Row lenght – eXcco

per seats quantity

Inches
Meters

Flat inches sizes (2″ side slack each end)

Size→	18	19	20	21	22	23
Seats↓
1	22	23	24	25	26	27
2	40	42	44	46	48	50
3	58	61	64	67	70	73
4	76	80	84	88	92	96
5	94	99	104	109	114	119
6	112	118	124	130	136	142
7	130	137	144	151	158	165
8	148	156	164	172	180	188
9	166	175	184	193	202	211
10	184	194	204	214	224	234
11	202	213	224	235	246	257
12	220	232	244	256	268	280
13	238	251	264	277	290	303
14	256	270	284	298	312	326
15	274	289	304	319	334	349
16	292	308	324	340	356	372
17	310	327	344	361	378	395
18	328	346	364	382	400	418
19	346	365	384	403	422	441
20	364	384	404	424	444	464
21	382	403	424	445	466	487
22	400	422	444	466	488	510
23	418	441	464	487	510	533
24	436	460	484	508	532	556
Allowance	4"	total				↔

1/16″ sizes (2″ side slack each end)

Size→	19 11/16	20 11/16	21 11/16	22 5/8
Seats↓
1	23 11/16	24 11/16	25 11/16	26 5/8
2	43 3/8	45 3/8	47 3/8	49 1/4
3	63 1/16	66 1/16	69 1/16	71 7/8
4	82 3/4	86 3/4	90 3/4	94 1/2
5	102 7/16	107 7/16	112 7/16	117 1/8
6	122 1/8	128 1/8	134 1/8	139 3/4
7	141 13/16	148 13/16	155 13/16	162 3/8
8	161 1/2	169 1/2	177 1/2	185
9	181 3/16	190 3/16	199 3/16	207 5/8
10	200 7/8	210 7/8	220 7/8	230 1/4
11	220 9/16	231 9/16	242 9/16	252 7/8
12	240 1/4	252 1/4	264 1/4	275 1/2
13	259 15/16	272 15/16	285 15/16	298 1/8
14	279 5/8	293 5/8	307 5/8	320 3/4
15	299 5/16	314 5/16	329 5/16	343 3/8
16	319	335	351	366
17	338 11/16	355 11/16	372 11/16	388 5/8
18	358 3/8	376 3/8	394 3/8	411 1/4
19	378 1/16	397 1/16	416 1/16	433 7/8
20	397 3/4	417 3/4	437 3/4	456 1/2
21	417 7/16	438 7/16	459 7/16	479 1/8
22	437 1/8	459 1/8	481 1/8	501 3/4
23	456 13/16	479 13/16	502 13/16	524 3/8
24	476 1/2	500 1/2	524 1/2	547
Allowance	4"	total		↔

1/8″ sizes (2 1/2″ side slack each end)

Size→	19 1/8	20 1/8	21 1/8	22 1/8	23 1/8	24 1/8
Seats↓
1	24 1/8	25 1/8	26 1/8	27 1/8	28 1/8	29 1/8
2	43 1/4	45 1/4	47 1/4	49 1/4	51 1/4	53 1/4
3	62 3/8	65 3/8	68 3/8	71 3/8	74 3/8	77 3/8
4	81 1/2	85 1/2	89 1/2	93 1/2	97 1/2	101 1/2
5	100 5/8	105 5/8	110 5/8	115 5/8	120 5/8	125 5/8
6	119 3/4	125 3/4	131 3/4	137 3/4	143 3/4	149 3/4
7	138 7/8	145 7/8	152 7/8	159 7/8	166 7/8	173 7/8
8	158	166	174	182	190	198
9	177 1/8	186 1/8	195 1/8	204 1/8	213 1/8	222 1/8
10	196 1/4	206 1/4	216 1/4	226 1/4	236 1/4	246 1/4
11	215 3/8	226 3/8	237 3/8	248 3/8	259 3/8	270 3/8
12	234 1/2	246 1/2	258 1/2	270 1/2	282 1/2	294 1/2
13	253 5/8	266 5/8	279 5/8	292 5/8	305 5/8	318 5/8
14	272 3/4	286 3/4	300 3/4	314 3/4	328 3/4	342 3/4
15	291 7/8	306 7/8	321 7/8	336 7/8	351 7/8	366 7/8
16	311	327	343	359	375	391
17	330 1/8	347 1/8	364 1/8	381 1/8	398 1/8	415 1/8
18	349 1/4	367 1/4	385 1/4	403 1/4	421 1/4	439 1/4
19	368 3/8	387 3/8	406 3/8	425 3/8	444 3/8	463 3/8
20	387 1/2	407 1/2	427 1/2	447 1/2	467 1/2	487 1/2
21	406 5/8	427 5/8	448 5/8	469 5/8	490 5/8	511 5/8
22	425 3/4	447 3/4	469 3/4	491 3/4	513 3/4	535 3/4
23	444 7/8	467 7/8	490 7/8	513 7/8	536 7/8	559 7/8
24	464	488	512	536	560	584
Allowance	5"	total				↔

1/8″ sizes (3″ side slack each end)

Size→	19 1/8	20 1/8	21 1/8	22 1/8	23 1/8	24 1/8
Seats↓
1	25 1/8	26 1/8	27 1/8	28 1/8	29 1/8	30 1/8
2	44 1/4	46 1/4	48 1/4	50 1/4	52 1/4	54 1/4
3	63 3/8	66 3/8	69 3/8	72 3/8	75 3/8	78 3/8
4	82 1/2	86 1/2	90 1/2	94 1/2	98 1/2	102 1/2
5	101 5/8	106 5/8	111 5/8	116 5/8	121 5/8	126 5/8
6	120 3/4	126 3/4	132 3/4	138 3/4	144 3/4	150 3/4
7	139 7/8	146 7/8	153 7/8	160 7/8	167 7/8	174 7/8
8	159	167	175	183	191	199
9	178 1/8	187 1/8	196 1/8	205 1/8	214 1/8	223 1/8
10	197 1/4	207 1/4	217 1/4	227 1/4	237 1/4	247 1/4
11	216 3/8	227 3/8	238 3/8	249 3/8	260 3/8	271 3/8
12	235 1/2	247 1/2	259 1/2	271 1/2	283 1/2	295 1/2
13	254 5/8	267 5/8	280 5/8	293 5/8	306 5/8	319 5/8
14	273 3/4	287 3/4	301 3/4	315 3/4	329 3/4	343 3/4
15	292 7/8	307 7/8	322 7/8	337 7/8	352 7/8	367 7/8
16	312	328	344	360	376	392
17	331 1/8	348 1/8	365 1/8	382 1/8	399 1/8	416 1/8
18	350 1/4	368 1/4	386 1/4	404 1/4	422 1/4	440 1/4
19	369 3/8	388 3/8	407 3/8	426 3/8	445 3/8	464 3/8
20	388 1/2	408 1/2	428 1/2	448 1/2	468 1/2	488 1/2
21	407 5/8	428 5/8	449 5/8	470 5/8	491 5/8	512 5/8
22	426 3/4	448 3/4	470 3/4	492 3/4	514 3/4	536 3/4
23	445 7/8	468 7/8	491 7/8	514 7/8	537 7/8	560 7/8
24	465	489	513	537	561	585
Allowance	6"	total				↔

1/4″ sizes (2″ side slack each end)

Size→	19 1/4	20 1/4	21 1/4	22 1/4
Seats↓
1	23 1/4	24 1/4	25 1/4	26 1/4
2	42 1/2	44 1/2	46 1/2	48 1/2
3	61 3/4	64 3/4	67 3/4	70 3/4
4	81	85	89	93
5	100 1/4	105 1/4	110 1/4	115 1/4
6	119 1/2	125 1/2	131 1/2	137 1/2
7	138 3/4	145 3/4	152 3/4	159 3/4
8	158	166	174	182
9	177 1/4	186 1/4	195 1/4	204 1/4
10	196 1/2	206 1/2	216 1/2	226 1/2
11	215 3/4	226 3/4	237 3/4	248 3/4
12	235	247	259	271
13	254 1/4	267 1/4	280 1/4	293 1/4
14	273 1/2	287 1/2	301 1/2	315 1/2
15	292 3/4	307 3/4	322 3/4	337 3/4
16	312	328	344	360
17	331 1/4	348 1/4	365 1/4	382 1/4
18	350 1/2	368 1/2	386 1/2	404 1/2
19	369 3/4	388 3/4	407 3/4	426 3/4
20	389	409	429	449
21	408 1/4	429 1/4	450 1/4	471 1/4
22	427 1/2	449 1/2	471 1/2	493 1/2
23	446 3/4	469 3/4	492 3/4	515 3/4
24	466	490	514	538
Allowance	4"	total		↔

1/4″ step sizes 21 to 22 1/4″ (3″ side slack each end)

Size→	21	21 1/4	21 1/2	21 3/4	22	22 1/4
Seats↓
1	27	27 1/4	27 1/2	27 3/4	28	28 1/4
2	48	48 1/2	49	49 1/2	50	50 1/2
3	69	69 3/4	70 1/2	71 1/4	72	72 3/4
4	90	91	92	93	94	95
5	111	112 1/4	113 1/2	114 3/4	116	117 1/4
6	132	133 1/2	135	136 1/2	138	139 1/2
7	153	154 3/4	156 1/2	158 1/4	160	161 3/4
8	174	176	178	180	182	184
9	195	197 1/4	199 1/2	201 3/4	204	206 1/4
10	216	218 1/2	221	223 1/2	226	228 1/2
11	237	239 3/4	242 1/2	245 1/4	248	250 3/4
12	258	261	264	267	270	273
13	279	282 1/4	285 1/2	288 3/4	292	295 1/4
14	300	303 1/2	307	310 1/2	314	317 1/2
15	321	324 3/4	328 1/2	332 1/4	336	339 3/4
16	342	346	350	354	358	362
17	363	367 1/4	371 1/2	375 3/4	380	384 1/4
18	384	388 1/2	393	397 1/2	402	406 1/2
19	405	409 3/4	414 1/2	419 1/4	424	428 3/4
20	426	431	436	441	446	451
21	447	452 1/4	457 1/2	462 3/4	468	473 1/4
22	468	473 1/2	479	484 1/2	490	495 1/2
23	489	494 3/4	500 1/2	506 1/4	512	517 3/4
24	510	516	522	528	534	540
Allowance	6"	total				↔

1/4″ step sizes 22 1/2″ to 23 3/4″ (3″ side slack each end)

Size→	22 1/2	22 3/4	23	23 1/4	23 1/2	23 3/4
Seats↓
1	28 1/2	28 3/4	29	29 1/4	29 1/2	29 3/4
2	51	51 1/2	52	52 1/2	53	53 1/2
3	73 1/2	74 1/4	75	75 3/4	76 1/2	77 1/4
4	96	97	98	99	100	101
5	118 1/2	119 3/4	121	122 1/4	123 1/2	124 3/4
6	141	142 1/2	144	145 1/2	147	148 1/2
7	163 1/2	165 1/4	167	168 3/4	170 1/2	172 1/4
8	186	188	190	192	194	196
9	208 1/2	210 3/4	213	215 1/4	217 1/2	219 3/4
10	231	233 1/2	236	238 1/2	241	243 1/2
11	253 1/2	256 1/4	259	261 3/4	264 1/2	267 1/4
12	276	279	282	285	288	291
13	298 1/2	301 3/4	305	308 1/4	311 1/2	314 3/4
14	321	324 1/2	328	331 1/2	335	338 1/2
15	343 1/2	347 1/4	351	354 3/4	358 1/2	362 1/4
16	366	370	374	378	382	386
17	388 1/2	392 3/4	397	401 1/4	405 1/2	409 3/4
18	411	415 1/2	420	424 1/2	429	433 1/2
19	433 1/2	438 1/4	443	447 3/4	452 1/2	457 1/4
20	456	461	466	471	476	481
21	478 1/2	483 3/4	489	494 1/4	499 1/2	504 3/4
22	501	506 1/2	512	517 1/2	523	528 1/2
23	523 1/2	529 1/4	535	540 3/4	546 1/2	552 1/4
24	546	552	558	564	570	576
Allowance	6"	total				↔

1/4″ step sizes 24″ to 25″ (3″ and 3 1/2″ side slack each end)

Size→	24	24	24 1/4	24 1/2	24 3/4	25
Seats↓
1	30	31	31 1/4	31 1/2	31 3/4	32
2	54	55	55 1/2	56	56 1/2	57
3	78	79	79 3/4	80 1/2	81 1/4	82
4	102	103	104	105	106	107
5	126	127	128 1/4	129 1/2	130 3/4	132
6	150	151	152 1/2	154	155 1/2	157
7	174	175	176 3/4	178 1/2	180 1/4	182
8	198	199	201	203	205	207
9	222	223	225 1/4	227 1/2	229 3/4	232
10	246	247	249 1/2	252	254 1/2	257
11	270	271	273 3/4	276 1/2	279 1/4	282
12	294	295	298	301	304	307
13	318	319	322 1/4	325 1/2	328 3/4	332
14	342	343	346 1/2	350	353 1/2	357
15	366	367	370 3/4	374 1/2	378 1/4	382
16	390	391	395	399	403	407
17	414	415	419 1/4	423 1/2	427 3/4	432
18	438	439	443 1/2	448	452 1/2	457
19	462	463	467 3/4	472 1/2	477 1/4	482
20	486	487	492	497	502	507
21	510	511	516 1/4	521 1/2	526 3/4	532
22	534	535	540 1/2	546	551 1/2	557
23	558	559	564 3/4	570 1/2	576 1/4	582
24	582	583	589	595	601	607
Allowance	6"	7"	7"	7"	7"	7"

1/4″ step sizes 25 1/4″ to 27 1/4″ (3 1/2″ and 2 7/8″ side slack each end)

Size→	25 1/4	25 1/2	25 3/4	26	27 1/4
Seats↓
1	32 1/4	32 1/2	32 3/4	33	33
2	57 1/2	58	58 1/2	59	60 1/4
3	82 3/4	83 1/2	84 1/4	85	87 1/2
4	108	109	110	111	114 3/4
5	133 1/4	134 1/2	135 3/4	137	142
6	158 1/2	160	161 1/2	163	169 1/4
7	183 3/4	185 1/2	187 1/4	189	196 1/2
8	209	211	213	215	223 3/4
9	234 1/4	236 1/2	238 3/4	241	251
10	259 1/2	262	264 1/2	267	278 1/4
11	284 3/4	287 1/2	290 1/4	293	305 1/2
12	310	313	316	319	332 3/4
13	335 1/4	338 1/2	341 3/4	345	360
14	360 1/2	364	367 1/2	371	387 1/4
15	385 3/4	389 1/2	393 1/4	397	414 1/2
16	411	415	419	423	441 3/4
17	436 1/4	440 1/2	444 3/4	449	469
18	461 1/2	466	470 1/2	475	496 1/4
19	486 3/4	491 1/2	496 1/4	501	523 1/2
20	512	517	522	527	550 3/4
21	537 1/4	542 1/2	547 3/4	553	578
22	562 1/2	568	573 1/2	579	605 1/4
23	587 3/4	593 1/2	599 1/4	605	632 1/2
24	613	619	625	631	659 3/4
Allowance	7"	7"	7"	7"	5 3/4"

Flat inches sizes (2″ side slack each end)

Size (m)→	0.457	0.483	0.508	0.533	0.559	0.584
Size (")→	18	19	20	21	22	23
Seats↓
1	0.559	0.584	0.610	0.635	0.660	0.686
2	1.016	1.067	1.118	1.168	1.219	1.270
3	1.473	1.549	1.626	1.702	1.778	1.854
4	1.930	2.032	2.134	2.235	2.337	2.438
5	2.388	2.515	2.642	2.769	2.896	3.023
6	2.845	2.997	3.150	3.302	3.454	3.607
7	3.302	3.480	3.658	3.835	4.013	4.191
8	3.759	3.962	4.166	4.369	4.572	4.775
9	4.216	4.445	4.674	4.902	5.131	5.359
10	4.674	4.928	5.182	5.436	5.690	5.944
11	5.131	5.410	5.690	5.969	6.248	6.528
12	5.588	5.893	6.198	6.502	6.807	7.112
13	6.045	6.375	6.706	7.036	7.366	7.696
14	6.502	6.858	7.214	7.569	7.925	8.280
15	6.960	7.341	7.722	8.103	8.484	8.865
16	7.417	7.823	8.230	8.636	9.042	9.449
17	7.874	8.306	8.738	9.169	9.601	10.033
18	8.331	8.788	9.246	9.703	10.160	10.617
19	8.788	9.271	9.754	10.236	10.719	11.201
20	9.246	9.754	10.262	10.770	11.278	11.786
21	9.703	10.236	10.770	11.303	11.836	12.370
22	10.160	10.719	11.278	11.836	12.395	12.954
23	10.617	11.201	11.786	12.370	12.954	13.538
24	11.074	11.684	12.294	12.903	13.513	14.122
Allowance	4"	0.102	meters	total		↔

1/16″ sizes (2″ side slack each end)

Size (m)→	0.500	0.525	0.551	0.575
Size (")→	19 11/16	20 11/16	21 11/16	22 5/8
Seats↓
1	0.602	0.627	0.652	0.676
2	1.102	1.153	1.203	1.251
3	1.602	1.678	1.754	1.826
4	2.102	2.203	2.305	2.400
5	2.602	2.729	2.856	2.975
6	3.102	3.254	3.407	3.550
7	3.602	3.780	3.958	4.124
8	4.102	4.305	4.509	4.699
9	4.602	4.831	5.059	5.274
10	5.102	5.356	5.610	5.848
11	5.602	5.882	6.161	6.423
12	6.102	6.407	6.712	6.998
13	6.602	6.933	7.263	7.572
14	7.102	7.458	7.814	8.147
15	7.603	7.984	8.365	8.722
16	8.103	8.509	8.915	9.296
17	8.603	9.034	9.466	9.871
18	9.103	9.560	10.017	10.446
19	9.603	10.085	10.568	11.020
20	10.103	10.611	11.119	11.595
21	10.603	11.136	11.670	12.170
22	11.103	11.662	12.221	12.744
23	11.603	12.187	12.771	13.319
24	12.103	12.713	13.322	13.894
Allowance	4"	0.102	meters	total

1/8″ sizes (2 1/2″ side slack each end)

Size (m)→	0.486	0.511	0.537	0.562	0.587	0.613
Size (")→	19 1/8	20 1/8	21 1/8	22 1/8	23 1/8	24 1/8
Seats↓
1	0.613	0.638	0.664	0.689	0.714	0.740
2	1.099	1.149	1.200	1.251	1.302	1.353
3	1.584	1.661	1.737	1.813	1.889	1.965
4	2.070	2.172	2.273	2.375	2.477	2.578
5	2.556	2.683	2.810	2.937	3.064	3.191
6	3.042	3.194	3.346	3.499	3.651	3.804
7	3.527	3.705	3.883	4.061	4.239	4.416
8	4.013	4.216	4.420	4.623	4.826	5.029
9	4.499	4.728	4.956	5.185	5.413	5.642
10	4.985	5.239	5.493	5.747	6.001	6.255
11	5.471	5.750	6.029	6.309	6.588	6.868
12	5.956	6.261	6.566	6.871	7.176	7.480
13	6.442	6.772	7.102	7.433	7.763	8.093
14	6.928	7.283	7.639	7.995	8.350	8.706
15	7.414	7.795	8.176	8.557	8.938	9.319
16	7.899	8.306	8.712	9.119	9.525	9.931
17	8.385	8.817	9.249	9.681	10.112	10.544
18	8.871	9.328	9.785	10.243	10.700	11.157
19	9.357	9.839	10.322	10.805	11.287	11.770
20	9.843	10.351	10.859	11.367	11.875	12.383
21	10.328	10.862	11.395	11.928	12.462	12.995
22	10.814	11.373	11.932	12.490	13.049	13.608
23	11.300	11.884	12.468	13.052	13.637	14.221
24	11.786	12.395	13.005	13.614	14.224	14.834
Allowance	5"	0.127	meters	total		↔

1/8″ sizes (3″ side slack each end)

Size (m)→	0.486	0.511	0.537	0.562	0.587	0.613
Size (")→	19 1/8	20 1/8	21 1/8	22 1/8	23 1/8	24 1/8
Seats↓
1	0.638	0.664	0.689	0.714	0.740	0.765
2	1.124	1.175	1.226	1.276	1.327	1.378
3	1.610	1.686	1.762	1.838	1.915	1.991
4	2.096	2.197	2.299	2.400	2.502	2.604
5	2.581	2.708	2.835	2.962	3.089	3.216
6	3.067	3.219	3.372	3.524	3.677	3.829
7	3.553	3.731	3.908	4.086	4.264	4.442
8	4.039	4.242	4.445	4.648	4.851	5.055
9	4.524	4.753	4.982	5.210	5.439	5.667
10	5.010	5.264	5.518	5.772	6.026	6.280
11	5.496	5.775	6.055	6.334	6.614	6.893
12	5.982	6.287	6.591	6.896	7.201	7.506
13	6.467	6.798	7.128	7.458	7.788	8.118
14	6.953	7.309	7.664	8.020	8.376	8.731
15	7.439	7.820	8.201	8.582	8.963	9.344
16	7.925	8.331	8.738	9.144	9.550	9.957
17	8.411	8.842	9.274	9.706	10.138	10.570
18	8.896	9.354	9.811	10.268	10.725	11.182
19	9.382	9.865	10.347	10.830	11.313	11.795
20	9.868	10.376	10.884	11.392	11.900	12.408
21	10.354	10.887	11.420	11.954	12.487	13.021
22	10.839	11.398	11.957	12.516	13.075	13.633
23	11.325	11.909	12.494	13.078	13.662	14.246
24	11.811	12.421	13.030	13.640	14.249	14.859
Allowance	6"	0.152	meters	total		↔

1/4″ sizes (2″ side slack each end)

Size (m)→	0.489	0.514	0.540	0.565
Size (")→	19 1/4	20 1/4	21 1/4	22 1/4
Seats↓
1	0.591	0.616	0.641	0.667
2	1.080	1.130	1.181	1.232
3	1.568	1.645	1.721	1.797
4	2.057	2.159	2.261	2.362
5	2.546	2.673	2.800	2.927
6	3.035	3.188	3.340	3.493
7	3.524	3.702	3.880	4.058
8	4.013	4.216	4.420	4.623
9	4.502	4.731	4.959	5.188
10	4.991	5.245	5.499	5.753
11	5.480	5.759	6.039	6.318
12	5.969	6.274	6.579	6.883
13	6.458	6.788	7.118	7.449
14	6.947	7.303	7.658	8.014
15	7.436	7.817	8.198	8.579
16	7.925	8.331	8.738	9.144
17	8.414	8.846	9.277	9.709
18	8.903	9.360	9.817	10.274
19	9.392	9.874	10.357	10.839
20	9.881	10.389	10.897	11.405
21	10.370	10.903	11.436	11.970
22	10.859	11.417	11.976	12.535
23	11.347	11.932	12.516	13.100
24	11.836	12.446	13.056	13.665
Allowance	4"	0.102	meters	↔

1/4″ step sizes 21 to 22 1/4″ (3″ side slack each end)

Size (m)→	0.533	0.540	0.546	0.552	0.559	0.565
Size (")→	21	21 1/4	21 1/2	21 3/4	22	22 1/4
Seats↓
1	0.686	0.692	0.699	0.705	0.711	0.718
2	1.219	1.232	1.245	1.257	1.270	1.283
3	1.753	1.772	1.791	1.810	1.829	1.848
4	2.286	2.311	2.337	2.362	2.388	2.413
5	2.819	2.851	2.883	2.915	2.946	2.978
6	3.353	3.391	3.429	3.467	3.505	3.543
7	3.886	3.931	3.975	4.020	4.064	4.108
8	4.420	4.470	4.521	4.572	4.623	4.674
9	4.953	5.010	5.067	5.124	5.182	5.239
10	5.486	5.550	5.613	5.677	5.740	5.804
11	6.020	6.090	6.160	6.229	6.299	6.369
12	6.553	6.629	6.706	6.782	6.858	6.934
13	7.087	7.169	7.252	7.334	7.417	7.499
14	7.620	7.709	7.798	7.887	7.976	8.065
15	8.153	8.249	8.344	8.439	8.534	8.630
16	8.687	8.788	8.890	8.992	9.093	9.195
17	9.220	9.328	9.436	9.544	9.652	9.760
18	9.754	9.868	9.982	10.097	10.211	10.325
19	10.287	10.408	10.528	10.649	10.770	10.890
20	10.820	10.947	11.074	11.201	11.328	11.455
21	11.354	11.487	11.621	11.754	11.887	12.021
22	11.887	12.027	12.167	12.306	12.446	12.586
23	12.421	12.567	12.713	12.859	13.005	13.151
24	12.954	13.106	13.259	13.411	13.564	13.716
Allowance	6"	0.152	meters	total		↔

1/4″ step sizes 22 1/2″ to 23 3/4″ (3″ side slack each end)

Size (m)→	0.572	0.578	0.584	0.591	0.597	0.603
Size (")→	22 1/2	22 3/4	23	23 1/4	23 1/2	23 3/4
Seats↓
1	0.724	0.730	0.737	0.743	0.749	0.756
2	1.295	1.308	1.321	1.334	1.346	1.359
3	1.867	1.886	1.905	1.924	1.943	1.962
4	2.438	2.464	2.489	2.515	2.540	2.565
5	3.010	3.042	3.073	3.105	3.137	3.169
6	3.581	3.620	3.658	3.696	3.734	3.772
7	4.153	4.197	4.242	4.286	4.331	4.375
8	4.724	4.775	4.826	4.877	4.928	4.978
9	5.296	5.353	5.410	5.467	5.525	5.582
10	5.867	5.931	5.994	6.058	6.121	6.185
11	6.439	6.509	6.579	6.648	6.718	6.788
12	7.010	7.087	7.163	7.239	7.315	7.391
13	7.582	7.664	7.747	7.830	7.912	7.995
14	8.153	8.242	8.331	8.420	8.509	8.598
15	8.725	8.820	8.915	9.011	9.106	9.201
16	9.296	9.398	9.500	9.601	9.703	9.804
17	9.868	9.976	10.084	10.192	10.300	10.408
18	10.439	10.554	10.668	10.782	10.897	11.011
19	11.011	11.132	11.252	11.373	11.494	11.614
20	11.582	11.709	11.836	11.963	12.090	12.217
21	12.154	12.287	12.421	12.554	12.687	12.821
22	12.725	12.865	13.005	13.145	13.284	13.424
23	13.297	13.443	13.589	13.735	13.881	14.027
24	13.868	14.021	14.173	14.326	14.478	14.630
Allowance	6"	0.152	meters	total		↔

1/4″ step sizes 24″ to 25″ (3″ and 3 1/2″ side slack each end)

Size (m)→	0.610	0.610	0.616	0.622	0.629	0.635
Size (")→	24	24	24 1/4	24 1/2	24 3/4	25
Seats↓
1	0.762	0.787	0.794	0.800	0.806	0.813
2	1.372	1.397	1.410	1.422	1.435	1.448
3	1.981	2.007	2.026	2.045	2.064	2.083
4	2.591	2.616	2.642	2.667	2.692	2.718
5	3.200	3.226	3.258	3.289	3.321	3.353
6	3.810	3.835	3.874	3.912	3.950	3.988
7	4.420	4.445	4.489	4.534	4.578	4.623
8	5.029	5.055	5.105	5.156	5.207	5.258
9	5.639	5.664	5.721	5.779	5.836	5.893
10	6.248	6.274	6.337	6.401	6.464	6.528
11	6.858	6.883	6.953	7.023	7.093	7.163
12	7.468	7.493	7.569	7.645	7.722	7.798
13	8.077	8.103	8.185	8.268	8.350	8.433
14	8.687	8.712	8.801	8.890	8.979	9.068
15	9.296	9.322	9.417	9.512	9.608	9.703
16	9.906	9.931	10.033	10.135	10.236	10.338
17	10.516	10.541	10.649	10.757	10.865	10.973
18	11.125	11.151	11.265	11.379	11.494	11.608
19	11.735	11.760	11.881	12.002	12.122	12.243
20	12.344	12.370	12.497	12.624	12.751	12.878
21	12.954	12.979	13.113	13.246	13.379	13.513
22	13.564	13.589	13.729	13.868	14.008	14.148
23	14.173	14.199	14.345	14.491	14.637	14.783
24	14.783	14.808	14.961	15.113	15.265	15.418
Inches slack	6	7	7	7	7	7
Meters slack	0.152	0.178	0.178	0.178	0.178	0.178

1/4″ step sizes 25 1/4″ to 27 1/4″ (3 1/2″ and 2 7/8″ side slack each end)

Size (m)→	0.641	0.648	0.654	0.660	0.692
Size (")→	25 1/4	25 1/2	25 3/4	26	27 1/4
Seats↓
1	0.819	0.826	0.832	0.838	0.838
2	1.461	1.473	1.486	1.499	1.530
3	2.102	2.121	2.140	2.159	2.223
4	2.743	2.769	2.794	2.819	2.915
5	3.385	3.416	3.448	3.480	3.607
6	4.026	4.064	4.102	4.140	4.299
7	4.667	4.712	4.756	4.801	4.991
8	5.309	5.359	5.410	5.461	5.683
9	5.950	6.007	6.064	6.121	6.375
10	6.591	6.655	6.718	6.782	7.068
11	7.233	7.303	7.372	7.442	7.760
12	7.874	7.950	8.026	8.103	8.452
13	8.515	8.598	8.680	8.763	9.144
14	9.157	9.246	9.335	9.423	9.836
15	9.798	9.893	9.989	10.084	10.528
16	10.439	10.541	10.643	10.744	11.220
17	11.081	11.189	11.297	11.405	11.913
18	11.722	11.836	11.951	12.065	12.605
19	12.363	12.484	12.605	12.725	13.297
20	13.005	13.132	13.259	13.386	13.989
21	13.646	13.780	13.913	14.046	14.681
22	14.288	14.427	14.567	14.707	15.373
23	14.929	15.075	15.221	15.367	16.066
24	15.570	15.723	15.875	16.027	16.758
Inches slack	7	7	7	7	5 3/4
Meters slack	0.178	0.178	0.178	0.178	0.146

Parameters

Side slack: Extra space between the end standard of the row and the end of available space, given for drilling and assemble purposes.
Size: Spacing between chairs’ standards.
Seats: Seats quantity in row.
Allowance: It is the sum of side slack on both sides of the row.

These charts are giving the required space for a row according to seats size and required quantity.