Curtain Length Guide

Choose a hem style and enter the height from the floor to your rod to see the curtain length you need and the closest standard length.

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This curtain length guide works out the ready-made curtain length that fits your window. Enter the curtain style and the height from the floor to where the top of the curtain hangs, and the page calculates the length you need and names the closest ready-made length. It runs in your browser, is free, and needs no sign-up. Nothing you type is uploaded.

Also searched as curtain length, standard curtain length, or curtain length calculator, this page lists the standard curtain lengths 63, 84, 94, 95, 96, 108 and 120 in (inches and cm), each with the guides that list it. Guides disagree on 94, 95 and 96, so those sizes appear as separate rows. A second table shows where the hem ends for each style, from sill to puddle.

How to use the Curtain Length Guide

Choose the curtain style: floor, sill, apron, trouser break or puddle.
Enter the rod height, which is the height from the floor to where the top of the curtain hangs. You can type it in in, ft, cm or m.
For sill and apron styles only, enter the height of the window sill in the same way.
Optional: open more options and type a hem offset in inches. Leave it blank to use the default: 1/2 in for sill and floor, 4 in for apron, 2 in for trouser break and 3 in for puddle. Typing a number replaces the default.
Read “Curtain length needed”. It is calculated from your inputs.
Check “Closest ready-made length”. The page also shows the next length up and the next length down, with how many inches longer or shorter each one is than the length calculated.
If a warning or error appears, change the matching input and check again. Warnings appear for a rod height outside 36 to 156 in, or for a length longer than 120 in or shorter than 63 in. Errors appear for a missing or zero height, a sill at or above the rod, a negative offset, or a hem that ends above the curtain top.

The presets give you a starting point. Floor uses a rod at 90 in. Sill and apron use a rod at 56 in and a sill at 34 in. Puddle uses a rod at 90 in. Load one, then change the numbers to match your window.

How is the curtain length calculated?

The tool starts from the rod height and subtracts or adds a set amount that depends on the style. For floor length, the length needed is the rod height minus the gap above the floor. For sill and apron styles, the sill height and the hem offset are included in the calculation. For trouser break and puddle, the extra fabric is added to the rod height.

The formulas are:

Floor: rod height minus the gap above the floor
Sill: rod height minus (sill height + offset)
Apron: rod height minus (sill height − offset)
Trouser break and puddle: rod height plus extra fabric

With the default floor settings and the rod at 90 in, the length needed is 89.5 in (227.3 cm). The closest ready-made length is 84 in, which is 5.5 in shorter, and 96 in is 6.5 in longer.

A rod at 84.5 in with a floor length gives exactly 84 in, and the page says that length matches. A puddle curtain with the rod at 7.5 ft (90 in) needs 93 in, so the closest ready-made length is 96 in, which is 3 in longer.

An apron curtain with the rod at 80 in and the sill at 34 in needs 80 − (34 − 4) = 50 in. That is shorter than the shortest ready-made length listed, 63 in, so a warning appears.

Why do standard curtain sizes vary?

Standard sizes come from buying guides published by retailers and publishers. These guides are not a single standard, so they do not always agree. Most list 96 in, one lists 94 in, and two list 95 in. The chart shows each of these separately, and the page does not decide which one is correct for your room.

The guides also disagree on where an apron curtain ends: about 4 in below the sill in one guide and about 1 in below the frame in another. The page starts at 4 in below the sill and shows both in the hem-position table. For the other styles, the table lists floor length as 3/8 in to under 1 in above the floor, trouser break as about 2 in extra on the floor and puddle as 3 to 8 in extra on the floor, with the guides each figure comes from.

Because the sources differ, the results are calculated from your inputs and the figures from the named sources. They are not a fixed rule for any particular window.

Sources (checked 15 October 2026): bobvila.com · amandakatherine.com · excitingwindows.com · linenchest.com · blog.kwikhang.com · engineerfix.com · dgfloors.com

Worked examples

Input	Result
Floor length (just above the floor), floor to rod 90 in	length needed 89.5 in; closest ready-made length 84 in
Floor length (just above the floor), floor to rod 84 in	length needed 83.5 in; closest ready-made length 84 in
Apron length (just below the sill), floor to rod 66 in	length needed 36 in; closest ready-made length 63 in
Puddle (extra fabric on the floor), floor to rod 7.5 ft	length needed 93 in; closest ready-made length 96 in
Floor length (just above the floor), floor to rod 2.4 m	length needed 94 in; closest ready-made length 96 in

Calculated by the tool above; open it with the same values to see each step.

Frequently asked questions

What is a standard curtain length?

Standard curtain lengths are the ready-made sizes that stores sell, such as 84, 96 and 108 in. The sizes listed here come from named buying guides, and those guides do not fully agree.

Is the result from this curtain length calculator correct for my room?

The result is calculated from the inputs you enter, and it names the closest ready-made length. It does not judge what is right for your room. Check the numbers against your own measurements.

Why do I see 94, 95 and 96 in as separate rows?

Guides disagree on these three sizes. Most guides list 96 in, one lists 94 in, and two list 95 in, so the page shows each size on its own row.

Why are 94 and 95 in not used for the closest length answer?

The nearest-length answer uses 63, 84, 96, 108 and 120 in only. Your result can still be compared with the 94 and 95 in rows in the chart.

What happens if the length needed is shorter than 63 in?

A warning appears because the length is shorter than the shortest ready-made length listed. Check your rod height and style, then change the inputs if needed.

Is my information uploaded anywhere?

No. The tool runs in your browser, so nothing you type is uploaded. It is free and needs no sign-up.

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