RV blinds are measured by identifying the mount type, measuring the actual mounting opening in several places, checking headrail depth and obstructions, and recording width before height to the nearest 1/8 inch. For inside mounts, use the narrowest width and tallest height; for outside mounts, size the blind to cover the opening and accommodate its brackets.
Key facts at a glance
Measure every RV window separately because factory openings can vary within the same coach.
Record measurements as width x height, such as 24 3/8 inches W x 36 1/2 inches H.
Inside-mount width uses the smallest measurement from the top, middle, and bottom.
Inside-mount height uses the largest measurement from the left, center, and right.
Measure the valance or mounting cavity, not the old blind, when the existing blind may be damaged or incorrectly sized.
Do not apply a fixed deduction or addition unless the blind manufacturer gives ordering instructions for that model.
Before You Start Measuring RV Blinds
Measuring one RV blind usually takes 10-20 minutes and requires a steel tape measure, pencil, paper or a phone note, and a flashlight. The task is low difficulty, but ordering accuracy depends more on identifying the mounting surface and obstructions than on reading the tape.
Remove loose curtains, open the window, and raise or lower the existing shade enough to expose the headrail, side guides, bottom anchors, or mounting brackets. Do not remove a functional blind until you have photographed its hardware and recorded how the tension system is attached.
Tools and information checklist
| Item | Recommended specification | Why it matters |
|---|---|---|
| Tape measure | Steel blade, 1/8-inch graduations | Fabric tapes can stretch and curl |
| Recording method | Paper worksheet or phone note | Prevents mixing windows |
| Inspection light | LED flashlight, 100-300 lumens typical | Reveals tapered valances and hidden brackets |
| Straightedge | 12-24-inch ruler | Checks whether a frame or valance is square |
| Product information | Brand, model, installation diagram | Determines deductions and depth requirements |
Record the RV year, manufacturer, model, window location, and existing shade type. A 2021 Class C may have different window construction from a 2021 travel trailer, and a windshield-side window may use a different shade cassette from a bedroom window.
Step 1: Decide Which Mount Type You Have
An inside-mount RV blind fits within the window recess, casing, or valance opening; an outside-mount RV blind attaches to the wall, trim, or a surface beyond the opening. The correct category depends on where the new headrail and side hardware will sit, not on whether the old blind appears to cover the glass.
Look above the window and identify the solid surface that can support the brackets. Padded fabric valances often conceal a narrow wood, plastic, or aluminum mounting cavity. If the bracket sits within that cavity, treat the order as an inside mount unless the manufacturer’s template says otherwise.
| Mount type | Measure | Typical coverage approach | Main risk |
|---|---|---|---|
| Inside mount | Recess or valance opening | Fit within the measured cavity | Headrail may be too deep |
| Outside mount | Wall or trim area to be covered | Add overlap for privacy and light | Bracket may hit trim or wiring |
| Door mount | Door recess or door face | Preserve door and handle clearance | Blind can collide when door moves |
| Existing cassette replacement | Hardware opening and product dimensions | Match the replacement system | Similar-looking systems may differ |
If a valance can be removed without damaging the fabric, inspect behind it before ordering. A visible glass width can be substantially different from the usable bracket width.
Can the old blind tell you the replacement size?
The old blind provides useful information about hardware location, but it is not automatically the correct replacement size. Fabric can sag, rails can shift, and a factory-installed shade may have been cut for a different trim piece.
Measure the opening and the mounting surfaces first. Then measure the old blind as a secondary check, noting whether the dimensions refer to the fabric, headrail, cassette, or finished outside width.
Step 2: Inspect the Window and Mounting Area
Inspect the entire travel path before taking final measurements. RV windows commonly include crank handles, latches, screen frames, emergency-exit hardware, insect screens, wall curvature, and padded valances that can prevent a shade from sitting flat.
Open and close the window if the new blind will overlap the frame. Operate the crank through its full arc. A shade that clears the handle when closed can still bind when the window is opened for ventilation.
Check these locations:
- The top mounting surface, including screws and bracket positions.
- Both side edges, including screen tracks and trim lips.
- The bottom sill, latch, anchor, and any protruding molding.
- The front projection of the valance, crank, handle, and cassette.
- The path of a door, slide-out, or emergency-exit window.
A practical rule is to record the obstruction’s projection from the mounting plane. For example, if a crank projects 1 1/4 inches into the room and the proposed headrail is 1 1/2 inches deep, the shade may need spacers, an outside mount, or a different product.
Step 3: Measure the Inside-Mount Width and Height
For an inside-mount RV blind, measure the clear opening three times across the width and three times down the height. Use the smallest width and largest height unless the product instructions specify a factory deduction or a maximum finished size.
Hold the steel tape against the actual mounting surfaces. Measure from the left inside surface to the right inside surface at the top, middle, and bottom. Then measure from the top mounting surface to the sill at the left, center, and right.
| Measurement | Take readings | Number used for sizing |
|---|---|---|
| Inside width | Top, middle, bottom | Smallest reading |
| Inside height | Left, center, right | Largest reading |
| Recess depth | Front edge to rear obstruction | Minimum clear depth |
| Diagonal check | Top-left to bottom-right, reverse | Similar diagonals indicate squareness |
Example: if the width readings are 24 1/2, 24 3/8, and 24 7/16 inches, record 24 3/8 inches as the narrowest opening. If the height readings are 35 7/8, 36, and 35 15/16 inches, record 36 inches as the opening height.
Do not round a tight opening upward. A headrail ordered wider than the smallest clear width may not enter the cavity, especially when the valance tapers toward the top.
How do you measure an RV blind inside a padded valance?
Measure the usable cavity inside the valance at the exact level where the brackets will mount, then measure its height to the lowest point the shade must reach. Padded valances can be narrower at the top, so the top measurement may control the order even when the lower opening appears wider.
Use a flashlight to find hidden staples, fabric folds, screw heads, and angled side returns. If the front fabric hides the rear mounting surface, measure the available depth at several points and confirm the result against the product’s installation diagram.
For a pleated shade, the fabric may fit in a shallow cavity while its headrail does not. For a roller shade, the cassette diameter and rear roll clearance can determine fit even when the visible glass opening is large enough.
Step 4: Measure Mounting Depth and Hardware Clearance
Depth is the distance available from the mounting face to the nearest obstruction, and it must accommodate the entire headrail, cassette, fabric roll, and operating hardware. A window can have adequate width and height but still reject a blind because the crank, screen, or valance blocks the headrail.
Measure depth from the proposed bracket surface to the closest obstruction, not from the glass to the room. Compare that number with the manufacturer’s minimum recess depth and the required fully recessed depth.
| RV blind type | Typical hardware depth | Clearance issue to verify | Typical price per window |
|---|---|---|---|
| Pleated day/night shade | 1-1 1/2 inches | Headrail and tension guides | $40-$90 |
| Roller shade | 1 3/4-2 1/2 inches | Cassette diameter and roll clearance | $80-$180 |
| Aluminum mini blind | 1-2 inches | Slat tilt and hold-down clips | $25-$50 |
| Cellular shade | 2-3 inches | Cellular stack and side tracks | $60-$130 |
These are typical planning ranges, not universal specifications. MCD Innovations, Carefree of Colorado, Lippert, and other RV shade manufacturers use different brackets and cassette profiles, so the product drawing controls when its requirement conflicts with a general range.
Allow space for the shade in both operating positions. A roller shade may need more front clearance while rolling than while fully lowered, and a pleated shade may stack into the valance at the top.
Step 5: Measure an Outside-Mount RV Blind
For an outside mount, measure the area the blind must cover and then add the overlap required by the product and the mounting surface. A common planning allowance is 1-1 1/2 inches beyond each side and 1-1 1/2 inches above and below, but the manufacturer may prescribe different finished dimensions.
Measure the width of the glass or opening, the height of the glass or opening, and the available flat wall or trim around it. Confirm that the added width will not cover a neighboring latch, seal, cabinet edge, or slide-out trim.
| Outside-mount check | Measurement example | Ordering consequence |
|---|---|---|
| Glass width | 24 inches | Add planned side overlap |
| Side overlap | 1 1/4 inches each side | Finished width becomes 26 1/2 inches |
| Glass height | 36 inches | Add top and bottom coverage |
| Vertical overlap | 1 1/2 inches top and bottom | Finished height becomes 39 inches |
| Flat mounting width | 27 inches available | 26 1/2-inch blind fits with 1/4 inch total margin |
Outside-mount coverage should block light and preserve privacy without covering functional hardware. A shade over an emergency-exit window must not prevent the latch from operating, and a shade on a slide-out wall must not interfere with the slide mechanism.
Should you add or subtract from an inside-mount measurement?
Do not independently subtract a standard amount from an inside-mount measurement unless the seller explicitly instructs you to do so. Many custom blind companies make the deduction themselves, while some RV replacement systems require the customer to submit the exact opening or finished blind size.
Ask one precise ordering question: “Should I enter the exact opening measurement, or the finished blind measurement?” The answer differs by product. Subtracting twice can create excessive light gaps, while failing to subtract when required can make the blind too wide.
Step 6: Check RV Doors, Exit Windows, and Special Openings
Door and emergency-exit windows require movement clearance in addition to ordinary width and height measurements. Measure the closed-door position, the open-door position, the handle path, and the distance to the main entry or screen door.
For a door-mounted blind, identify whether the blind attaches to the door itself or to the surrounding wall. A wall-mounted shade may look correct when the door is closed but collide with the door edge when it opens.
Use this special-opening worksheet:
| Opening | Additional measurement | Typical failure |
|---|---|---|
| Entry door | Handle projection and door swing | Shade hits handle or frame |
| Screen door | Gap to main door | Headrail prevents closure |
| Emergency exit | Latch travel and release path | Shade blocks evacuation hardware |
| Crank window | Handle arc and spindle projection | Shade sits diagonally |
| Slide-out window | Slide trim and wall return | Outside mount catches trim |
Do not choose a product solely because its finished width matches the glass. A low-profile cordless shade can work where a deep cassette cannot, while a tension-guided pleated shade may require anchor locations that a thin door has no room to support.
Step 7: Record, Verify, and Submit the Order
Record each opening on a separate line using width first and height second, with the mount type beside the dimensions. Include the location, product type, color, control position, and any required deduction or finished-size instruction.
A reliable order record looks like this:
Location: Rear bedroom, driver side
Mount: Inside
Opening: 24 3/8 inches W x 36 inches H
Depth: 1 7/8 inches
Obstructions: Right-side latch, 3/4-inch projection
Existing hardware: Two bottom tension anchors
Order instruction: Exact opening dimensions, manufacturer to deduct
Verify each measurement once with the tape and once from the written record. Check that every width and height is in inches, that fractions are readable, and that no window location has been duplicated.
What measurement accuracy should you use?
Measure to the nearest 1/8 inch for custom RV blinds unless the manufacturer requests millimeters or a decimal measurement. A 1/4-inch reading can be adequate for some outside mounts, but tight inside mounts and replacement cassettes benefit from the finer increment.
Do not convert 24 3/8 inches into 24.3 inches. Decimal inches and fractional inches are different values, and confusing them can produce a significant ordering error.
RV Blind Types and Their Measurement Requirements
Pleated, roller, mini, and cellular blinds require different clearance checks even when they cover the same window. Product choice should follow the measured depth, obstruction pattern, cleaning needs, insulation goal, and required tension hardware.
| Type | Typical depth | Best use | Limitation |
|---|---|---|---|
| Pleated day/night | 1-1 1/2 inches | Shallow valances and dual privacy | Fabric pleats collect dust |
| Roller, including slow-rise | 1 3/4-2 1/2 inches | Blackout and simple cleaning | Larger cassette profile |
| Aluminum mini blind | 1-2 inches | Low-cost directional light control | Slats can rattle or bend |
| Cellular or honeycomb | 2-3 inches | Thermal control and soft light | More depth and higher cost |
Pleated day/night shades usually need accurate bottom-anchor placement because the tension cords keep the shade stable while the vehicle moves. Roller shades can offer cleaner operation, but their roll diameter and cassette require more front-to-back space.
Aluminum mini blinds are inexpensive and easy to replace, yet they need hold-down brackets or equivalent stabilization in moving vehicles. Cellular shades can reduce radiant heat transfer through the window, but their fabric and deeper stack may be unsuitable for damp locations or narrow valances.
No shade type is best for every RV. A deep cellular shade is a poor choice for a shallow door, and a light-filtering pleated shade is a poor choice for a sleeper who needs daytime blackout.
How Much Do Replacement RV Blinds Cost?
Typical replacement pricing ranges from $25-$50 for basic aluminum mini blinds to $80-$180 for roller shades, excluding unusual installation hardware and labor. A complete multi-window replacement commonly costs several hundred dollars, with the final amount determined by dimensions, fabric, cassette, control system, and shipping.
| Project size | Typical product total | Typical DIY time | Main cost driver |
|---|---|---|---|
| One mini blind | $25-$50 | 15-30 minutes | Slat size and hardware |
| One pleated shade | $40-$90 | 20-40 minutes | Day/night fabric and tension kit |
| One roller shade | $80-$180 | 30-60 minutes | Blackout fabric and cassette |
| One cellular shade | $60-$130 | 30-60 minutes | Cell size and side guides |
| Six-window mixed replacement | $300-$900 | 3-6 hours | Custom dimensions and shipping |
Treat these figures as typical retail planning ranges rather than quotations. Measure first, then compare the manufacturer’s finished-size policy, shipping charges, replacement warranty, and hardware availability.
Common Measuring Mistakes and Their Fixes
The most expensive errors come from using the wrong reference surface, applying the wrong deduction, or ignoring hardware movement. Each problem has a practical recovery method before the order is submitted.
Measuring the old blind instead of the opening
An old shade may have stretched fabric, damaged rails, or a factory error. Re-measure the opening and compare it with the old headrail only after identifying whether the old dimension is fabric width or finished outside width.
Using the widest width for an inside mount
A tapered valance can be wider at the bottom than at the bracket level. Use the smallest clear width, especially at the top, and confirm that the headrail can enter the cavity without compressing fabric or trim.
Forgetting the window crank
A crank can project into the shade path and force the blind outward. Measure the crank’s full operating arc, then select a shallow product, use spacers, or change to an outside mount if the manufacturer permits it.
Measuring glass instead of the mounting surface
Glass size describes the viewing area, not necessarily the blind size. Inside mounts require the recess dimensions, while outside mounts require the intended coverage area plus usable bracket space.
Ordering deductions twice
Some companies deduct automatically; others expect the customer to enter a finished size. Confirm the policy in writing and label your worksheet “opening size” or “finished blind size.”
Ignoring diagonal differences
If the two diagonals differ noticeably, the opening is out of square. A blind may bind even when the width readings appear acceptable, so use a smaller finished width, surface-mount the product, or correct the trim first.
How Do You Fix RV Blind Tension Problems?
An RV blind that will not stay raised, pulls unevenly, or binds usually has unequal guide-cord tension, misaligned hardware, or a worn internal mechanism. Check that the headrail is level and both lower anchors sit at matching heights before adjusting or replacing tension components.
A shade that drops under its own weight may have insufficient tension or a worn clutch. A shade that is difficult to lower may have excessive tension or misaligned guides. Adjust only according to the product instructions because some systems use crimped or sealed components that are not intended for field repair.
| Symptom | Likely cause | First corrective action |
|---|---|---|
| Shade will not stay up | Weak clutch or loose tension | Inspect guides and manufacturer adjustment |
| Shade is hard to lower | Excessive tension or crooked rail | Level rail and reduce tension if permitted |
| One side binds | Unequal cord length | Compare anchor heights and cord tension |
| Shade rattles during travel | Missing hold-down hardware | Replace anchors or clips |
| Fabric rolls crookedly | Unlevel brackets or uneven mounting | Re-level brackets before replacing fabric |
Never remove a bottom anchor from an exit window without checking whether it is part of the intended restraint system. For a broken spring, frayed cord, or damaged cassette, replacement may be safer than improvised repair.
Which RV Blind Should You Choose After Measuring?
Choose the shallowest product that meets the privacy, light-control, insulation, and safety requirements of the specific opening. Measurement determines what fits; operating conditions determine what remains practical after installation.
- Boondocking and extreme temperatures: Cellular shades can provide better insulating performance than thin aluminum slats, provided the valance has enough depth and the fabric can remain dry.
- Children and pets: Cordless roller or cordless cellular designs eliminate dangling operating cords, but confirm that the bottom rail and anchors tolerate vehicle movement.
- Lowest replacement cost: Aluminum mini blinds usually cost the least, although hold-down clips and slat damage can increase long-term maintenance.
- Blackout sleeping areas: Blackout roller shades generally block more light than light-filtering pleated fabric, but the cassette requires additional depth.
- Full-time RV use: Select a repairable system with available guides, brackets, and replacement fabric rather than judging only by the initial price.
RV blinds are not household blinds with shorter dimensions. Household products may lack bottom anchors, tension guides, vibration-resistant hardware, or a headrail profile suited to a valance.
RV Blind Measurement FAQ
Do all windows in the same RV use the same blind size?
No. Measure every window separately, even when two windows look identical. Manufacturing tolerances, trim thickness, wall curvature, and valance construction can create different usable openings, particularly between opposing sides of the RV.
Should RV blind measurements include the valance?
Include the valance when the blind mounts inside it or depends on its cavity for clearance. Measure the actual bracket surface and interior opening, not the outer decorative width of the padded fabric.
How much overlap should an outside-mount RV blind have?
A common starting point is 1-1 1/2 inches per side and 1-1 1/2 inches above and below, but the product instructions control. Reduce overlap where handles, latches, neighboring trim, or emergency hardware limit the mounting surface.
Can RV blinds be cut to fit after ordering?
Some aluminum blinds can be shortened or narrowed with suitable tools, but custom pleated, roller, cellular, and tension-guided systems often cannot be safely resized. Treat the submitted dimensions as final unless the manufacturer expressly offers alteration.
Is the blind size the same as the fabric size?
Usually not. A listed blind width may describe the finished outside width, headrail width, cassette width, or fabric width. Ask the seller which dimension the ordering form uses before entering an opening measurement.
What should you do when an RV window is not square?
Measure the opening at several points, identify the narrowest usable path, and check the diagonals. If the difference prevents smooth operation, use an outside mount or correct the trim instead of forcing an inside-mount shade into a distorted cavity.
The Bottom Line
How are RV blinds measured? Identify the mount, inspect every obstruction, measure width at three points and height at three points, verify depth, and record the result as width x height to the nearest 1/8 inch. Use the smallest inside width and largest inside height, but follow the chosen manufacturer’s deduction rules rather than guessing.
The most reliable replacement order includes the window location, mount type, opening dimensions, depth, crank or latch clearance, tension-anchor position, and the manufacturer’s finished-size instruction. Those details prevent the common failures: a headrail that cannot enter the valance, a door shade that collides with the handle, or a blind that fits the glass but cannot operate in a moving RV.