| speed of sound (32 °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 | 740.8732999 mph | 1,481.7465999 mph | 2,222.6198998 mph | 2,963.4931997 mph | 3,704.3664996 mph | 4,445.2397996 mph | 5,186.1130995 mph | 5,926.9863994 mph | 6,667.8596994 mph | 7,408.7329993 mph | 8,149.6062992 mph | 8,890.4795991 mph | 9,631.3528991 mph | 10,372.2261990 mph | 11,113.0994989 mph | 11,853.9727989 mph | 12,594.8460988 mph | 13,335.7193987 mph | 14,076.5926986 mph | 14,817.4659986 mph | 15,558.3392985 mph | 16,299.2125984 mph | 17,040.0858984 mph | 17,780.9591983 mph | 18,521.8324982 mph | 19,262.7057981 mph | 20,003.5790981 mph | 20,744.4523980 mph | 21,485.3256979 mph | 22,226.1989979 mph | 22,967.0722978 mph | 23,707.9455977 mph | 24,448.8188976 mph | 25,189.6921976 mph | 25,930.5654975 mph | 26,671.4387974 mph | 27,412.3120974 mph | 28,153.1853973 mph | 28,894.0586972 mph | 29,634.9319971 mph | 30,375.8052971 mph | 31,116.6785970 mph | 31,857.5518969 mph | 32,598.4251969 mph | 33,339.2984968 mph | 34,080.1717967 mph | 34,821.0450966 mph | 35,561.9183966 mph | 36,302.7916965 mph | 37,043.6649964 mph | 37,784.5382963 mph | 38,525.4115963 mph | 39,266.2848962 mph | 40,007.1581961 mph | 40,748.0314961 mph | 41,488.9047960 mph | 42,229.7780959 mph | 42,970.6513958 mph | 43,711.5246958 mph | 44,452.3979957 mph | 45,193.2712956 mph | 45,934.1445956 mph | 46,675.0178955 mph | 47,415.8911954 mph | 48,156.7644953 mph | 48,897.6377953 mph | 49,638.5110952 mph | 50,379.3843951 mph | 51,120.2576951 mph | 51,861.1309950 mph | 52,602.0042949 mph | 53,342.8775948 mph | 54,083.7508948 mph | 54,824.6241947 mph | 55,565.4974946 mph | 56,306.3707946 mph | 57,047.2440945 mph | 57,788.1173944 mph | 58,528.9906943 mph | 59,269.8639943 mph | 60,010.7372942 mph | 60,751.6105941 mph | 61,492.4838941 mph | 62,233.3571940 mph | 62,974.2304939 mph | 63,715.1037938 mph | 64,455.9770938 mph | 65,196.8503937 mph | 65,937.7236936 mph | 66,678.5969936 mph | 67,419.4702935 mph | 68,160.3435934 mph | 68,901.2168933 mph | 69,642.0901933 mph | 70,382.9634932 mph | 71,123.8367931 mph | 71,864.7100931 mph | 72,605.5833930 mph | 73,346.4566929 mph | 74,087.3299928 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 (32 °F) ≈ 740.87329992842 miles per hour | 6 speed of sounds (32 °F) ≈ 4445.2397995705 miles per hour |
| 2 speed of sounds (32 °F) ≈ 1481.7465998568 miles per hour | 7 speed of sounds (32 °F) ≈ 5186.1130994989 miles per hour |
| 3 speed of sounds (32 °F) ≈ 2222.6198997853 miles per hour | 8 speed of sounds (32 °F) ≈ 5926.9863994273 miles per hour |
| 4 speed of sounds (32 °F) ≈ 2963.4931997137 miles per hour | 9 speed of sounds (32 °F) ≈ 6667.8596993558 miles per hour |
| 5 speed of sounds (32 °F) ≈ 3704.3664996421 miles per hour | 10 speed of sounds (32 °F) ≈ 7408.7329992842 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 ≈ 0.0013497584541063 speed of sounds (32 °F) | 6 miles per hour ≈ 0.0080985507246377 speed of sounds (32 °F) |
| 2 miles per hour ≈ 0.0026995169082126 speed of sounds (32 °F) | 7 miles per hour ≈ 0.009448309178744 speed of sounds (32 °F) |
| 3 miles per hour ≈ 0.0040492753623188 speed of sounds (32 °F) | 8 miles per hour ≈ 0.01079806763285 speed of sounds (32 °F) |
| 4 miles per hour ≈ 0.0053990338164251 speed of sounds (32 °F) | 9 miles per hour ≈ 0.012147826086957 speed of sounds (32 °F) |
| 5 miles per hour ≈ 0.0067487922705314 speed of sounds (32 °F) | 10 miles per hour ≈ 0.013497584541063 speed of sounds (32 °F) |
| 1 speed of sounds (32 °F) ≈ 740.8732999 miles per hour |
| 1 miles per hour ≈ 0.0013498 speed of sounds (32 °F) |