To cut hinge slots in a door, mark hinge locations, score the outline, and remove waste to full depth for a flush, accurate fit.
Cutting crisp hinge slots, also called hinge mortises, lets a door swing true and latch without rubbing. This guide walks you through layout, depth control, and clean cuts with a chisel or a router. You will see where to set the hinges, how deep to cut, and how to avoid tear-out on the edge of the door.
Tools, Materials, And Setup
Good prep keeps the job smooth and safe. Lay the door across two stands, hinge edge up. Clamp it so it cannot rock. Set bright light on the edge. Tape the face to guard the finish near each mortise. Keep a small bin for screws so nothing rolls away.
| Item | Why You Need It | Notes |
|---|---|---|
| Sharp 1 in. chisel | Scores lines and pares waste | Hone until it shaves end grain |
| Utility knife | Scores the outline to stop chip-out | Fresh blade only |
| Router with hinge jig | Fast, repeatable depth | Use a 1/2 in. straight bit |
| Combination square | Sets backset and hinge length | Lock the reading |
| Tape measure | Locates top and bottom hinges | Mark both door and jamb |
| Pencil and awl | Clear layout marks | Punch screw pilot points |
| Depth gauge | Checks mortise depth | A caliper works too |
| Drill/driver | Pre-drills and drives screws | Use a clutch setting |
| Painter’s tape | Protects the finish at edges | Tape right up to the line |
| Safety gear | Eyes, ears, dust mask | Keep chips out of eyes |
Hinge Placement Basics That Never Fight The Door
Most interior slabs hang on two or three butt hinges. A common layout puts the top hinge 5 in. down from the top and the bottom hinge 10 in. up from the bottom. On a tall or solid-core slab, add a third hinge centered between them. This spacing spreads the load and keeps the latch side from sagging over time. Trade guides echo this spacing and tie it to smooth swing and long screw bite in the stile.
Pick hinge size to match door thickness and weight. For many hollow-core interior doors, a 3-1/2 in. hinge works. A 1-3/4 in. thick entry door may call for a 4 in. hinge. Hinge leaves marked “template” follow a shared hole pattern, so screws line up the same way across brands.
How to Cut Hinge Slots in a Door With A Chisel
This path suits a one-off install with basic tools. The steps below give a tight seat and crisp corners.
Step 1: Mark And Knife The Outline
Hold the hinge against the edge, knuckles outward, and trace the leaf. Knife the lines deeply. Knifing severs fibers so the surface outside the mortise stays clean when you pare.
Step 2: Set The Backset
Set a square to the hinge leaf setback so the barrel sits just proud of the door edge. Transfer that line along the edge for each location. A consistent setback keeps gaps even from top to bottom.
Step 3: Chop To Depth
Use the chisel to chop a shallow trench on the waste side, bevel in. Then pare flat chips with the bevel down. Work in thin slices until depth matches the leaf thickness. Check depth with the hinge; the leaf should sit dead flush with the edge. New to hand work? A quick primer on wood-chisel technique shows the safe stance and the bevel-down paring move that keeps cuts flat.
Step 4: Drill Pilot Holes
Seat the hinge and mark holes with an awl. Drill pilots straight and stop short to avoid blowout. Use a self-centering bit if you have one so screws pull the leaf to the layout.
Step 5: Test With Screws
Drive two screws per leaf and test the swing with the door set in the opening. If the gap pinches at the head, deepen the top mortise a hair; if the gap pinches at the floor, tune the bottom.
Router Method For Speed And Repeatability
If you are wondering how to cut hinge slots in a door on a first project, the process starts with sharp layout, a scored outline, and patient depth control.
A trim router paired with a hinge template gives fast, repeatable pockets. This shines when you are hanging several doors or matching a prehung frame.
Choose The Jig
Pick a template that fits your hinge size. Many jigs use a guide bushing. Others ride on a bearing bit. Set stop blocks for the top and bottom locations so each mortise lands where planned.
Dial The Depth
Set the router to the exact leaf thickness. Make shallow passes and stop the cut just shy of your knife lines. Clean the corners with a chisel to square them to the hinge.
Make The Cut
Clamp the jig, plunge, and sweep the waste. Keep the base flat and the cord clear. Vacuum chips between passes so the base stays level and the pocket stays true.
Close Variation: Cutting Hinge Slots In Your Door — Pro Rules
Hinge hardware follows shared patterns, which helps you match parts and drill pilots that land in the right place. Builders call these patterns “template” layouts, defined in ANSI/BHMA A156.7. That shared pattern keeps screw holes consistent across brands. When you need replacement leaves later, you can swap them without redrilling the stile.
Depth, Backset, And Clearance
Mortise depth should match the leaf. If the leaf sits proud, the door rubs the stop. If it sinks below flush, the barrel binds. Backset is the distance from the hinge edge to the door face or frame stop, and trade references note the door backset runs 1/16 in. less than the frame backset for swing clearance (hinge backset detail). A small offset on the door keeps swing clearance. For a 1-3/4 in. slab, many metal frames use a slightly larger frame backset; the door backset is trimmed by 1/16 in. to clear the stop.
Set gaps with care. Aim for an even reveal along the head and strike side. Small tweaks at the mortise depth move the reveal enough to save you from planing the latch edge later.
Common Sizes And Leaf Thickness
Use this quick reference for typical interior and entry sizes. Check the leaf gauge stamped on your hinge and match the pocket to it.
| Door Type | Hinge Size | Typical Mortise Depth |
|---|---|---|
| Hollow-core interior, 1-3/8 in. | 3-1/2 in. | ~1/16–3/32 in. |
| Solid-core interior, 1-3/8 in. | 3-1/2 in. | ~3/32 in. |
| Solid-core interior, tall | 4 in. | ~1/8 in. |
| Entry door, 1-3/4 in. | 4 in. | ~1/8 in. |
| Heavy entry, 1-3/4 in. | 4-1/2 in. | ~1/8–5/32 in. |
| Fire-rated steel door | 4-1/2 in. | Per listing |
| Exterior with storm door | 4 in. | ~1/8 in. |
Marking Tricks That Raise Accuracy
Stack setup blocks cut to hinge length. Place them on the edge and butt the template to the blocks for fast, repeatable distance. On paint-grade work, a strip of tape at the outline lets the knife glide and stops fibers from lifting. Color code each location so the same hinge returns to the same pocket after dry fits.
If the frame is already mortised, transfer positions with a story stick. Mark top, center, and bottom on the stick, then lay those lines on the slab. This keeps spacing consistent and saves you from reading a tape over and over.
Fixes For Common Slip-Ups
Proud Hinge Leaf
If the leaf stands proud and the door hits the stop, pare the pocket in thin shavings. Back off screw tension first so the leaf can settle.
Sunken Leaf
If the hinge sits low and binds at the barrel, glue in a tight veneer shim and recut to depth. Grain should run the same way as the stile.
Misplaced Pilot Holes
Pack the hole with a hardwood plug and glue. Let it set, then re-drill dead center. A self-centering bit keeps the screw from drifting to the edge.
Chipped Edge
Wick thin CA glue into the chip and clamp a flat caul over tape. After cure, pare flush and touch up the finish.
Safety And Care
Keep hands behind the cutting edge. Chisel with light taps, not heavy blows. With a router, keep the base flat before you plunge. Sweep chips clear so the bit does not ride on debris. Wear eye and ear protection. Keep cords away from the bit path.
How to Cut Hinge Slots in a Door With A Template Kit
Many kits include bushings, stops, and sample leaves. Clamp the body to the edge, set the stops to your hinge length, and test on scrap. Once depth and fit look right, move to the slab. This method shines when you must match a prehung jamb with crisp pockets at set spacing.
Checklist Before You Hang The Door
Once you see how to cut hinge slots in a door with either a chisel or a small router, the rest of the hang goes smoothly since the reveals track your layout.
Dry fit each hinge in its pocket. Check flush with a fingertip. Confirm barrel setback, screw bite, and pilot depth. Label hinges top, middle, and bottom. Bag the screws. When every seat is flush and square, mount the leaves and move to the jamb. Have a helper ready for the lift and set.