How to Read and Interpret Scales

Scaling is a method used to draw a structure at an appropriate size and keep the proportions the same.  Scales are generally expressed as ratios and the most commonly used scales are:

 

  • 1:100 – one centimetre is equivalent to one metre/100 centimetres (this is best and easiest to use for residential developments)
  • 1:200 – one centimetre is equivalent to 2 metres/200 centimetres (this is best and easiest to use for industrial, commercial or larger developments)
  • 1:50 – one centimetre is equivalent to ½ of a metre/50 centimetres
  • 1:20 – one centimetre is equivalent to ¼ of a metre/20 centimetres

Using a scale ruler to measure sizing on plans is much easier because the conversions are already made for us.