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Clothesline drying time calculator

Find out when your laundry will be dry, from the weather forecast for your location.

Direct sunlight is only taken into account when using the forecast. With several clotheslines, the inner lines are usually shaded by the outer ones, so leave it unchecked for them.
What are you hanging? Choose the thickest item:
Drying time: Please enter the data and press "calculate"

Why is the calculator important?
Image of clothlines with a clock Hanging laundry on the lines is good for the environment and also saves electricity and money. Use the calculator to:
  • Make sure the laundry dries before it starts raining.
  • If you are drying at home, know if you should turn on the heating or a fan to speed up the drying process.
  • If you need a shirt for a certain event, then know whether to wash it now or if you can also wash it tomorrow.

How do I check that the laundry is dry?
  • Check the item that dries the slowest first, usually the thickest one.
  • Touch the middle of it and check that it feels dry.
  • If it does, also check the thick parts of the item, for example a built-in waistband.
  • Check areas like where the sleeve joins the shirt: folds can form there when the laundry is hung, and they dry the slowest.
  • Check also where the clothespins hold the item: the fabric is pressed together there and dries slowly.

Rules of thumb for the calculator
  • If you hang laundry at home without heating, the temperature will be the average day and night, as well as the humidity.
  • If you hang laundry at home with heating, the temperature will be the maximum temperature, i.e. the midday temperature.
  • Towels, winter shirts, or jeans are 2 mm thick.
  • T-shirts are 1 mm thick.
  • Moisture-wicking shirts have an effective thickness of 0.5 mm.
  • The calculator works only above zero degrees Celsius.

Tips
  • If you hang laundry at home and do not turn on the heating, you should open a window (preferably two windows or a window and a door).
  • The laundry that dries the slowest should be put on the outer lines.
  • It is better to hang the laundry in a spacious way.
  • It is a good idea to hang clothes inside out to reduce sun damage to the fabric.
  • If the clothes were slightly folded when hung (for example near the sleeves), their effective thickness is doubled.
  • Shake your clothes before hanging them, this will cause fewer wrinkles and can remove any dirt left on the clothes.
  • If possible, hang the laundry with the clotheslines parallel to the direction of the average wind.
  • If the wind is strong, it is better to use more clothespins (clothes pegs).