| speed of sound (68 °F) | 1 s | 2 s | 3 s | 4 s | 5 s | 6 s | 7 s | 8 s | 9 s | 10 s | 11 s | 12 s | 13 s | 14 s | 15 s | 16 s | 17 s | 18 s | 19 s | 20 s | 21 s | 22 s | 23 s | 24 s | 25 s | 26 s | 27 s | 28 s | 29 s | 30 s | 31 s | 32 s | 33 s | 34 s | 35 s | 36 s | 37 s | 38 s | 39 s | 40 s | 41 s | 42 s | 43 s | 44 s | 45 s | 46 s | 47 s | 48 s | 49 s | 50 s | 51 s | 52 s | 53 s | 54 s | 55 s | 56 s | 57 s | 58 s | 59 s | 60 s | 61 s | 62 s | 63 s | 64 s | 65 s | 66 s | 67 s | 68 s | 69 s | 70 s | 71 s | 72 s | 73 s | 74 s | 75 s | 76 s | 77 s | 78 s | 79 s | 80 s | 81 s | 82 s | 83 s | 84 s | 85 s | 86 s | 87 s | 88 s | 89 s | 90 s | 91 s | 92 s | 93 s | 94 s | 95 s | 96 s | 97 s | 98 s | 99 s | 100 s |
| mile per hour | 767.2691482 mph | 1,534.5382963 mph | 2,301.8074445 mph | 3,069.0765927 mph | 3,836.3457409 mph | 4,603.6148890 mph | 5,370.8840372 mph | 6,138.1531854 mph | 6,905.4223336 mph | 7,672.6914817 mph | 8,439.9606299 mph | 9,207.2297781 mph | 9,974.4989263 mph | 10,741.7680744 mph | 11,509.0372226 mph | 12,276.3063708 mph | 13,043.5755190 mph | 13,810.8446671 mph | 14,578.1138153 mph | 15,345.3829635 mph | 16,112.6521117 mph | 16,879.9212598 mph | 17,647.1904080 mph | 18,414.4595562 mph | 19,181.7287044 mph | 19,948.9978525 mph | 20,716.2670007 mph | 21,483.5361489 mph | 22,250.8052971 mph | 23,018.0744452 mph | 23,785.3435934 mph | 24,552.6127416 mph | 25,319.8818898 mph | 26,087.1510379 mph | 26,854.4201861 mph | 27,621.6893343 mph | 28,388.9584825 mph | 29,156.2276306 mph | 29,923.4967788 mph | 30,690.7659270 mph | 31,458.0350752 mph | 32,225.3042233 mph | 32,992.5733715 mph | 33,759.8425197 mph | 34,527.1116679 mph | 35,294.3808160 mph | 36,061.6499642 mph | 36,828.9191124 mph | 37,596.1882606 mph | 38,363.4574087 mph | 39,130.7265569 mph | 39,897.9957051 mph | 40,665.2648533 mph | 41,432.5340014 mph | 42,199.8031496 mph | 42,967.0722978 mph | 43,734.3414460 mph | 44,501.6105941 mph | 45,268.8797423 mph | 46,036.1488905 mph | 46,803.4180387 mph | 47,570.6871868 mph | 48,337.9563350 mph | 49,105.2254832 mph | 49,872.4946314 mph | 50,639.7637795 mph | 51,407.0329277 mph | 52,174.3020759 mph | 52,941.5712241 mph | 53,708.8403722 mph | 54,476.1095204 mph | 55,243.3786686 mph | 56,010.6478168 mph | 56,777.9169649 mph | 57,545.1861131 mph | 58,312.4552613 mph | 59,079.7244094 mph | 59,846.9935576 mph | 60,614.2627058 mph | 61,381.5318540 mph | 62,148.8010021 mph | 62,916.0701503 mph | 63,683.3392985 mph | 64,450.6084467 mph | 65,217.8775948 mph | 65,985.1467430 mph | 66,752.4158912 mph | 67,519.6850394 mph | 68,286.9541875 mph | 69,054.2233357 mph | 69,821.4924839 mph | 70,588.7616321 mph | 71,356.0307802 mph | 72,123.2999284 mph | 72,890.5690766 mph | 73,657.8382248 mph | 74,425.1073729 mph | 75,192.3765211 mph | 75,959.6456693 mph | 76,726.9148175 mph |
The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. In dry air at 0 °C (32 °F), the speed of sound is 331.2 metres per second (1,087 ft/s; 1,192 km/h; 741 mph; 644 kn). At 20 °C (68 °F), the speed of sound is 343 metres per second (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or a kilometre in 2.91 s or a mile in 4.69 s.
| 1 speed of sounds (68 °F) ≈ 767.26914817466 miles per hour | 6 speed of sounds (68 °F) ≈ 4603.614889048 miles per hour |
| 2 speed of sounds (68 °F) ≈ 1534.5382963493 miles per hour | 7 speed of sounds (68 °F) ≈ 5370.8840372226 miles per hour |
| 3 speed of sounds (68 °F) ≈ 2301.807444524 miles per hour | 8 speed of sounds (68 °F) ≈ 6138.1531853973 miles per hour |
| 4 speed of sounds (68 °F) ≈ 3069.0765926986 miles per hour | 9 speed of sounds (68 °F) ≈ 6905.4223335719 miles per hour |
| 5 speed of sounds (68 °F) ≈ 3836.3457408733 miles per hour | 10 speed of sounds (68 °F) ≈ 7672.6914817466 miles per hour |
Miles per hour (abbreviated mph, MPH or mi/h) is an imperial and United States customary unit of speed expressing the number of statute miles covered in one hour. Although kilometres per hour is now the most widely used measure of speed, miles per hour remains the standard unit for speed limits in the United States, the United Kingdom, Antigua & Barbuda and Puerto Rico, although the latter two use kilometres for long distances.
| 1 miles per hour ≈ 0.0013033236151603 speed of sounds (68 °F) | 6 miles per hour ≈ 0.0078199416909621 speed of sounds (68 °F) |
| 2 miles per hour ≈ 0.0026066472303207 speed of sounds (68 °F) | 7 miles per hour ≈ 0.0091232653061224 speed of sounds (68 °F) |
| 3 miles per hour ≈ 0.0039099708454811 speed of sounds (68 °F) | 8 miles per hour ≈ 0.010426588921283 speed of sounds (68 °F) |
| 4 miles per hour ≈ 0.0052132944606414 speed of sounds (68 °F) | 9 miles per hour ≈ 0.011729912536443 speed of sounds (68 °F) |
| 5 miles per hour ≈ 0.0065166180758017 speed of sounds (68 °F) | 10 miles per hour ≈ 0.013033236151603 speed of sounds (68 °F) |
| 1 speed of sounds (68 °F) ≈ 767.2691482 miles per hour |
| 1 miles per hour ≈ 0.0013033 speed of sounds (68 °F) |