Convert inches to millimetres — table and converter

To convert inches to millimetres use the form or the table below.

Length in inches:
1 inch = 25.4 mm

See the definitions of an inch and a millimetre.
See the table for the reverse conversion from millimetres into inches.


Inches to millimetres
From 0 to 1 From 1 to 100 From 101 to 200
Inches Mm Inches Mm Inches Mm
0.01 0.254 1 25.4 101 2,565.4
0.02 0.508 2 50.8 102 2,590.8
0.03 0.762 3 76.2 103 2,616.2
0.04 1.016 4 101.6 104 2,641.6
0.05 1.270 5 127.0 105 2,667.0
0.06 1.524 6 152.4 106 2,692.4
0.07 1.778 7 177.8 107 2,717.8
0.08 2.032 8 203.2 108 2,743.2
0.09 2.286 9 228.6 109 2,768.6
0.10 2.540 10 254.0 110 2,794.0
0.11 2.794 11 279.4 111 2,819.4
0.12 3.048 12 304.8 112 2,844.8
0.13 3.302 13 330.2 113 2,870.2
0.14 3.556 14 355.6 114 2,895.6
0.15 3.810 15 381.0 115 2,921.0
0.16 4.064 16 406.4 116 2,946.4
0.17 4.318 17 431.8 117 2,971.8
0.18 4.572 18 457.2 118 2,997.2
0.19 4.826 19 482.6 119 3,022.6
0.20 5.080 20 508.0 120 3,048.0
0.21 5.334 21 533.4 121 3,073.4
0.22 5.588 22 558.8 122 3,098.8
0.23 5.842 23 584.2 123 3,124.2
0.24 6.096 24 609.6 124 3,149.6
0.25 6.350 25 635.0 125 3,175.0
Inches Mm Inches Mm Inches Mm
0.26 6.604 26 660.4 126 3,200.4
0.27 6.858 27 685.8 127 3,225.8
0.28 7.112 28 711.2 128 3,251.2
0.29 7.366 29 736.6 129 3,276.6
0.30 7.620 30 762.0 130 3,302.0
0.31 7.874 31 787.4 131 3,327.4
0.32 8.128 32 812.8 132 3,352.8
0.33 8.382 33 838.2 133 3,378.2
0.34 8.636 34 863.6 134 3,403.6
0.35 8.890 35 889.0 135 3,429.0
0.36 9.144 36 914.4 136 3,454.4
0.37 9.398 37 939.8 137 3,479.8
0.38 9.652 38 965.2 138 3,505.2
0.39 9.906 39 990.6 139 3,530.6
0.40 10.160 40 1,016.0 140 3,556.0
0.41 10.414 41 1,041.4 141 3,581.4
0.42 10.668 42 1,066.8 142 3,606.8
0.43 10.922 43 1,092.2 143 3,632.2
0.44 11.176 44 1,117.6 144 3,657.6
0.45 11.430 45 1,143.0 145 3,683.0
0.46 11.684 46 1,168.4 146 3,708.4
0.47 11.938 47 1,193.8 147 3,733.8
0.48 12.192 48 1,219.2 148 3,759.2
0.49 12.446 49 1,244.6 149 3,784.6
0.50 12.700 50 1,270.0 150 3,810.0
Inches Mm Inches Mm Inches Mm
0.51 12.954 51 1,295.4 151 3,835.4
0.52 13.208 52 1,320.8 152 3,860.8
0.53 13.462 53 1,346.2 153 3,886.2
0.54 13.716 54 1,371.6 154 3,911.6
0.55 13.970 55 1,397.0 155 3,937.0
0.56 14.224 56 1,422.4 156 3,962.4
0.57 14.478 57 1,447.8 157 3,987.8
0.58 14.732 58 1,473.2 158 4,013.2
0.59 14.986 59 1,498.6 159 4,038.6
0.60 15.240 60 1,524.0 160 4,064.0
0.61 15.494 61 1,549.4 161 4,089.4
0.62 15.748 62 1,574.8 162 4,114.8
0.63 16.002 63 1,600.2 163 4,140.2
0.64 16.256 64 1,625.6 164 4,165.6
0.65 16.510 65 1,651.0 165 4,191.0
0.66 16.764 66 1,676.4 166 4,216.4
0.67 17.018 67 1,701.8 167 4,241.8
0.68 17.272 68 1,727.2 168 4,267.2
0.69 17.526 69 1,752.6 169 4,292.6
0.70 17.780 70 1,778.0 170 4,318.0
0.71 18.034 71 1,803.4 171 4,343.4
0.72 18.288 72 1,828.8 172 4,368.8
0.73 18.542 73 1,854.2 173 4,394.2
0.74 18.796 74 1,879.6 174 4,419.6
0.75 19.050 75 1,905.0 175 4,445.0
Inches Mm Inches Mm Inches Mm
0.76 19.304 76 1,930.4 176 4,470.4
0.77 19.558 77 1,955.8 177 4,495.8
0.78 19.812 78 1,981.2 178 4,521.2
0.79 20.066 79 2,006.6 179 4,546.6
0.80 20.320 80 2,032.0 180 4,572.0
0.81 20.574 81 2,057.4 181 4,597.4
0.82 20.828 82 2,082.8 182 4,622.8
0.83 21.082 83 2,108.2 183 4,648.2
0.84 21.336 84 2,133.6 184 4,673.6
0.85 21.590 85 2,159.0 185 4,699.0
0.86 21.844 86 2,184.4 186 4,724.4
0.87 22.098 87 2,209.8 187 4,749.8
0.88 22.352 88 2,235.2 188 4,775.2
0.89 22.606 89 2,260.6 189 4,800.6
0.90 22.860 90 2,286.0 190 4,826.0
0.91 23.114 91 2,311.4 191 4,851.4
0.92 23.368 92 2,336.8 192 4,876.8
0.93 23.622 93 2,362.2 193 4,902.2
0.94 23.876 94 2,387.6 194 4,927.6
0.95 24.130 95 2,413.0 195 4,953.0
0.96 24.384 96 2,438.4 196 4,978.4
0.97 24.638 97 2,463.8 197 5,003.8
0.98 24.892 98 2,489.2 198 5,029.2
0.99 25.146 99 2,514.6 199 5,054.6
1.00 25.400 100 2,540.0 200 5,080.0
Inches Mm Inches Mm Inches Mm
Inches to millimetres
From 201 to 300 From 301 to 400 From 401 to 500
Inches Mm Inches Mm Inches Mm
201 5,105.4 301 7,645.4 401 10,185.4
202 5,130.8 302 7,670.8 402 10,210.8
203 5,156.2 303 7,696.2 403 10,236.2
204 5,181.6 304 7,721.6 404 10,261.6
205 5,207.0 305 7,747.0 405 10,287.0
206 5,232.4 306 7,772.4 406 10,312.4
207 5,257.8 307 7,797.8 407 10,337.8
208 5,283.2 308 7,823.2 408 10,363.2
209 5,308.6 309 7,848.6 409 10,388.6
210 5,334.0 310 7,874.0 410 10,414.0
211 5,359.4 311 7,899.4 411 10,439.4
212 5,384.8 312 7,924.8 412 10,464.8
213 5,410.2 313 7,950.2 413 10,490.2
214 5,435.6 314 7,975.6 414 10,515.6
215 5,461.0 315 8,001.0 415 10,541.0
216 5,486.4 316 8,026.4 416 10,566.4
217 5,511.8 317 8,051.8 417 10,591.8
218 5,537.2 318 8,077.2 418 10,617.2
219 5,562.6 319 8,102.6 419 10,642.6
220 5,588.0 320 8,128.0 420 10,668.0
221 5,613.4 321 8,153.4 421 10,693.4
222 5,638.8 322 8,178.8 422 10,718.8
223 5,664.2 323 8,204.2 423 10,744.2
224 5,689.6 324 8,229.6 424 10,769.6
225 5,715.0 325 8,255.0 425 10,795.0
Inches Mm Inches Mm Inches Mm
226 5,740.4 326 8,280.4 426 10,820.4
227 5,765.8 327 8,305.8 427 10,845.8
228 5,791.2 328 8,331.2 428 10,871.2
229 5,816.6 329 8,356.6 429 10,896.6
230 5,842.0 330 8,382.0 430 10,922.0
231 5,867.4 331 8,407.4 431 10,947.4
232 5,892.8 332 8,432.8 432 10,972.8
233 5,918.2 333 8,458.2 433 10,998.2
234 5,943.6 334 8,483.6 434 11,023.6
235 5,969.0 335 8,509.0 435 11,049.0
236 5,994.4 336 8,534.4 436 11,074.4
237 6,019.8 337 8,559.8 437 11,099.8
238 6,045.2 338 8,585.2 438 11,125.2
239 6,070.6 339 8,610.6 439 11,150.6
240 6,096.0 340 8,636.0 440 11,176.0
241 6,121.4 341 8,661.4 441 11,201.4
242 6,146.8 342 8,686.8 442 11,226.8
243 6,172.2 343 8,712.2 443 11,252.2
244 6,197.6 344 8,737.6 444 11,277.6
245 6,223.0 345 8,763.0 445 11,303.0
246 6,248.4 346 8,788.4 446 11,328.4
247 6,273.8 347 8,813.8 447 11,353.8
248 6,299.2 348 8,839.2 448 11,379.2
249 6,324.6 349 8,864.6 449 11,404.6
250 6,350.0 350 8,890.0 450 11,430.0
Inches Mm Inches Mm Inches Mm
251 6,375.4 351 8,915.4 451 11,455.4
252 6,400.8 352 8,940.8 452 11,480.8
253 6,426.2 353 8,966.2 453 11,506.2
254 6,451.6 354 8,991.6 454 11,531.6
255 6,477.0 355 9,017.0 455 11,557.0
256 6,502.4 356 9,042.4 456 11,582.4
257 6,527.8 357 9,067.8 457 11,607.8
258 6,553.2 358 9,093.2 458 11,633.2
259 6,578.6 359 9,118.6 459 11,658.6
260 6,604.0 360 9,144.0 460 11,684.0
261 6,629.4 361 9,169.4 461 11,709.4
262 6,654.8 362 9,194.8 462 11,734.8
263 6,680.2 363 9,220.2 463 11,760.2
264 6,705.6 364 9,245.6 464 11,785.6
265 6,731.0 365 9,271.0 465 11,811.0
266 6,756.4 366 9,296.4 466 11,836.4
267 6,781.8 367 9,321.8 467 11,861.8
268 6,807.2 368 9,347.2 468 11,887.2
269 6,832.6 369 9,372.6 469 11,912.6
270 6,858.0 370 9,398.0 470 11,938.0
271 6,883.4 371 9,423.4 471 11,963.4
272 6,908.8 372 9,448.8 472 11,988.8
273 6,934.2 373 9,474.2 473 12,014.2
274 6,959.6 374 9,499.6 474 12,039.6
275 6,985.0 375 9,525.0 475 12,065.0
Inches Mm Inches Mm Inches Mm
276 7,010.4 376 9,550.4 476 12,090.4
277 7,035.8 377 9,575.8 477 12,115.8
278 7,061.2 378 9,601.2 478 12,141.2
279 7,086.6 379 9,626.6 479 12,166.6
280 7,112.0 380 9,652.0 480 12,192.0
281 7,137.4 381 9,677.4 481 12,217.4
282 7,162.8 382 9,702.8 482 12,242.8
283 7,188.2 383 9,728.2 483 12,268.2
284 7,213.6 384 9,753.6 484 12,293.6
285 7,239.0 385 9,779.0 485 12,319.0
286 7,264.4 386 9,804.4 486 12,344.4
287 7,289.8 387 9,829.8 487 12,369.8
288 7,315.2 388 9,855.2 488 12,395.2
289 7,340.6 389 9,880.6 489 12,420.6
290 7,366.0 390 9,906.0 490 12,446.0
291 7,391.4 391 9,931.4 491 12,471.4
292 7,416.8 392 9,956.8 492 12,496.8
293 7,442.2 393 9,982.2 493 12,522.2
294 7,467.6 394 10,007.6 494 12,547.6
295 7,493.0 395 10,033.0 495 12,573.0
296 7,518.4 396 10,058.4 496 12,598.4
297 7,543.8 397 10,083.8 497 12,623.8
298 7,569.2 398 10,109.2 498 12,649.2
299 7,594.6 399 10,134.6 499 12,674.6
300 7,620.0 400 10,160.0 500 12,700.0
Inches Mm Inches Mm Inches Mm

Units of length: inch and millimetre

An inch (in or ″) is a unit of length within the imperial system of units, a system of weights and measures traditionally used throughout the British Empire.

The imperial system was officially replaced by the metric system in almost all countries. Nevertheless, it is still widely used in the United Kingdom, Canada, and some other members of the Commonwealth, as well as in the United States.

1 inch equals exactly 25.4 millimetres or 2.54 centimetres.

A millimetre (mm) is a unit of length within the metric system of units, which in its current form is called the International System of Units (SI).

The base unit of length in SI is the metre. The prefix milli means "one-thousandth", so 1 millimetre equals 0.001 metre or 0.1 centimetre.

1 millimetre is approximately equal to 0.03937 inches.