TwoCut Tools · DIY guide
How to Size Overlay Cabinet Doors and Cut Rails
Published November 3, 2026 · Independent planning guidance
Use opening dimensions, visible overlays, a meeting gap, stile width, and tenon depth to draft a frame-and-panel door cut list.
Confirm which door construction you are making
This calculator targets overlay frame-and-panel cabinet doors with two stiles and two rails per door. An overlay door sits over the cabinet opening. An inset door fits inside the opening and follows a different clearance calculation; a slab door has no separate rail and stile cut list. Identify the construction before measuring. The calculator can produce a precise number from unsuitable assumptions, so the project drawing and hinge choice still matter.
Use a reliable tape or rule and record the opening at several points. Cabinet openings can be out of square, especially after installation. Measure width near the top and bottom and height on both sides, then decide the usable reference dimensions. Do not automatically use the largest measurement if the door might collide with a nearby wall or another door.
Understand overlay and reveal
An overlay is the amount the finished door extends beyond the cabinet opening. The calculator asks for the overlay at each outside side and at the top and bottom. A thirty inch opening with a half inch overlay on each outer side has a combined outer door span of thirty one inches before any center gap. Vertical overlays add to the finished door height in the same way. A quarter-inch change in overlay changes the final cut size, so confirm hinge specifications first.
Reveal is the visible space around or between doors. For a pair of doors, enter the intended meeting gap between their inside edges. The calculator subtracts that gap once from the combined outer span, then divides the remainder by two. It does not add a center gap to a one-door cabinet. Check whether adjacent cabinets need a larger clearance so doors can open freely.
Calculate one or two door widths
For one door, add the two side overlays to the opening width. For a pair, add both outer overlays, subtract the meeting gap, and divide by two. With a thirty inch opening, half inch outer overlays, and an eighth inch meeting gap, each of two doors is 15.4375 inches wide. There are two doors, so the pair covers 30.875 inches with the specified gap. Keeping the arithmetic visible helps prevent a common error: subtracting the gap from each door instead of once from the whole opening.
The calculator supports one or two matching doors. It does not size unequal doors or an offset opening. If the opening is asymmetric, sketch each leaf and do a custom calculation. Check that the finished width works with the hinge’s adjustment range and any adjacent handles or drawer fronts.
Set finished height before cutting stock
Door height is opening height plus the top and bottom overlays. A twenty four inch opening with a half inch at each edge needs a twenty five inch finished door. Every stile runs the full finished height in this simple frame construction. A two-door pair therefore needs four stiles, each cut to twenty five inches. If your construction uses a different joint or decorative profile, check the assembly drawing before cutting.
Leave room for finishing and hinge adjustment in the design, but do not casually hide a clearance allowance inside the calculator’s geometry. If the overlay should be smaller, edit the overlay itself. That keeps the resulting dimensions understandable when another person reads the cut list.
Calculate rail cut length from the joint
The visible distance between two full-height stiles is the finished door width less twice the finished stile width. A rail with tenons extends beyond that visible distance into the stiles. Add two times the entered tenon depth to obtain the rail cut length. For a 15.4375 inch door with two inch stiles and three eighth inch tenons, the rail cut length is 12.1875 inches. Each door has a top and bottom rail, so a two-door pair needs four pieces at that length.
Some router-bit sets and cope-and-stick systems specify rail length by a different shoulder or profile rule. The entered tenon value must match the actual joint, including any profile-specific offset. Make one test joint from scrap and measure the assembled width before cutting all production rails.
Allow for panel movement separately
The calculator stops at the frame cut list. A floating wood panel requires room for seasonal movement and adequate groove engagement. Plywood or engineered panels may follow different allowance rules. Panel sizing depends on groove depth, material, panel thickness, and the joinery method, so inventing a generic panel dimension inside a door-width result would be misleading. Use the hardware and bit-set instructions for that step and test fit a sample.
Likewise, this page does not estimate board feet, veneer yield, or number of sheets. The related plywood and board-foot tools can help after the cut dimensions are confirmed. Grain direction and visible face matching may require more stock than a raw area calculation suggests.
Keep metric conversion exact
The unit selector accepts opening and joinery dimensions in centimeters and converts internally to inches. It then reports finished width and rail or stile cuts in the selected unit. A half inch overlay becomes 1.27 centimeters, and a thirty inch opening becomes 76.2 centimeters. These are exact physical conversions, not a recommendation to round a shop drawing to convenient nominal metric values. If your material and hardware are metric, enter their actual dimensions.
After switching units, look at every field. Door count stays one or two, while all linear measurements change units. A switch should not change the physical door size. If the cut list does change beyond display rounding, review whether an input was edited after the unit change or whether a supplier specification uses a different nominal size.
Check the paper cut list against a test assembly
Before production, mark the finished outer door dimensions on a drawing, then list stiles and rails separately with quantity, length, width, and grain direction. Confirm that the combined leaf widths plus the meeting gap equal the outer span. Test one frame dry before glue-up. For the two-door example, four 25 inch stiles and four 12.1875 inch rails should assemble into two doors 15.4375 inches wide when the specified joint is executed correctly.
The linked calculator provides the arithmetic and rejects impossible rail geometry, but it cannot verify the physical joint or cabinet squareness. Measure, make a test cut, and recheck the door against its actual opening and hinges. Those practical checks are far less costly than cutting a full batch of rails to an untested assumption.
Related calculator and planning tools
Enter your own dimensions in the Cabinet Door Cut List Calculator. Check the results against product packaging and the site before ordering.
Reference
For installation context and product terminology, see Rockler cabinet door routing and joinery guidance. The examples and calculations in this guide are independently written and use illustrative, editable inputs.