Curtain Height Calculator
Find the right rod placement to make windows look taller.
Use the Curtain Height Calculator
This curtain height calculator helps place a curtain rod and choose a finished panel length from real window, ceiling, and floor measurements. It is a planning aid for creating a deliberate break, kiss, or puddle at the floor.
Open the interactive calculator to enter your measurements and generate a project plan.
Measure from the finished floor
Measure at the left, center, and right side of the window because floors and ceilings can vary. Use the intended rod position as the top reference and the finished floor, not a removed rug or temporary surface, as the bottom.
Confirm how the curtain attaches to the rod. Rings, clips, grommets, and rod pockets place the fabric at different distances below the rod.
Choose rod position and panel finish
Hanging above the casing can make the opening feel taller, but leave enough space for brackets and finials. Extend the rod beyond the window so open panels can stack without covering too much glass.
A floor kiss requires the most exact field measurement. A slight break is more forgiving. Puddled fabric is decorative but collects dust and may not suit doors, pets, or high-traffic rooms.
Confirm before ordering
Compare the calculated drop with the manufacturer's actual finished length and attachment method. Ready-made panels can vary slightly, so measure them before permanently mounting the rod.
Check radiator, sill, baseboard heater, and furniture clearances. Follow product safety guidance around heat sources.
Finished curtain length
rod attachment point − desired bottom point + selected break or puddle
The attachment point may sit below the top of the rod, depending on the hardware.
| Finish | Appearance | Practical note |
|---|---|---|
| Kiss | Just meets floor | Needs precise measurement |
| Break | Small fold at floor | Tolerates minor variation |
| Puddle | Extra fabric on floor | Decorative, higher maintenance |
Frequently asked questions
Should I round curtain measurements?
Enter the measurements you can verify, then keep the calculator's more precise result while laying out the project. Marking from one reference edge prevents small rounding differences from accumulating.
Should I measure in more than one place?
Yes. Walls, ceilings, and cabinets are rarely perfectly square. Measure at both ends and near the center, then plan around the tightest usable dimension.
Should curtains cover the window when open?
Usually the rod extends beyond the casing so much of each panel can stack beside the glass. The required extension depends on panel fullness and available wall space.