In this post, you’ll learn:
- How to calculate door frame quantity
And,
- How to calculate wood quantity for door frames.
After learning these, you’ll be able to calculate the required door frames for a complete building project easily.
So, let’s learn…
How To Calculate Door Frame Quantity?
In modern buildings, several types of door frames are used. Such as Wooden frames, PVC frames, and Aluminium frames, etc.
Here we’ll focus on calculating wooden door frames.
I’ll show you how to calculate door frames for a whole apartment. Once you’ve learned the technique, you’ll be able to calculate for a whole building project.
Let’s say, you need to know the required door frames quantity for the following apartment:
To calculate door frame quantity for this apartment…
First, Count The Same Type Of Door Frames Together.
Here, D0 is for the main door, D1 is for bedrooms, D2 for the bathroom, and D3 for the kitchen.
- D0 = 1
- D1 = 2
- D2 = 1
- D3 = 1
Next, Get The Size Of The Door.
You’ll have a door schedule in your architectural drawing book like this:
With the door schedule, we get…
- D0 = 3′-9″ × 7′-0″ = 1 nos
- D1 = 3′-4″ × 7′-0″ = 2 nos
- D2 = 2′-6″ × 7′-0″ = 1 nos
- D3 = 3′-0″ × 7′-0″ = 1 nos
Whatever the door schedule is, you have to keep one thing in mind.
That is, there is a standard door frame width.
They come like… 24″, 27″, 30″, 33″, 36″, 39″, 42″, etc.
In our example schedule, there is a door frame, that is D1, which is 3′-4″ width.
That means, 40 inches.
That doesn’t fit in the standard door frame width.
So, we need to reduce that to 39″. That is 3′-3″.
The rest of the door frames is okay with the standard door frame width.
So, we can write…
- D0 = 3′-9″ × 7′-0″ = 1 nos
- D1 = 3′-3″ × 7′-0″ = 2 nos
- D2 — 2′-6″ × 7′-0″ = 1 nos
- D3 = 3′-0″ × 7′-0″ = 1 nos
But, a carpenter can’t make door frames with this data only. He needs more data.
That is the thickness and width of jambs and heads.
So…
Finally, Define The Thickness And Width Of Jambs And Heads
In residential buildings, we generally use the width of jambs and heads for:
- The main door frame = 11″
- Internal door frame = 6″
- Bath door frame (where tiles will be laid on the wall) = 6½″
- Kitchen door frame = 6½″
And the thickness is 2½″.
So, for our example apartment:
- D0 = 11″ × 2½″ × 3′-9″ × 7′-0″ = 1 nos
- D1 = 6″ × 2½″ × 3′-3″ × 7′-0″ = 2 nos
- D2 = 6½″ × 2½″ × 2′-6″ × 7′-0″ = 1 nos
- D3 = 6½″ × 2½″ × 3′-0″ × 7′-0″ = 1 nos
If you place an order for making door frames with this data, a carpenter can easily make frames for you.
But, we sometimes need to calculate wood quantity for door frames.
So, let’s see…
How To Calculate Wood Quantity For Door Frames
I’ll show you the calculation process of wood quantity for our main door frame.
Once you learned the process, you’ll be able to calculate wood quantity for other door frames.
And, Here is our main door frame:
The formula for calculating wood quantity for a door frame is,
= (2 × Jamb width × jamb thickness × frame height) + (head width × head thickness × frame width)
= (2 × 11″ × 2½″ × 84″) + (11″ × 2½″ × 45″)
= 4620 + 1237.50
= 5857.50 cubic inches
= 3.38 cubic feet.
This is the required wood quantity for our main door frame.