How Long Should Curtains Be? A Practical Length Guide (Sill to Puddle)

Felix Bain
2020-10-13T20:16:45+08:00

This article explains how long curtains should be by choosing the right endpoint, measuring after the rod is installed, and selecting float, kiss, or puddle floor lengths.

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TL;DR: Choose where you want the curtains to end (sill, below-sill, mid-wall, or floor), hang the rod first, then measure from the correct hanging point down to that endpoint. For floor-length curtains, decide whether you want a clean float above the floor, a “kiss” at the floor, or a slight puddle for drama.

Quick problem breakdown: why curtain length looks “off” (and why it matters)

Curtain length problems usually come from measuring before the hardware is installed, measuring from the wrong starting point (rod vs rings/clips), or choosing a length that doesn’t match the room’s function. The result can look visually unbalanced, feel impractical (dragging fabric), or make the window look shorter than it is.

Visual proportion: Too-short panels can make the window feel squat or unfinished.

Daily practicality: Too-long panels can drag, collect dust, and get stepped on in high-traffic spaces.

Light and comfort: If you’re aiming for a darker bedroom, length works together with placement and coverage to reduce stray light.

If you’re planning the full setup (rod height, width, and placement), start with how to hang curtains the right way, then use this guide to choose the exact length.

Solution 1: Pick the right endpoint (sill, below-sill, mid, or floor)

Before you measure, decide the “finish line” you want. The right endpoint depends on the room’s function and the look you’re after.

Sill-length: Ends at the window sill; practical for kitchens, radiators, or desks under windows.

Below-sill: Ends slightly below the sill; still practical, a bit more polished.

Mid-length: Ends between sill and floor; casual and functional.

Floor-length: Ends at or near the floor; the most classic “finished” look.

Takeaway: The “right” curtain length starts with choosing a clear endpoint—sill, below-sill, mid-wall, or floor—before you measure or buy panels.

Solution 2: Measure after the rod is installed (and measure from the correct point)

Measure only after the rod (or track) is in place. Then measure down to your chosen endpoint using the correct starting point for your header style.

1. Install the rod at your chosen height.

2. Choose the endpoint (sill, below-sill, mid, or floor).

3. Measure from the correct hanging point:

Rod pocket / tabs / back tabs: measure from the top of the rod.

Rings / clips: measure from where the ring/clip holds the fabric.

For a guided walkthrough, use Deconovo’s Measurement Tool.

Takeaway: Hang the rod first, then measure from the exact point the curtain will hang (rod top for pockets/tabs, ring/clip position for rings/clips) down to your chosen endpoint.

Solution 3: For floor-length curtains, choose a “floor finish” that fits your lifestyle

Floor-length isn’t one fixed number—it’s a style choice. Pick the finish that matches how the room is used.

Float: Ends just above the floor for a clean look and easier cleaning in busy rooms.

Kiss: Lightly touches the floor for a tailored, custom look.

Puddle: Extra fabric pools on the floor for a dramatic, romantic effect.

Takeaway: If you want floor-length curtains, decide whether you prefer a float above the floor, a kiss at the floor, or a puddle—each option changes the target measurement.

Solution 4: Set rod height to support the length you want (especially for “taller-looking” rooms)

Rod height and curtain length work together. Hanging the rod higher can make windows look taller, but it also changes the panel length you need.

If your goal is a taller look, you’ll typically hang the rod higher than the frame, then measure to the floor finish you chose.

If you have low ceilings, placing the rod closer to the ceiling can visually stretch the wall height.

If you have taller ceilings, you may need longer panels to avoid an accidental “too short” look.

For a room-size formula and clear examples, read How High Should You Hang Curtain Rods? A Simple Formula for Small and Large Rooms.

Takeaway: Choose your rod height first, then measure down to your endpoint—rod height directly determines which curtain length will look intentional.

Solution 5: Don’t forget width and coverage (fullness affects the “finished” look)

Even the perfect length can look wrong if the curtains are too narrow. Plan for enough fabric so the panels look full when closed and still stack neatly when open.

As a practical starting point, many homeowners aim for fuller coverage rather than flat, tight panels.

For bedrooms where light control matters, prioritize coverage and placement alongside length.

If you’re shopping for bedroom light control, start with Custom Blackout Curtains. For ceiling-track setups, see How to Hang Curtains from the Ceiling.

Takeaway: Curtain length looks best when paired with enough width for coverage and fullness, especially if you want a darker room.

When you should replace curtains instead of adjusting length

Sometimes hemming or rehanging isn’t the best fix. Consider replacing your curtains if:

The panels are significantly too short for your chosen endpoint and can’t be let down.

The fabric is visibly warped, stretched, or permanently wrinkled in a way steaming can’t improve.

You’re changing the room’s function (for example, converting a room into a bedroom where light control matters more).

You’re switching hardware (like moving from a standard rod to a ceiling track) and the existing header style no longer works.

For broader setup guidance beyond length, revisit how to hang curtains the right way.

For background on why reducing unwanted light at night can matter for sleep, see public health guidance from the CDC’s sleep hygiene recommendations. For energy-focused home guidance on managing heat loss and gain through windows, reference the U.S. Department of Energy’s Energy Saver: window coverings.

FAQ

What curtain length looks “most finished” in a typical room?

Floor-length curtains usually look the most finished, especially when they either float just above the floor or lightly kiss the floor.

Should curtains touch the floor or hang above it?

Both can be correct: floating slightly above the floor is practical, while kissing the floor looks tailored and polished.

How do I measure curtain length if I’m using rings or clips?

Measure from where the ring or clip holds the curtain fabric (the real hanging point) down to your chosen endpoint.

Are café curtains a good option for kitchens?

Yes. Café curtains cover the lower part of a window for privacy while keeping the top open for natural light.

What if my ready-made curtains are too long?

Too-long curtains are often easier to fix than too-short ones because you can hem them to your desired finish.

How does rod height affect curtain length?

The higher you place the rod, the longer the panel must be to reach the same endpoint, especially for floor-length styles.

What curtain type should I consider if I want a darker bedroom?

Start by choosing curtains designed for light control, then measure length carefully after installing the rod. You can browse Custom Blackout Curtains as a starting point.

Where can I learn the full setup for hanging curtains (not just length)?

Use the step-by-step pillar guide: how to hang curtains the right way.