| 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 |
| yard per hour | 1,350,393.7007874 ydph | 2,700,787.4015748 ydph | 4,051,181.1023622 ydph | 5,401,574.8031496 ydph | 6,751,968.503937 ydph | 8,102,362.2047244 ydph | 9,452,755.9055118 ydph | 10,803,149.606299 ydph | 12,153,543.307087 ydph | 13,503,937.007874 ydph | 14,854,330.708661 ydph | 16,204,724.409449 ydph | 17,555,118.110236 ydph | 18,905,511.811024 ydph | 20,255,905.511811 ydph | 21,606,299.212598 ydph | 22,956,692.913386 ydph | 24,307,086.614173 ydph | 25,657,480.314961 ydph | 27,007,874.015748 ydph | 28,358,267.716535 ydph | 29,708,661.417323 ydph | 31,059,055.11811 ydph | 32,409,448.818898 ydph | 33,759,842.519685 ydph | 35,110,236.220472 ydph | 36,460,629.92126 ydph | 37,811,023.622047 ydph | 39,161,417.322835 ydph | 40,511,811.023622 ydph | 41,862,204.724409 ydph | 43,212,598.425197 ydph | 44,562,992.125984 ydph | 45,913,385.826772 ydph | 47,263,779.527559 ydph | 48,614,173.228346 ydph | 49,964,566.929134 ydph | 51,314,960.629921 ydph | 52,665,354.330709 ydph | 54,015,748.031496 ydph | 55,366,141.732283 ydph | 56,716,535.433071 ydph | 58,066,929.133858 ydph | 59,417,322.834646 ydph | 60,767,716.535433 ydph | 62,118,110.23622 ydph | 63,468,503.937008 ydph | 64,818,897.637795 ydph | 66,169,291.338583 ydph | 67,519,685.03937 ydph | 68,870,078.740157 ydph | 70,220,472.440945 ydph | 71,570,866.141732 ydph | 72,921,259.84252 ydph | 74,271,653.543307 ydph | 75,622,047.244094 ydph | 76,972,440.944882 ydph | 78,322,834.645669 ydph | 79,673,228.346457 ydph | 81,023,622.047244 ydph | 82,374,015.748031 ydph | 83,724,409.448819 ydph | 85,074,803.149606 ydph | 86,425,196.850394 ydph | 87,775,590.551181 ydph | 89,125,984.251969 ydph | 90,476,377.952756 ydph | 91,826,771.653543 ydph | 93,177,165.354331 ydph | 94,527,559.055118 ydph | 95,877,952.755906 ydph | 97,228,346.456693 ydph | 98,578,740.15748 ydph | 99,929,133.858268 ydph | 101,279,527.55906 ydph | 102,629,921.25984 ydph | 103,980,314.96063 ydph | 105,330,708.66142 ydph | 106,681,102.3622 ydph | 108,031,496.06299 ydph | 109,381,889.76378 ydph | 110,732,283.46457 ydph | 112,082,677.16535 ydph | 113,433,070.86614 ydph | 114,783,464.56693 ydph | 116,133,858.26772 ydph | 117,484,251.9685 ydph | 118,834,645.66929 ydph | 120,185,039.37008 ydph | 121,535,433.07087 ydph | 122,885,826.77165 ydph | 124,236,220.47244 ydph | 125,586,614.17323 ydph | 126,937,007.87402 ydph | 128,287,401.5748 ydph | 129,637,795.27559 ydph | 130,988,188.97638 ydph | 132,338,582.67717 ydph | 133,688,976.37795 ydph | 135,039,370.07874 ydph |
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) ≈ 1350393.7007874 yards per hour | 6 speed of sounds (68 °F) ≈ 8102362.2047244 yards per hour |
| 2 speed of sounds (68 °F) ≈ 2700787.4015748 yards per hour | 7 speed of sounds (68 °F) ≈ 9452755.9055118 yards per hour |
| 3 speed of sounds (68 °F) ≈ 4051181.1023622 yards per hour | 8 speed of sounds (68 °F) ≈ 10803149.606299 yards per hour |
| 4 speed of sounds (68 °F) ≈ 5401574.8031496 yards per hour | 9 speed of sounds (68 °F) ≈ 12153543.307087 yards per hour |
| 5 speed of sounds (68 °F) ≈ 6751968.503937 yards per hour | 10 speed of sounds (68 °F) ≈ 13503937.007874 yards per hour |
Yards per hour (abbreviated mph, YDPH or yd/h) is an imperial and United States customary unit of speed expressing the number of statute yards covered in one hour.
| 1 yards per hour ≈ 7.4052478134111E-7 speed of sounds (68 °F) | 6 yards per hour ≈ 4.4431486880466E-6 speed of sounds (68 °F) |
| 2 yards per hour ≈ 1.4810495626822E-6 speed of sounds (68 °F) | 7 yards per hour ≈ 5.1836734693878E-6 speed of sounds (68 °F) |
| 3 yards per hour ≈ 2.2215743440233E-6 speed of sounds (68 °F) | 8 yards per hour ≈ 5.9241982507289E-6 speed of sounds (68 °F) |
| 4 yards per hour ≈ 2.9620991253644E-6 speed of sounds (68 °F) | 9 yards per hour ≈ 6.66472303207E-6 speed of sounds (68 °F) |
| 5 yards per hour ≈ 3.7026239067055E-6 speed of sounds (68 °F) | 10 yards per hour ≈ 7.4052478134111E-6 speed of sounds (68 °F) |
| 1 speed of sounds (68 °F) ≈ 1,350,393.7007874 yards per hour |
| 1 yards per hour ≈ 7.4052478134111 × 10-7 speed of sounds (68 °F) |