Casement Calculator

Calculating your casement window hardware has never been easier!

Just enter your sash size(s) below and then select the hardware you require.

When you've finished, simply click the calculate button and we will work out what you need and add it to your shopping cart.

If you need any help and advice, just give us a call on 0800 056 0471

Enter the dimensions for each sash

Qty Sash Type Glass Type Friction Stay Type Height
Weight (lbs)

Do you want to add Friction Stays to your order?


Do you want to add Espag Rods or Security Shootbolts to your order?


Do you want to add Espag Handles to your order?

When you are ready...


This should be the number of sashes

Sash Type

  • A - Side Hung Left Hand Sash
  • B - Side Hung Right Hand Sash
  • C - Top Hung Sash
  • D - Fixed Pane - No Stays Required

Friction Stay Type

  • Standard - Standard stay, no fire egress capability, no easy cleaning facility
  • Egress - These tays can be opened wider to allow fire egress
  • Easyclean - These stays can be opened then slid to one side to allow you to clean the outside pane

Still not sure? Download our PDF brochure

Glass Type

Enter the Glass type / combination for the sash you are entering into the calculator.

  • 3mm = Single-glazed 3mm glass
  • 4mm = Single-glazed 4mm glass
  • DG 4+4 = Double-glazed 4mm / 4mm glass
  • DG 4+6 = Double-glazed 4mm / 6mm glass
  • DG 6+6 = Double-glazed 6mm / 6mm glass

We use the glass combination you enter to calculate the sash weight. However, we prefer you to weigh your sashes and enter the information. You can over-type our calculation.

Calculated Weight

Please bear in mind that the onus is on the customer to supply accurate glazed sash weights. Our software can calculate approximate weights based on a common industry wide formula which has been used successfully for 25 years with little problem. We will not be liable to you for any loss of profits, administrative inconvenience, disappointment, indirect or consequential loss or damage arising out of any problem in relation to the goods and we shall have no liability to pay any money to you by way of compensation other than any refund we make under these conditions. Hardware that proves erroneous will have to be returned to us at your expense.