| 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 |
| week | 2 wk | 4 wk | 6 wk | 8 wk | 10 wk | 12 wk | 14 wk | 16 wk | 18 wk | 20 wk | 22 wk | 24 wk | 26 wk | 28 wk | 30 wk | 32 wk | 34 wk | 36 wk | 38 wk | 40 wk | 42 wk | 44 wk | 46 wk | 48 wk | 50 wk | 52 wk | 54 wk | 56 wk | 58 wk | 60 wk | 62 wk | 64 wk | 66 wk | 68 wk | 70 wk | 72 wk | 74 wk | 76 wk | 78 wk | 80 wk | 82 wk | 84 wk | 86 wk | 88 wk | 90 wk | 92 wk | 94 wk | 96 wk | 98 wk | 100 wk | 102 wk | 104 wk | 106 wk | 108 wk | 110 wk | 112 wk | 114 wk | 116 wk | 118 wk | 120 wk | 122 wk | 124 wk | 126 wk | 128 wk | 130 wk | 132 wk | 134 wk | 136 wk | 138 wk | 140 wk | 142 wk | 144 wk | 146 wk | 148 wk | 150 wk | 152 wk | 154 wk | 156 wk | 158 wk | 160 wk | 162 wk | 164 wk | 166 wk | 168 wk | 170 wk | 172 wk | 174 wk | 176 wk | 178 wk | 180 wk | 182 wk | 184 wk | 186 wk | 188 wk | 190 wk | 192 wk | 194 wk | 196 wk | 198 wk | 200 wk |
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 | weeks | fortnights | weeks |
|---|---|---|---|
| 1 | = 2 | 6 | = 12 |
| 2 | = 4 | 7 | = 14 |
| 3 | = 6 | 8 | = 16 |
| 4 | = 8 | 9 | = 18 |
| 5 | = 10 | 10 | = 20 |
A week is a time unit equal to seven days.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| week | wk | ≡ 7 d = 168 h = 10 080 min = 604 800 s | = 604 800 s | Metric system SI |
| weeks | fortnights | weeks | fortnights |
|---|---|---|---|
| 1 | = 0.5 | 6 | = 3 |
| 2 | = 1 | 7 | = 3.5 |
| 3 | = 1.5 | 8 | = 4 |
| 4 | = 2 | 9 | = 4.5 |
| 5 | = 2.5 | 10 | = 5 |
| fortnights | weeks |
|---|---|
| 1 | = 2 |
| 0.5 | = 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 …) |