| fortnight | 1 fn | 2 fn | 3 fn | 4 fn | 5 fn | 6 fn | 7 fn | 8 fn | 9 fn | 10 fn | 11 fn | 12 fn | 13 fn | 14 fn | 15 fn | 16 fn | 17 fn | 18 fn | 19 fn | 20 fn | 21 fn | 22 fn | 23 fn | 24 fn | 25 fn | 26 fn | 27 fn | 28 fn | 29 fn | 30 fn | 31 fn | 32 fn | 33 fn | 34 fn | 35 fn | 36 fn | 37 fn | 38 fn | 39 fn | 40 fn | 41 fn | 42 fn | 43 fn | 44 fn | 45 fn | 46 fn | 47 fn | 48 fn | 49 fn | 50 fn | 51 fn | 52 fn | 53 fn | 54 fn | 55 fn | 56 fn | 57 fn | 58 fn | 59 fn | 60 fn | 61 fn | 62 fn | 63 fn | 64 fn | 65 fn | 66 fn | 67 fn | 68 fn | 69 fn | 70 fn | 71 fn | 72 fn | 73 fn | 74 fn | 75 fn | 76 fn | 77 fn | 78 fn | 79 fn | 80 fn | 81 fn | 82 fn | 83 fn | 84 fn | 85 fn | 86 fn | 87 fn | 88 fn | 89 fn | 90 fn | 91 fn | 92 fn | 93 fn | 94 fn | 95 fn | 96 fn | 97 fn | 98 fn | 99 fn | 100 fn |
| second | 1 209 600 s | 2 419 200 s | 3 628 800 s | 4 838 400 s | 6 048 000 s | 7 257 600 s | 8 467 200 s | 9 676 800 s | 10 886 400 s | 12 096 000 s | 13 305 600 s | 14 515 200 s | 15 724 800 s | 16 934 400 s | 18 144 000 s | 19 353 600 s | 20 563 200 s | 21 772 800 s | 22 982 400 s | 24 192 000 s | 25 401 600 s | 26 611 200 s | 27 820 800 s | 29 030 400 s | 30 240 000 s | 31 449 600 s | 32 659 200 s | 33 868 800 s | 35 078 400 s | 36 288 000 s | 37 497 600 s | 38 707 200 s | 39 916 800 s | 41 126 400 s | 42 336 000 s | 43 545 600 s | 44 755 200 s | 45 964 800 s | 47 174 400 s | 48 384 000 s | 49 593 600 s | 50 803 200 s | 52 012 800 s | 53 222 400 s | 54 432 000 s | 55 641 600 s | 56 851 200 s | 58 060 800 s | 59 270 400 s | 60 480 000 s | 61 689 600 s | 62 899 200 s | 64 108 800 s | 65 318 400 s | 66 528 000 s | 67 737 600 s | 68 947 200 s | 70 156 800 s | 71 366 400 s | 72 576 000 s | 73 785 600 s | 74 995 200 s | 76 204 800 s | 77 414 400 s | 78 624 000 s | 79 833 600 s | 81 043 200 s | 82 252 800 s | 83 462 400 s | 84 672 000 s | 85 881 600 s | 87 091 200 s | 88 300 800 s | 89 510 400 s | 90 720 000 s | 91 929 600 s | 93 139 200 s | 94 348 800 s | 95 558 400 s | 96 768 000 s | 97 977 600 s | 99 187 200 s | 100 396 800 s | 101 606 400 s | 102 816 000 s | 104 025 600 s | 105 235 200 s | 106 444 800 s | 107 654 400 s | 108 864 000 s | 110 073 600 s | 111 283 200 s | 112 492 800 s | 113 702 400 s | 114 912 000 s | 116 121 600 s | 117 331 200 s | 118 540 800 s | 119 750 400 s | 120 960 000 s |
A fortnight is a unit of time equal to 14 days (2 weeks). The word derives from the Old English: fēowertyne niht, meaning "fourteen nights".
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| fortnight | fn | ≡ 2 wk | = 1.2096 Ms | Metric system SI |
| fortnights | seconds | fortnights | seconds |
|---|---|---|---|
| 1 | = 1209600 | 6 | = 7257600 |
| 2 | = 2419200 | 7 | = 8467200 |
| 3 | = 3628800 | 8 | = 9676800 |
| 4 | = 4838400 | 9 | = 10886400 |
| 5 | = 6048000 | 10 | = 12096000 |
The second (symbol: s) (abbreviated s or sec) is the base unit of time in the International System of Units / Système International d'Unités (SI).
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| second | s | time of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom at 0 K(but other seconds are sometimes used in astronomy). Also that time it takes for light to travel a distance of 299792458 metres. | ≡ 1 second | Metric system SI |
| seconds | fortnights | seconds | fortnights |
|---|---|---|---|
| 1 | = 8.2671957671958E-7 | 6 | = 4.9603174603175E-6 |
| 2 | = 1.6534391534392E-6 | 7 | = 5.787037037037E-6 |
| 3 | = 2.4801587301587E-6 | 8 | = 6.6137566137566E-6 |
| 4 | = 3.3068783068783E-6 | 9 | = 7.4404761904762E-6 |
| 5 | = 4.1335978835979E-6 | 10 | = 8.2671957671958E-6 |
| fortnights | seconds |
|---|---|
| 1 | = 1 209 600 |
| 8.2671957671958 × 10-7 | = 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |