How to Convert Weeks to Fortnights (wk to fn)
Time conversions help with project planning, payroll hours and working out how long a loan or COE period really is. This guide shows how to convert weeks into fortnights by hand, with examples and a quick-reference table.
The conversion
To convert weeks to fortnights, multiply the value by 0.5. To go the other way, divide by the same number (or multiply by 2). For a quick estimate, multiply by about 0.5.
Fortnights = weeks × 0.5
Worked examples
- 3 wk = 1.5 fn
- 12.5 wk = 6.25 fn
- 75 wk = 37.5 fn
Weeks to Fortnights table
| Weeks | Fortnights |
|---|---|
| 1 wk | 0.5 fn |
| 2 wk | 1 fn |
| 5 wk | 2.5 fn |
| 10 wk | 5 fn |
| 20 wk | 10 fn |
| 25 wk | 12.5 fn |
| 50 wk | 25 fn |
| 100 wk | 50 fn |
| 250 wk | 125 fn |
| 500 wk | 250 fn |
| 1,000 wk | 500 fn |
Common questions
Is wk to fn exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Fortnights to Weeks converter.
Mistakes to avoid
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
Background
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
For any value, use the Weeks to Fortnights Converter or browse all time converters.
Run your own numbers: Weeks to Fortnights Converter