How can I tell the size of a pen?

Each pen has the dimensions (and in some cases weight too) detailed on their individual webpage. Look for the "Dimensions" section under the images and description.

Here are some detailed dimensions of popular pens. More will be added as we go on.

Pen model	nib length	section length to threads*	section diameter max/min	barrel diameter max	barrel/section length	barrel plus posted cap length	weight

Aurora Talentum	22.2	22	10.6/10.0	13.9	110	137
Bexley BX802	22.9	21	10.7/9.5	12.9	102	133
Bexley Model 58	23.4	18.8	11.5/10.5	13.9	108	164
Bexley Poseidon	23.4	16.5	11.7/11.5	13.6	99	151
Bexley Imperial	23.4	21.6	11.1/9.9	14.9	113	-
Caran d'Ache Dunas	16.6	23.5	9.9/7.4	12.4	105	135
Caran d'Ache Leman	19.1	21	10.5/8.9	13.3	106		46
Conklin Mark Twain	22.8	21	11.6/9.6	12.3	107	146	27
Conway Stewart 58	19.4	19	10.5/8.6	11.9	101	142
Conway Stewart 100	23.3	17	11.3/10.3	13.1	103	144
Conway Stewart Capulet	23.3	18.8	10.0/9.3	10.7	108	151	12
Conway Stewart Collector's Edition	18.5	19	10.9/9.0	13.2	107	141
Conway Stewart Churchill	23.3	26	12.8/10.8	14.7	115	157	30
Conway Stewart Duro	23.3	20	11.4/10.0	12.7	108	148	20
Conway Stewart Brunel	23.3	22			111	-	84
Conway Stewart Belliver	23.3	17	10.1/11.3	13.3	114	142	36
Conway Stewart Raleigh	23.3	19	11.4/10.3	13.5	117	156	48
Conway Stewart Wellington	23.3	20	11.3/9.9	13.3	105	153
Conway Stewart Wordsworth	23.3		10.8/8.8	12.9	102	141
Lamy 2000	6.4	32	10.8/6.4	12.5	116	143	22
Lamy 2000M	6.4	32	10.8/6.4	12.5	116	143	54
Lamy Safari	17.0	35.5	12.1/9.6	12.2	112	149	17
Lamy AL-Star/Lx	17.0	35.5	12.1/9.6	12.2	112	149	20
Lamy Studio	17.0	30	11.6/8.5	12.3	112	138	31
Lamy dialog 3	16.3	-	13.5	13.5	139	-	46
Parker Duofold Centennial	23.2	21	10.9/9.8	13	105	150	28
Pelikan M200/M215/M250/M400	20.0	14.9	9.8/9.1	11.8	102	129	14
Pelikan M600	20.6	14.9	10.5/9.6	12.5	103	134	18
Pelikan M800	22.6	15.5	11.3/10.5	13.3	105	139	30
Pelikan M1000	27	17.9	12.1/11.4	14.3			34
Sailor 1911	22.3	17	11.6/10.3	13.2	102	131	18
Sailor 1911 Realo	22.3	18	11.6/10.3	13.2	98	132	21
Sailor King of Pen	26.5	17.5	13.0/12.1	15.3	106		36
Sailor King Professional Gear	26.5	17.5	13.0/12.1	15.2	109	135	36
Sailor Pro Color/Shikiroi Hisakata	19.6	16.8	10.3/9.4	12.1	97	137	16.3
Sailor Professional Gear	22.3	17	11.6/10.3	13.2	94	127	20
Sailor Sapporo/ Pro Gear Slim	19.9	17	10.3/9.3	12.0	90	123	18
TWSBI Diamond 580	18.2	21	10.0/9.3	13.1	111	157	29
Yard-O-Led Retro Grand	23	30	12.0/9.3	14	114	146	66
Yard-O-Led Retro standard	17.1	23	8.6/7.6	10.9	105	142	24
Yard-O-Led Viceroy standard	17.3	24	8.9/7.6	9.6	106	139	32
Yard-O-Led Viceroy Grand	23	30	12.0/9.3	13.2	116		66
Yard-O-Led Viceroy pocket	17.6	6	8.9/7.2	9.8	77	110	26
Yard-O-Led Corinthian	17.5	24	9.9/7.5	11.3	108	-	52

* on pens with a clip-on cap (eg Yard-O-Led and Lamy) this measurement is to the part where the cap clips on

Note: the above figures are actual measured dimensions in mm and weight in g. They may differ slightly from the manufacturer's published figures.

Below are images of some popular fountain pens for a visual size comparison.

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How can I tell the size of a pen?