| kilometers per hour | 1 km/h | 2 km/h | 3 km/h | 4 km/h | 5 km/h | 6 km/h | 7 km/h | 8 km/h | 9 km/h | 10 km/h | 11 km/h | 12 km/h | 13 km/h | 14 km/h | 15 km/h | 16 km/h | 17 km/h | 18 km/h | 19 km/h | 20 km/h | 21 km/h | 22 km/h | 23 km/h | 24 km/h | 25 km/h | 26 km/h | 27 km/h | 28 km/h | 29 km/h | 30 km/h | 31 km/h | 32 km/h | 33 km/h | 34 km/h | 35 km/h | 36 km/h | 37 km/h | 38 km/h | 39 km/h | 40 km/h | 41 km/h | 42 km/h | 43 km/h | 44 km/h | 45 km/h | 46 km/h | 47 km/h | 48 km/h | 49 km/h | 50 km/h | 51 km/h | 52 km/h | 53 km/h | 54 km/h | 55 km/h | 56 km/h | 57 km/h | 58 km/h | 59 km/h | 60 km/h | 61 km/h | 62 km/h | 63 km/h | 64 km/h | 65 km/h | 66 km/h | 67 km/h | 68 km/h | 69 km/h | 70 km/h | 71 km/h | 72 km/h | 73 km/h | 74 km/h | 75 km/h | 76 km/h | 77 km/h | 78 km/h | 79 km/h | 80 km/h | 81 km/h | 82 km/h | 83 km/h | 84 km/h | 85 km/h | 86 km/h | 87 km/h | 88 km/h | 89 km/h | 90 km/h | 91 km/h | 92 km/h | 93 km/h | 94 km/h | 95 km/h | 96 km/h | 97 km/h | 98 km/h | 99 km/h | 100 km/h |
| speed of sound (32 °F) | 0.0008387 s | 0.0016774 s | 0.0025161 s | 0.0033548 s | 0.0041935 s | 0.0050322 s | 0.0058709 s | 0.0067096 s | 0.0075483 s | 0.0083870 s | 0.0092257 s | 0.0100644 s | 0.0109031 s | 0.0117418 s | 0.0125805 s | 0.0134192 s | 0.0142579 s | 0.0150966 s | 0.0159353 s | 0.0167740 s | 0.0176127 s | 0.0184514 s | 0.0192901 s | 0.0201288 s | 0.0209675 s | 0.0218062 s | 0.0226449 s | 0.0234836 s | 0.0243223 s | 0.0251610 s | 0.0259997 s | 0.0268384 s | 0.0276771 s | 0.0285158 s | 0.0293545 s | 0.0301932 s | 0.0310319 s | 0.0318706 s | 0.0327093 s | 0.0335480 s | 0.0343867 s | 0.0352254 s | 0.0360641 s | 0.0369028 s | 0.0377415 s | 0.0385802 s | 0.0394189 s | 0.0402576 s | 0.0410963 s | 0.0419351 s | 0.0427738 s | 0.0436125 s | 0.0444512 s | 0.0452899 s | 0.0461286 s | 0.0469673 s | 0.0478060 s | 0.0486447 s | 0.0494834 s | 0.0503221 s | 0.0511608 s | 0.0519995 s | 0.0528382 s | 0.0536769 s | 0.0545156 s | 0.0553543 s | 0.0561930 s | 0.0570317 s | 0.0578704 s | 0.0587091 s | 0.0595478 s | 0.0603865 s | 0.0612252 s | 0.0620639 s | 0.0629026 s | 0.0637413 s | 0.0645800 s | 0.0654187 s | 0.0662574 s | 0.0670961 s | 0.0679348 s | 0.0687735 s | 0.0696122 s | 0.0704509 s | 0.0712896 s | 0.0721283 s | 0.0729670 s | 0.0738057 s | 0.0746444 s | 0.0754831 s | 0.0763218 s | 0.0771605 s | 0.0779992 s | 0.0788379 s | 0.0796766 s | 0.0805153 s | 0.0813540 s | 0.0821927 s | 0.0830314 s | 0.0838701 s |
The kilometre per hour (American English: kilometer per hour) is a unit of speed, expressing the number of kilometres travelled in one hour.
| 1 kilometers per hour ≈ 0.00083870101986044 speed of sounds (32 °F) | 6 kilometers per hour ≈ 0.0050322061191626 speed of sounds (32 °F) |
| 2 kilometers per hour ≈ 0.0016774020397209 speed of sounds (32 °F) | 7 kilometers per hour ≈ 0.0058709071390231 speed of sounds (32 °F) |
| 3 kilometers per hour ≈ 0.0025161030595813 speed of sounds (32 °F) | 8 kilometers per hour ≈ 0.0067096081588835 speed of sounds (32 °F) |
| 4 kilometers per hour ≈ 0.0033548040794418 speed of sounds (32 °F) | 9 kilometers per hour ≈ 0.007548309178744 speed of sounds (32 °F) |
| 5 kilometers per hour ≈ 0.0041935050993022 speed of sounds (32 °F) | 10 kilometers per hour ≈ 0.0083870101986044 speed of sounds (32 °F) |
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) ≈ 1192.32 kilometers per hour | 6 speed of sounds (32 °F) ≈ 7153.92 kilometers per hour |
| 2 speed of sounds (32 °F) ≈ 2384.64 kilometers per hour | 7 speed of sounds (32 °F) ≈ 8346.24 kilometers per hour |
| 3 speed of sounds (32 °F) ≈ 3576.96 kilometers per hour | 8 speed of sounds (32 °F) ≈ 9538.56 kilometers per hour |
| 4 speed of sounds (32 °F) ≈ 4769.28 kilometers per hour | 9 speed of sounds (32 °F) ≈ 10730.88 kilometers per hour |
| 5 speed of sounds (32 °F) ≈ 5961.6 kilometers per hour | 10 speed of sounds (32 °F) ≈ 11923.2 kilometers per hour |
| 1 kilometers per hour ≈ 0.0008387 speed of sounds (32 °F) |
| 1 speed of sounds (32 °F) ≈ 1,192.32 kilometers per hour |