How to weigh a giant pumpkin

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 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 on 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.

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

This is the formula

Weight_lbs=(((14.2/(1+7.3*2^(-(OTT_inches/96)))^3+((OTT_inches)/51^2.91)-8)*0.993

In searching the internet, someone has created a nice webpage where you can add your measurements and see your weight.  Giant Pumpkin Weight Estimator

2017 Giant Pumpkin Weight Estimation Charts

Provided are two metric and imperial charts in PDF.

2017 Giant Pumpkin Weight Estimation Chart Pounds
2017 Giant Pumpkin Weight Estimation Chart Kilos

Please note:

These measurements are only for the Atlantic Giant variety of pumpkins. These weight estimation charts are intended as a rough guide only.  This is the best and current method for estimating a pumpkin’s weight, but will not replace actually weighing your pumpkin on a proper set of calibrated scales.

Below is our archive weight estimation chart that has been used over the years.  Please use the 2017 Giant Pumpkin Weight Estimation charts above.

Table 1: Over-the-Top Inches vs. Estimated Weight
Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.
91	21.4	121	44	151	79	181	130	211	199	241	290	271	407	301	552	331	729	361	941	391	1192
92	22.0	122	45	152	81	182	132	212	201	242	293	272	411	302	557	332	735	362	949	392	1201
93	22.6	123	46	153	82	183	134	213	204	243	297	273	415	303	562	333	742	363	956	393	1210
94	23.2	124	47	154	84	184	136	214	207	244	300	274	420	304	568	334	748	364	964	394	1219
95	23.9	125	48	155	85	185	138	215	210	245	304	275	424	305	573	335	755	365	972	395	1228
96	24.5	126	49	156	86	186	140	216	212	246	308	276	429	306	579	336	762	366	980	396	1238
97	25.2	127	50	157	88	187	142	217	215	247	311	277	433	307	584	337	768	367	988	397	1247
98	25.8	128	51	158	89	188	144	218	218	248	315	278	438	308	590	338	775	368	996	398	1256
99	26.5	129	52	159	91	189	146	219	221	249	318	279	442	309	596	339	782	369	1004	399	1266
100	27.2	130	53	160	93	190	148	220	224	250	322	280	447	310	601	340	789	370	1012	400	1275
101	27.9	131	54	161	94	191	150	221	227	251	326	281	452	311	607	341	795	371	1020	401	1284
102	28.6	132	55	162	96	192	153	222	230	252	330	282	456	312	613	342	802	372	1028	402	1294
103	29.3	133	57	163	97	193	155	223	232	253	333	283	461	313	618	343	809	373	1036	403	1304
104	30.0	134	58	164	99	194	157	224	235	254	337	284	466	314	624	344	816	374	1045	404	1313
105	30.8	135	59	165	101	195	159	225	238	255	341	285	470	315	630	345	823	375	1053	405	1323
106	31.5	136	60	166	102	196	162	226	241	256	345	286	475	316	636	346	830	376	1061	406	1333
107	32.3	137	61	167	104	197	164	227	244	257	349	287	480	317	642	347	837	377	1070	407	1342
108	33.1	138	62	168	106	198	166	228	248	258	353	288	485	318	648	348	844	378	1078	408	1352
109	33.8	139	64	169	107	199	169	229	251	259	357	289	490	319	654	349	852	379	1087	409	1362
110	34.6	140	65	170	109	200	171	230	254	260	361	290	495	320	660	350	859	380	1095	410	1372
111	35.5	141	66	171	111	201	173	231	257	261	365	291	500	321	666	351	866	381	1104	411	1382
112	36.3	142	67	172	113	202	176	232	260	262	369	292	505	322	672	352	873	382	1112	412	1392
113	37.1	143	69	173	115	203	178	233	263	263	373	293	510	323	678	353	881	383	1121	413	1402
114	38.0	144	70	174	116	204	181	234	267	264	377	294	515	324	684	354	888	384	1130	414	1412
115	38.8	145	71	175	118	205	183	235	270	265	381	295	520	325	691	355	896	385	1138	415	1422
116	39.7	146	72	176	120	206	186	236	273	266	385	296	525	326	697	356	903	386	1147	416	1433
117	40.6	147	74	177	122	207	188	237	276	267	389	297	531	327	703	357	911	387	1156	417	1443
118	41.5	148	75	178	124	208	191	238	280	268	394	298	536	328	709	358	918	388	1165	418	1453
119	42.4	149	76	179	126	209	194	239	283	269	398	299	541	329	716	359	926	389	1174	419	1463
120	43.3	150	78	180	128	210	196	240	287	270	402	300	546	330	722	360	933	390	1183	420	1474
Table 2: Circumference vs. Estimated Weight
Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.	Inches	Lbs.
31	16.5	51	50.7	71	108	91	198	111	329	131	516	151	753	171	1135	Tables prepared
32	17.8	52	53	72	112	92	204	112	337	132	527	152	768	172	1160	by
33	19.1	53	55.3	73	116	93	209	113	345	133	537	153	783	173	1186	DAVID MARTIN
34	20.5	54	57.7	74	119	94	215	114	353	134	548	154	798	174	1212
35	21.9	55	60.1	75	123	95	221	115	361	135	558	155	814	175	1239	from equations
36	23.4	56	62.6	76	127	96	227	116	369	136	569	156	830	176	1267	obtained from
37	24.8	57	65.2	77	131	97	233	117	378	137	580	157	847	177	1296	data provided by
38	26.4	58	67.8	78	136	98	239	118	386	138	591	158	864	178	1326	L.B. Stellpflug
39	28	59	70.5	79	140	99	245	119	395	139	602	159	881	179	1356
40	29.6	60	73.2	80	144	100	251	120	404	140	613	160	899	180	1387
41	31.3	61	76	81	149	101	258	121	413	141	625	161	918	181	1419	January 2001
42	33	62	78.9	82	153	102	264	122	423	142	636	162	937	182	1452
43	34.7	63	81.9	83	158	103	271	123	434	143	648	163	956	183	1486
44	36.6	64	84.9	84	162	104	278	124	444	144	660	164	977	184	1520	David Martin
45	38.4	65	88	85	167	105	285	125	455	145	673	165	997	185	1556
46	40.3	66	91.2	86	172	106	292	126	465	146	685	166	1019	186	1592
47	42.3	67	94.5	87	177	107	299	127	475	147	698	167	1041	187	1629
48	44.3	68	97.8	88	182	108	306	128	486	148	711	168	1063	188	1668	L. B. Stellpflug
49	46.4	69	101	89	187	109	314	129	496	149	725	169	1086	189	1707
50	48.5	70	105	90	193	110	321	130	506	150	739	170	1110	190	1747

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 blossoming 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 the 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 %	0.485	0.302
± 5.01 to ± 10%	0.273	0.24
± 10.01 % to ± 15 %	0.163	0.196
Over ± 15.01%	0.079	0.262

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

Inches	Lbs.
91	22.6
92	23.2
93	23.8
94	24.5
95	25.2
96	25.8
97	26.5
98	27.2
99	27.9
100	28.7
101	29.4
102	30.1
103	30.9
104	31.7
105	32.4
106	33.2
107	34
108	34.8
109	35.7
110	36.5
111	37.4
112	38.2
113	39.1
114	40
115	40.9
116	41.8
117	42.7
118	43.7
119	44.6
120	45.6
121	46.6
122	47.6
123	48.6
124	49.6
125	50.7
126	51.7
127	52.8
128	53.9
129	55
130	56.1
131	57.2
132	58.3
133	59.5
134	60.7
135	61.9
136	63.1
137	64.3
138	65.5
139	66.8
140	68.1
141	69.3
142	70.6
143	72
144	73.3
145	74.7
146	76
147	77.4
148	78.8
149	80.2
150	81.7
151	83
152	85
153	86
154	88
155	89
156	91
157	92
158	94
159	95
160	97
161	99
162	100
163	102
164	104
165	105
166	107
167	109
168	111
169	113
170	114
171	116
172	118
173	120
174	122
175	124
176	126
177	128
178	130
179	132
180	134
181	136
182	138
183	140
184	142
185	144
186	146
187	149
188	151
189	153
190	155
191	157
192	160
193	162
194	164
195	167
196	169
197	172
198	174
199	176
200	179
201	181
202	184
203	187
204	189
205	192
206	194
207	197
208	200
209	202
210	210
211	208
212	211
213	214
214	216
215	219
216	222
217	225
218	228
219	231
220	234
221	237
222	240
223	243
224	246
225	249
226	252
227	256
228	259
229	262
230	265
231	269
232	272
233	275
234	279
235	282
236	286
237	289
238	293
239	296
240	300
241	303
242	307
243	310
244	314
245	318
246	322
247	325
248	329
249	333
250	337
251	341
252	345
253	349
254	353
255	357
256	361
257	365
258	369
259	373
260	377
261	381
262	386
263	390
264	394
265	398
266	403
267	407
268	412
269	416
270	421
271	425
272	430
273	434
274	439
275	444
276	448
277	453
278	458
279	463
280	467
281	472
282	477
283	482
284	487
285	492
286	497
287	502
288	507
289	512
290	518
291	523
292	528
293	533
294	539
295	544
296	550
297	555
298	560
299	566
300	572
301	577
302	583
303	588
304	594
305	600
306	606
307	611
308	617
309	623
310	629
311	635
312	641
313	647
314	653
315	659
316	666
317	672
318	678
319	684
320	691
321	697
322	703
323	710
324	716
325	723
326	729
327	736
328	743
329	749
330	756
331	763
332	770
333	777
334	783
335	790
336	797
337	804
338	811
339	819
340	826
341	833
342	840
343	847
344	855
345	862
346	869
347	877
348	884
349	892
350	900
351	907
352	915
353	923
354	930
355	938
356	946
357	954
358	962
359	970
360	978
361	986
362	994
363	1002
364	1010
365	1019
366	1027
367	1035
368	1044
369	1052
370	1060
371	1069
372	1078
373	1086
374	1095
375	1104
376	1112
377	1121
378	1130
379	1139
380	1148
381	1157
382	1166
383	1175
384	1184
385	1193
386	12020
387	1212
388	1221
389	1230
390	1240
391	1249
392	1259
393	1269
394	1278
395	1288
396	1298
397	1307
398	1317
399	1327
400	1337
401	1347
402	1357
403	1367
404	1377
405	1387
406	1398
407	1408
408	1418
409	1429
410	1439
411	1450
412	1460
413	1471
414	1481
415	1492
416	1503
417	1514
418	1524
419	1535
420	1546

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