Comment convertir des mph en km/h ?
Multipliez par 1,609, le même facteur que pour les distances en miles. Au volant d'une voiture de location au Royaume-Uni, retenez trois repères : 30 mph ≈ 48 km/h en ville, 60 mph ≈ 97 km/h sur route, 70 mph ≈ 113 km/h sur autoroute.
km/h = mph × 1,609mph = km/h ÷ 1,609
Où ces deux unités servent
Le mille par heure règne sur les panneaux routiers des États-Unis et du Royaume-Uni, deux pays qui n'ont jamais achevé leur passage au métrique sur la route. Le kilomètre par heure figure sur les panneaux routiers de la quasi-totalité des pays, et c'est l'unité que lisent les compteurs de voiture hors monde anglo-saxon.
Limitations et vitesses courantes
| 20 mph (zone école UK) | 32 km/h |
| 25 mph (rue résidentielle américaine) | 40 km/h |
| 30 mph (ville UK) | 48 km/h |
| 45 mph | 72 km/h |
| 55 mph (highway US) | 89 km/h |
| 60 mph (route UK) | 97 km/h |
| 65 mph (highway US) | 105 km/h |
| 70 mph (autoroute UK) | 113 km/h |
| 75 mph (interstate de l'Ouest américain) | 121 km/h |
| 85 mph (SH 130 au Texas, record américain) | 137 km/h |
| 100 mph | 161 km/h |
Voir toutes les valeurs
- 1 mph = 1,609 km/h
- 2 mph = 3,219 km/h
- 3 mph = 4,828 km/h
- 4 mph = 6,437 km/h
- 5 mph = 8,047 km/h
- 6 mph = 9,656 km/h
- 7 mph = 11,265 km/h
- 8 mph = 12,875 km/h
- 9 mph = 14,484 km/h
- 10 mph = 16,093 km/h
- 11 mph = 17,703 km/h
- 12 mph = 19,312 km/h
- 13 mph = 20,921 km/h
- 14 mph = 22,531 km/h
- 15 mph = 24,14 km/h
- 16 mph = 25,75 km/h
- 17 mph = 27,359 km/h
- 18 mph = 28,968 km/h
- 19 mph = 30,578 km/h
- 20 mph = 32,187 km/h
- 21 mph = 33,796 km/h
- 22 mph = 35,406 km/h
- 23 mph = 37,015 km/h
- 24 mph = 38,624 km/h
- 25 mph = 40,234 km/h
- 26 mph = 41,843 km/h
- 27 mph = 43,452 km/h
- 28 mph = 45,062 km/h
- 29 mph = 46,671 km/h
- 30 mph = 48,28 km/h
- 31 mph = 49,89 km/h
- 32 mph = 51,499 km/h
- 33 mph = 53,108 km/h
- 34 mph = 54,718 km/h
- 35 mph = 56,327 km/h
- 36 mph = 57,936 km/h
- 37 mph = 59,546 km/h
- 38 mph = 61,155 km/h
- 39 mph = 62,764 km/h
- 40 mph = 64,374 km/h
- 41 mph = 65,983 km/h
- 42 mph = 67,592 km/h
- 43 mph = 69,202 km/h
- 44 mph = 70,811 km/h
- 45 mph = 72,42 km/h
- 46 mph = 74,03 km/h
- 47 mph = 75,639 km/h
- 48 mph = 77,249 km/h
- 49 mph = 78,858 km/h
- 50 mph = 80,467 km/h
- 51 mph = 82,077 km/h
- 52 mph = 83,686 km/h
- 53 mph = 85,295 km/h
- 54 mph = 86,905 km/h
- 55 mph = 88,514 km/h
- 56 mph = 90,123 km/h
- 57 mph = 91,733 km/h
- 58 mph = 93,342 km/h
- 59 mph = 94,951 km/h
- 60 mph = 96,561 km/h
- 61 mph = 98,17 km/h
- 62 mph = 99,779 km/h
- 63 mph = 101,389 km/h
- 64 mph = 102,998 km/h
- 65 mph = 104,607 km/h
- 66 mph = 106,217 km/h
- 67 mph = 107,826 km/h
- 68 mph = 109,435 km/h
- 69 mph = 111,045 km/h
- 70 mph = 112,654 km/h
- 71 mph = 114,263 km/h
- 72 mph = 115,873 km/h
- 73 mph = 117,482 km/h
- 74 mph = 119,091 km/h
- 75 mph = 120,701 km/h
- 76 mph = 122,31 km/h
- 77 mph = 123,919 km/h
- 78 mph = 125,529 km/h
- 79 mph = 127,138 km/h
- 80 mph = 128,748 km/h
- 81 mph = 130,357 km/h
- 82 mph = 131,966 km/h
- 83 mph = 133,576 km/h
- 84 mph = 135,185 km/h
- 85 mph = 136,794 km/h
- 86 mph = 138,404 km/h
- 87 mph = 140,013 km/h
- 88 mph = 141,622 km/h
- 89 mph = 143,232 km/h
- 90 mph = 144,841 km/h
- 91 mph = 146,45 km/h
- 92 mph = 148,06 km/h
- 93 mph = 149,669 km/h
- 94 mph = 151,278 km/h
- 95 mph = 152,888 km/h
- 96 mph = 154,497 km/h
- 97 mph = 156,106 km/h
- 98 mph = 157,716 km/h
- 99 mph = 159,325 km/h
- 100 mph = 160,934 km/h
- 101 mph = 162,544 km/h
- 102 mph = 164,153 km/h
- 103 mph = 165,762 km/h
- 104 mph = 167,372 km/h
- 105 mph = 168,981 km/h
- 106 mph = 170,59 km/h
- 107 mph = 172,2 km/h
- 108 mph = 173,809 km/h
- 109 mph = 175,418 km/h
- 110 mph = 177,028 km/h
- 111 mph = 178,637 km/h
- 112 mph = 180,247 km/h
- 113 mph = 181,856 km/h
- 114 mph = 183,465 km/h
- 115 mph = 185,075 km/h
- 116 mph = 186,684 km/h
- 117 mph = 188,293 km/h
- 118 mph = 189,903 km/h
- 119 mph = 191,512 km/h
- 120 mph = 193,121 km/h
- 121 mph = 194,731 km/h
- 122 mph = 196,34 km/h
- 123 mph = 197,949 km/h
- 124 mph = 199,559 km/h
- 125 mph = 201,168 km/h
- 126 mph = 202,777 km/h
- 127 mph = 204,387 km/h
- 128 mph = 205,996 km/h
- 129 mph = 207,605 km/h
- 130 mph = 209,215 km/h
- 131 mph = 210,824 km/h
- 132 mph = 212,433 km/h
- 133 mph = 214,043 km/h
- 134 mph = 215,652 km/h
- 135 mph = 217,261 km/h
- 136 mph = 218,871 km/h
- 137 mph = 220,48 km/h
- 138 mph = 222,089 km/h
- 139 mph = 223,699 km/h
- 140 mph = 225,308 km/h
- 141 mph = 226,918 km/h
- 142 mph = 228,527 km/h
- 143 mph = 230,136 km/h
- 144 mph = 231,746 km/h
- 145 mph = 233,355 km/h
- 146 mph = 234,964 km/h
- 147 mph = 236,574 km/h
- 148 mph = 238,183 km/h
- 149 mph = 239,792 km/h
- 150 mph = 241,402 km/h
- 151 mph = 243,011 km/h
- 152 mph = 244,62 km/h
- 153 mph = 246,23 km/h
- 154 mph = 247,839 km/h
- 155 mph = 249,448 km/h
- 156 mph = 251,058 km/h
- 157 mph = 252,667 km/h
- 158 mph = 254,276 km/h
- 159 mph = 255,886 km/h
- 160 mph = 257,495 km/h
- 161 mph = 259,104 km/h
- 162 mph = 260,714 km/h
- 163 mph = 262,323 km/h
- 164 mph = 263,932 km/h
- 165 mph = 265,542 km/h
- 166 mph = 267,151 km/h
- 167 mph = 268,76 km/h
- 168 mph = 270,37 km/h
- 169 mph = 271,979 km/h
- 170 mph = 273,588 km/h
- 171 mph = 275,198 km/h
- 172 mph = 276,807 km/h
- 173 mph = 278,417 km/h
- 174 mph = 280,026 km/h
- 175 mph = 281,635 km/h
- 176 mph = 283,245 km/h
- 177 mph = 284,854 km/h
- 178 mph = 286,463 km/h
- 179 mph = 288,073 km/h
- 180 mph = 289,682 km/h
- 181 mph = 291,291 km/h
- 182 mph = 292,901 km/h
- 183 mph = 294,51 km/h
- 184 mph = 296,119 km/h
- 185 mph = 297,729 km/h
- 186 mph = 299,338 km/h
- 187 mph = 300,947 km/h
- 188 mph = 302,557 km/h
- 189 mph = 304,166 km/h
- 190 mph = 305,775 km/h
- 191 mph = 307,385 km/h
- 192 mph = 308,994 km/h
- 193 mph = 310,603 km/h
- 194 mph = 312,213 km/h
- 195 mph = 313,822 km/h
- 196 mph = 315,431 km/h
- 197 mph = 317,041 km/h
- 198 mph = 318,65 km/h
- 199 mph = 320,259 km/h
- 200 mph = 321,869 km/h
- 205 mph = 329,916 km/h
- 210 mph = 337,962 km/h
- 215 mph = 346,009 km/h
- 220 mph = 354,056 km/h
- 225 mph = 362,102 km/h
- 230 mph = 370,149 km/h
- 235 mph = 378,196 km/h
- 240 mph = 386,243 km/h
- 245 mph = 394,289 km/h
- 250 mph = 402,336 km/h
- 255 mph = 410,383 km/h
- 260 mph = 418,429 km/h
- 265 mph = 426,476 km/h
- 270 mph = 434,523 km/h
- 275 mph = 442,57 km/h
- 280 mph = 450,616 km/h
- 285 mph = 458,663 km/h
- 290 mph = 466,71 km/h
- 295 mph = 474,756 km/h
- 300 mph = 482,803 km/h
- 305 mph = 490,85 km/h
- 310 mph = 498,897 km/h
- 315 mph = 506,943 km/h
- 320 mph = 514,99 km/h
- 325 mph = 523,037 km/h
- 330 mph = 531,084 km/h
- 335 mph = 539,13 km/h
- 340 mph = 547,177 km/h
- 345 mph = 555,224 km/h
- 350 mph = 563,27 km/h
- 355 mph = 571,317 km/h
- 360 mph = 579,364 km/h
- 365 mph = 587,411 km/h
- 370 mph = 595,457 km/h
- 375 mph = 603,504 km/h
- 380 mph = 611,551 km/h
- 385 mph = 619,597 km/h
- 390 mph = 627,644 km/h
- 395 mph = 635,691 km/h
- 400 mph = 643,738 km/h
- 405 mph = 651,784 km/h
- 410 mph = 659,831 km/h
- 415 mph = 667,878 km/h
- 420 mph = 675,924 km/h
- 425 mph = 683,971 km/h
- 430 mph = 692,018 km/h
- 435 mph = 700,065 km/h
- 440 mph = 708,111 km/h
- 445 mph = 716,158 km/h
- 450 mph = 724,205 km/h
- 455 mph = 732,252 km/h
- 460 mph = 740,298 km/h
- 465 mph = 748,345 km/h
- 470 mph = 756,392 km/h
- 475 mph = 764,438 km/h
- 480 mph = 772,485 km/h
- 485 mph = 780,532 km/h
- 490 mph = 788,579 km/h
- 495 mph = 796,625 km/h
- 500 mph = 804,672 km/h
- 510 mph = 820,765 km/h
- 520 mph = 836,859 km/h
- 530 mph = 852,952 km/h
- 540 mph = 869,046 km/h
- 550 mph = 885,139 km/h
- 560 mph = 901,233 km/h
- 570 mph = 917,326 km/h
- 580 mph = 933,42 km/h
- 590 mph = 949,513 km/h
- 600 mph = 965,606 km/h
- 610 mph = 981,7 km/h
- 620 mph = 997,793 km/h
- 630 mph = 1 013,887 km/h
- 640 mph = 1 029,98 km/h
- 650 mph = 1 046,074 km/h
- 660 mph = 1 062,167 km/h
- 670 mph = 1 078,26 km/h
- 680 mph = 1 094,354 km/h
- 690 mph = 1 110,447 km/h
- 700 mph = 1 126,541 km/h
- 710 mph = 1 142,634 km/h
- 720 mph = 1 158,728 km/h
- 730 mph = 1 174,821 km/h
- 740 mph = 1 190,915 km/h
- 750 mph = 1 207,008 km/h
- 760 mph = 1 223,101 km/h
- 770 mph = 1 239,195 km/h
- 780 mph = 1 255,288 km/h
- 790 mph = 1 271,382 km/h
- 800 mph = 1 287,475 km/h
- 810 mph = 1 303,569 km/h
- 820 mph = 1 319,662 km/h
- 830 mph = 1 335,756 km/h
- 840 mph = 1 351,849 km/h
- 850 mph = 1 367,942 km/h
- 860 mph = 1 384,036 km/h
- 870 mph = 1 400,129 km/h
- 880 mph = 1 416,223 km/h
- 890 mph = 1 432,316 km/h
- 900 mph = 1 448,41 km/h
- 910 mph = 1 464,503 km/h
- 920 mph = 1 480,596 km/h
- 930 mph = 1 496,69 km/h
- 940 mph = 1 512,783 km/h
- 950 mph = 1 528,877 km/h
- 960 mph = 1 544,97 km/h
- 970 mph = 1 561,064 km/h
- 980 mph = 1 577,157 km/h
- 990 mph = 1 593,251 km/h
- 1 000 mph = 1 609,344 km/h
- 1 025 mph = 1 649,578 km/h
- 1 050 mph = 1 689,811 km/h
- 1 075 mph = 1 730,045 km/h
- 1 100 mph = 1 770,278 km/h
- 1 125 mph = 1 810,512 km/h
- 1 150 mph = 1 850,746 km/h
- 1 175 mph = 1 890,979 km/h
- 1 200 mph = 1 931,213 km/h
- 1 225 mph = 1 971,446 km/h
- 1 250 mph = 2 011,68 km/h
- 1 275 mph = 2 051,914 km/h
- 1 300 mph = 2 092,147 km/h
- 1 325 mph = 2 132,381 km/h
- 1 350 mph = 2 172,614 km/h
- 1 375 mph = 2 212,848 km/h
- 1 400 mph = 2 253,082 km/h
- 1 425 mph = 2 293,315 km/h
- 1 450 mph = 2 333,549 km/h
- 1 475 mph = 2 373,782 km/h
- 1 500 mph = 2 414,016 km/h
- 1 525 mph = 2 454,25 km/h
- 1 550 mph = 2 494,483 km/h
- 1 575 mph = 2 534,717 km/h
- 1 600 mph = 2 574,95 km/h
- 1 625 mph = 2 615,184 km/h
- 1 650 mph = 2 655,418 km/h
- 1 675 mph = 2 695,651 km/h
- 1 700 mph = 2 735,885 km/h
- 1 725 mph = 2 776,118 km/h
- 1 750 mph = 2 816,352 km/h
- 1 775 mph = 2 856,586 km/h
- 1 800 mph = 2 896,819 km/h
- 1 825 mph = 2 937,053 km/h
- 1 850 mph = 2 977,286 km/h
- 1 875 mph = 3 017,52 km/h
- 1 900 mph = 3 057,754 km/h
- 1 925 mph = 3 097,987 km/h
- 1 950 mph = 3 138,221 km/h
- 1 975 mph = 3 178,454 km/h
- 2 000 mph = 3 218,688 km/h
- 2 050 mph = 3 299,155 km/h
- 2 100 mph = 3 379,622 km/h
- 2 150 mph = 3 460,09 km/h
- 2 200 mph = 3 540,557 km/h
- 2 250 mph = 3 621,024 km/h
- 2 300 mph = 3 701,491 km/h
- 2 350 mph = 3 781,958 km/h
- 2 400 mph = 3 862,426 km/h
- 2 450 mph = 3 942,893 km/h
- 2 500 mph = 4 023,36 km/h
- 2 550 mph = 4 103,827 km/h
- 2 600 mph = 4 184,294 km/h
- 2 650 mph = 4 264,762 km/h
- 2 700 mph = 4 345,229 km/h
- 2 750 mph = 4 425,696 km/h
- 2 800 mph = 4 506,163 km/h
- 2 850 mph = 4 586,63 km/h
- 2 900 mph = 4 667,098 km/h
- 2 950 mph = 4 747,565 km/h
- 3 000 mph = 4 828,032 km/h
- 3 050 mph = 4 908,499 km/h
- 3 100 mph = 4 988,966 km/h
- 3 150 mph = 5 069,434 km/h
- 3 200 mph = 5 149,901 km/h
- 3 250 mph = 5 230,368 km/h
- 3 300 mph = 5 310,835 km/h
- 3 350 mph = 5 391,302 km/h
- 3 400 mph = 5 471,77 km/h
- 3 450 mph = 5 552,237 km/h
- 3 500 mph = 5 632,704 km/h
- 3 550 mph = 5 713,171 km/h
- 3 600 mph = 5 793,638 km/h
- 3 650 mph = 5 874,106 km/h
- 3 700 mph = 5 954,573 km/h
- 3 750 mph = 6 035,04 km/h
- 3 800 mph = 6 115,507 km/h
- 3 850 mph = 6 195,974 km/h
- 3 900 mph = 6 276,442 km/h
- 3 950 mph = 6 356,909 km/h
- 4 000 mph = 6 437,376 km/h
- 4 050 mph = 6 517,843 km/h
- 4 100 mph = 6 598,31 km/h
- 4 150 mph = 6 678,778 km/h
- 4 200 mph = 6 759,245 km/h
- 4 250 mph = 6 839,712 km/h
- 4 300 mph = 6 920,179 km/h
- 4 350 mph = 7 000,646 km/h
- 4 400 mph = 7 081,114 km/h
- 4 450 mph = 7 161,581 km/h
- 4 500 mph = 7 242,048 km/h
- 4 550 mph = 7 322,515 km/h
- 4 600 mph = 7 402,982 km/h
- 4 650 mph = 7 483,45 km/h
- 4 700 mph = 7 563,917 km/h
- 4 750 mph = 7 644,384 km/h
- 4 800 mph = 7 724,851 km/h
- 4 850 mph = 7 805,318 km/h
- 4 900 mph = 7 885,786 km/h
- 4 950 mph = 7 966,253 km/h
- 5 000 mph = 8 046,72 km/h
- 5 100 mph = 8 207,654 km/h
- 5 200 mph = 8 368,589 km/h
- 5 300 mph = 8 529,523 km/h
- 5 400 mph = 8 690,458 km/h
- 5 500 mph = 8 851,392 km/h
- 5 600 mph = 9 012,326 km/h
- 5 700 mph = 9 173,261 km/h
- 5 800 mph = 9 334,195 km/h
- 5 900 mph = 9 495,13 km/h
- 6 000 mph = 9 656,064 km/h
- 6 100 mph = 9 816,998 km/h
- 6 200 mph = 9 977,933 km/h
- 6 300 mph = 10 138,867 km/h
- 6 400 mph = 10 299,802 km/h
- 6 500 mph = 10 460,736 km/h
- 6 600 mph = 10 621,67 km/h
- 6 700 mph = 10 782,605 km/h
- 6 800 mph = 10 943,539 km/h
- 6 900 mph = 11 104,474 km/h
- 7 000 mph = 11 265,408 km/h
- 7 100 mph = 11 426,342 km/h
- 7 200 mph = 11 587,277 km/h
- 7 300 mph = 11 748,211 km/h
- 7 400 mph = 11 909,146 km/h
- 7 500 mph = 12 070,08 km/h
- 7 600 mph = 12 231,014 km/h
- 7 700 mph = 12 391,949 km/h
- 7 800 mph = 12 552,883 km/h
- 7 900 mph = 12 713,818 km/h
- 8 000 mph = 12 874,752 km/h
- 8 100 mph = 13 035,686 km/h
- 8 200 mph = 13 196,621 km/h
- 8 300 mph = 13 357,555 km/h
- 8 400 mph = 13 518,49 km/h
- 8 500 mph = 13 679,424 km/h
- 8 600 mph = 13 840,358 km/h
- 8 700 mph = 14 001,293 km/h
- 8 800 mph = 14 162,227 km/h
- 8 900 mph = 14 323,162 km/h
- 9 000 mph = 14 484,096 km/h
- 9 100 mph = 14 645,03 km/h
- 9 200 mph = 14 805,965 km/h
- 9 300 mph = 14 966,899 km/h
- 9 400 mph = 15 127,834 km/h
- 9 500 mph = 15 288,768 km/h
- 9 600 mph = 15 449,702 km/h
- 9 700 mph = 15 610,637 km/h
- 9 800 mph = 15 771,571 km/h
- 9 900 mph = 15 932,506 km/h
- 10 000 mph = 16 093,44 km/h
Facteur identique à celui des distances : 1 mile = 1,609344 km exactement, donc 1 mph = 1,609344 km/h. Méthodologie & sources.
Questions fréquentes
Combien font 70 mph en km/h ?
70 mph égalent 112,7 km/h. C'est la limite maximale sur les autoroutes britanniques, sensiblement plus basse que les 130 km/h français.
Mon compteur affiche les deux unités, laquelle fait foi ?
Celle du pays où vous roulez : les panneaux britanniques et américains sont en mph, ceux du reste de l'Europe en km/h. Les compteurs européens affichent généralement les deux graduations, mph en petit sur le cadran.
Les nœuds des bateaux et des avions, c'est encore autre chose ?
Oui : 1 nœud = 1 mile marin par heure = 1,852 km/h. Un avion à 500 nœuds vole donc à 926 km/h, pas à 805. Le mile marin diffère du mile terrestre utilisé pour les mph routiers.
Existe-t-il une limitation unique aux États-Unis ?
Non, chaque État fixe la sienne. Le Texas autorise 85 mph sur un tronçon de la State Highway 130, soit 136,8 km/h, le maximum affiché du pays, quand Hawaï plafonne à 60 mph, soit 96,6 km/h. La plupart des autoroutes inter-États se tiennent entre 65 et 80 mph, donc entre 105 et 129 km/h.
Pourquoi voit-on encore des panneaux à 55 mph ?
Parce qu'une limite fédérale de 55 mph, soit 88,5 km/h, a été imposée à tout le pays en 1974 pour économiser le carburant après le choc pétrolier. Assouplie en 1987, elle n'a été abrogée qu'en 1995. Les États ont ensuite relevé leurs limites chacun à leur rythme, et certains tronçons urbains sont restés à 55.