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Hip Roof Framing Calculator - With Rafter Angle Cutting Templates and Setout Plans - Metric

Porch Roof Extensions
From outside of wall to outside of wall (long side)
Wall Length
Rafter Thickness
From outside of wall to outside of wall (short side)
Wall Width
Rafter Depth

Wall Height Hip Thickness
Wall Thickness Hip Depth

Roof Angle Ridge Thickness
Overhang (level) Ridge Depth

Include diagram with 4 individual roof segments and dimensions (flat)

Roof sheets extended past rafter ends (on angle)

Rafter Spacing
Hip Adjustment
Increase birdsmouth depth to bring hip edges level with common rafters

Chamfer hip edges to bring level with common rafters
Exact Spacing keeps entered spacing and adjusts 2 end ridge spaces if necessary.
Adjust Spacing adjusts to nearest under or equal to entered spacing.
Rafter Spacing Type

Include running measurements plan for ridge, wall and hip placement

Birdsmouth Seat Cut

? Birdsmouth Seat Cut
Creates a link to save or Share current calculation
Share this Calculation
Possible Alternate Equal Rafter Centres

Hip roof framing calculator plan diagram with full dimensions

Rafter Join Detail

Hip roof framing - hip to common to ridge join diagram
Print full scale paper templates - cut and fold over wood to mark and cut angles.

(Adjust to suit)

Trim rafter tails after placement For a good straight fascia, add an extra 20 mm or so to the tails of all your rafters (total length). After they're up, you can snap a line to mark and trim the tails in a nice straight line, to make up for any ridge warp or marking, cutting and fixing errors.

Cut 1 rafter and use as pattern Mark, cut (and test fit) 1 common and 1 hip, then use as patterns to mark and cut the rest.

Common rafter diagram with full dimensions

Hip rafter diagram with full dimensions

Hip roof framing rafter cut angle template diagram Circular Saw Bevel Setting Hip and Creeper Side Cut Settings If using a Circular Saw or Compound Miter saw, set saw bevel angle to 45° to obtain Creeper and Hip side angles.

With the saw bevel angle set to 45°, cutting hips and creepers at the plumb cut angle will produce correct side angles.

See Saw Miter and Blade Angle Settings

Set Bevel Gauge from this page with your Phone.
Set Bevel Gauge from Phone

Left click, release then drag to measure at scale in diagram below - Enlarge diagram scale for more accurate measurements.

Roof Angle Overhang Scale

Hip roof framing profile diagram with angles, heights and volumes

Hip rafter detail diagram Creeper rafter detail diagram - left side

Circular Saw Hip Cuts To mark and cut hip plumb and side cuts with a circular saw - Print a Paper Template (easy + accurate) - OR:
1: Mark the end plumb cut angle line ( back from square) on both sides of the hip. This is the pointy end of the hip. (Don't cut yet)
2: Measure back from this line and mark a second, parallel line on both sides of the hip. (This is the line to cut along)
3: Set circular saw blade tilt angle to 45°, cut 1 side along second line, with blade tilted toward pointy end, then flip and cut other side the same.

Print and cut full scale paper templates - fold over wood to mark and cut angles (easy)

Hip rafter full scale cutting template Creeper rafter full scale cutting template Common rafter full scale cutting template

Porch Roof Extensions
For hip roof porch extensions from an existing building wall, you can use half the calculator results. Enter the extension wall length into 'Wall Length' and double the extension wall width, then minus ridge thickness, into the 'Wall Width' entries. (minus ridge thickness to allow for ridge becoming pole plate - roof peak will be slightly higher - Ridge Thick must be same as Common).
The resulting roof diagram is then 'cut in half' along the ridge top line, with bottom half being the roof extension, with the ridge and 2 end (King) common rafters becoming Pole Plates that attach to the existing building wall.

The roof extension length must be at least twice as long as its width, or the 2 hips will meet before they reach the existing building wall. If the extension length is half the extension length, the 2 hips will meet at the existing wall, and the roof will come to a peak (with no ridge), like half a pyramid.

If the extension length is less than twice the width, the 2 hips will meet before they reach the existing wall, and you'll need a ridge extending from the existing wall at 90° to join the hips where they meet. In this case, you can enter the extension wall length into the 'Wall Width' and double the extension wall width into 'Wall Length', then 'cut the diagram in half' length-ways at the centre. (move or add 2 commons to become poll plates at existing wall)
Top ↑
Porch Width
Ridge Thick
For Porch Width 3000, enter 5950 Wall Width

DON'T BREATH THE DUST If you're cutting blocks, concrete, stone or ANYTHING and there's DUST - DON'T TAKE THE RISK
Don't cut it, or cut it wet so there's NO DUST - Silicosis Sucks
And if you're cutting wet, wear a mask - theres dust in the spray mist too!

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