143531345481547981741212      
3521.95560.175123952211153611355581558141751239from equations
3623.45662.676127962271163691365691568301761267obtained from
3724.85765.277131972331173781375801578471771296data provided by
3826.45867.878136982391183861385911588641781326L.B. Stellpflug
39285970.579140992451193951396021598811791356      
4029.66073.2801441002511204041406131608991801387      
4131.36176811491012581214131416251619181811419January 2001
42336278.9821531022641224231426361629371821452      
4334.76381.9831581032711234341436481639561831486      
4436.66484.9841621042781244441446601649771841520David Martin
4538.46588851671052851254551456731659971851556      
4640.36691.28617210629212646514668516610191861592      
4742.36794.58717710729912747514769816710411871629      
4844.36897.88818210830612848614871116810631881668L. B. Stellpflug
4946.4691018918710931412949614972516910861891707      
5048.5701059019311032113050615073917011101901747      

The Circumference Measurement should be taken where you have the LARGEST Circumference. It WILL NOT always be parallel to the ground. It may be above or below the stem and above or below the blossom point. On most large pumpkins the LARGEST Circumference IS NOT at the stem/blossom level. The LARGEST Circumference is necessary to obtain the most accurate Weight Estimate as most of the Circumference measurements used to obtain the Weight Equations were LARGEST Circumference

Updated measuring process and notes:

The last update was dated January 2003 based on 800 measurements from 2001 and 2002. I compared data for 1203 fruit grown in 2003 and 2004 with the 2001 and 2002 data. Fruit grown the last 2 years are heavier for the same size by approximately 3%. Therefore the equations used for the tables dated January 2005 are primarily based on 1203 fruit grown in 2003 and 2004. Most of the data was provided from the AGGC file by Mike Nepereny. The tables provide estimates for fruit down to 41 inch Circumference (approx. 30 pounds) and 91 inches Over-the-Top (approx. 21 pounds).

David Martin from Little Britain, Ontario used Multiple Regression Analysis to obtain equations that best fit the data I provided. He prepared the Weight Tables from those equations.

The OVER-THE-TOP method (TABLE 1) provides the BEST estimates but only about 76% will be within plus or minus 10%. This requires adding Circumference to the two Over-the-Top measurements taken from ground-to-ground from side-to-side and end-to-end.

TABLE 2 uses only the CIRCUMFERENCE measurement. It DOES NOT provide good estimates for unusually high, flat, long or short fruit. About 54% of the estimates will be within plus or minus 10%. It is useful to estimate day-to-day increases.

The Circumference measurement should be the LARGEST circumference taken approximately parallel to the ground. At weigh-offs I have found some growers are not measuring the largest Circumference which contributes to the variability. The OVER-TOP measurements from ground-to-ground in both directions must be over the highest point of the fruit. These must be taken straight down from the edges of the fruit.

EXAMPLE: Circumference = 175 inches (Table 2 estimate = 1185 pounds)
Side-to-side = 103 inches
End-to-end = 100 inches
Total = 378 inches (Table 1 estimate = 1130 pounds)
The actual weight was 1121 pounds.

Due to considerable variability in the “wall thickness” from fruit-to-fruit, neither method provides very reliable estimates but at present, we don’t have a better method. Here are the percents of your estimates that you can expect to be within the accuracy ranges shown (based on fruit grown in 2003 and 2004):

   
Accuracy range Table 1 (O.T.Table 2 (C)
± 5 % 0.4850.302
± 5.01 to ± 10% 0.2730.24
± 10.01 % to ± 15 % 0.1630.196
Over ± 15.01% 0.0790.262

NEW Tables compared to January 2003 Tables:
The new tables should provide better estimates as AVERAGE fruit weight for the same measurement increased by approximately 3% compared to 2001 and 2002 weights. The Circumference table should be much better at the higher weights as the previous table over-estimated above approximately 170-inch Circumference.

I will provide David Martin’s equations (4 terms) to anyone who wants to use them in a computer program. Write me at 1925 Middle Road, Rush, NY 14543-9732.

I have provided Tables to estimate weights since 1988. They were updated every 2 to 3 years. This is my LAST update. For the last 3 updates, I thank David Martin for using the data I provided to obtain the equations and preparing the Tables. Thank you to all the growers who provided me with measurements since 1987 and to Mike Nepereny for providing data from his AGGC file the last 4 years.

NOTE: Several people have attempted to obtain Weight Estimating equations using the RAW data available. All, that I know of, obtained equations that over-estimated below approximately 750 pounds and under-estimated above that due to a BIAS in the data. If anyone is interested, I will explain how I worked around the bias.
Leonard B. Stellpflug

InchesLbs.            
9122.6
9223.2
9323.8
9424.5
9525.2
9625.8
9726.5
9827.2
9927.9
10028.7
10129.4
10230.1
10330.9
10431.7
10532.4
10633.2
10734
10834.8
10935.7
11036.5
11137.4
11238.2
11339.1
11440
11540.9
11641.8
11742.7
11843.7
11944.6
12045.6
12146.6
12247.6
12348.6
12449.6
12550.7
12651.7
12752.8
12853.9
12955
13056.1
13157.2
13258.3
13359.5
13460.7
13561.9
13663.1
13764.3
13865.5
13966.8
14068.1
14169.3
14270.6
14372
14473.3
14574.7
14676
14777.4
14878.8
14980.2
15081.7
15183
15285
15386
15488
15589
15691
15792
15894
15995
16097
16199
162100
163102
164104
165105
166107
167109
168111
169113
170114
171116
172118
173120
174122
175124
176126
177128
178130
179132
180134
181136
182138
183140
184142
185144
186146
187149
188151
189153
190155
191157
192160
193162
194164
195167
196169
197172
198174
199176
200179
201181
202184
203187
204189
205192
206194
207197
208200
209202
210210
211208
212211
213214
214216
215219
216222
217225
218228
219231
220234
221237
222240
223243
224246
225249
226252
227256
228259
229262
230265
231269
232272
233275
234279
235282
236286
237289
238293
239296
240300
241303
242307
243310
244314
245318
246322
247325
248329
249333
250337
251341
252345
253349
254353
255357
256361
257365
258369
259373
260377
261381
262386
263390
264394
265398
266403
267407
268412
269416
270421
271425
272430
273434
274439
275444
276448
277453
278458
279463
280467
281472
282477
283482
284487
285492
286497
287502
288507
289512
290518
291523
292528
293533
294539
295544
296550
297555
298560
299566
300572
301577
302583
303588
304594
305600
306606
307611
308617
309623
310629
311635
312641
313647
314653
315659
316666
317672
318678
319684
320691
321697
322703
323710
324716
325723
326729
327736
328743
329749
330756
331763
332770
333777
334783
335790
336797
337804
338811
339819
340826
341833
342840
343847
344855
345862
346869
347877
348884
349892
350900
351907
352915
353923
354930
355938
356946
357954
358962
359970
360978
361986
362994
3631002
3641010
3651019
3661027
3671035
3681044
3691052
3701060
3711069
3721078
3731086
3741095
3751104
3761112
3771121
3781130
3791139
3801148
3811157
3821166
3831175
3841184
3851193
38612020
3871212
3881221
3891230
3901240
3911249
3921259
3931269
3941278
3951288
3961298
3971307
3981317
3991327
4001337
4011347
4021357
4031367
4041377
4051387
4061398
4071408
4081418
4091429
4101439
4111450
4121460
4131471
4141481
4151492
4161503
4171514
4181524
4191535
4201546

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