How-to
How to Measure Your Truck Bed for a Tonneau Cover
Take a tape measure and go along the bed floor, from the inside of the front wall to the inside of the closed tailgate. Write down the inches. Then compare with the inches in the cover's title, not the name of the bed.
The short version
Measure along the bed floor, from the inside of the front wall to the inside of the closed tailgate. Write down inches. Compare with the inches in the cover's title. Truck makers publish inside lengths like 67.1 inches, and titles round them in different ways, so ask the seller if your number sits between two listings.
What you need
A tape measure, a pen and one minute. Do this before you read any listing.
Close the tailgate
The cover seals against it, so this is the end point that counts.Clear the floor
Move cargo off one side so the tape lies flat.Measure along the floor
Run the tape from the inside of the front wall to the inside of the closed tailgate. Write down the inches.Note the extras
Write down an over-the-rail liner, deck rails, a track rail, a RamBox or a split tailgate.Compare with the title
Match your inches to the title. Ask the seller if your number sits between two listings.
Measuring along the floor is our own method, chosen to give a clear number to compare. A maker's sheet or seller may ask for something more specific. Follow them if they do.
Why the names do not help
A bed can go by three names and more. Here is what truck makers publish next to what titles say.
| Truck | Truck maker says | Titles say |
|---|---|---|
| F-150 short box | Ford: 5.5 ft box, 67.1 in inside (2021) | Tyger 5.5 ft (67 in), Gator 5 ft 7 in (67.2 in) |
| Tacoma short bed | Toyota: 5 ft, 60.5 in (2023) | Tyger 5 ft (60 in), Gator 5 ft 1 in |
| Tacoma long bed | Toyota: 6 ft, 73.7 in (2023) | Gator 6 ft 2 in (73.7 in), Tyger 6 ft (74 in) |
| Tundra short bed | Toyota: 5.5 ft, 65.6 in (2025) | Tyger 5.5 ft (66 in) and 5.5 ft (67 in) |
| Tundra standard bed | Toyota: 6.5 ft, 77.6 in (2025) | Tyger 6.5 ft (78 in) and 6.5 ft (79 in) |
So one bed can show up as 65.6, 66 and 67 inches depending on who is writing. That is why you read the inches as a clue, and do not treat one inch as proof of anything. If your number is close to the title, you are likely fine. If you are unsure, ask.
What your cab tells you
Cab helps you rule out beds. Ford's 2026 order guide lists a SuperCrew with a 5.5 or 6.5 ft box, a SuperCab with 6.5 ft and a Regular Cab with 6.5 or 8.0 ft. Toyota's 2025 Tundra list has a Double Cab with 6.5 or 8.1 ft, and a CrewMax with 5.5 or 6.5 ft. More in does cab size matter.
Extras that change the answer
- Over-the-rail bed liner. Tyger's sheets call for small 2 x 4 in holes cut for the clamps. See bed liners.
- Tacoma deck rails. See what stays and what comes off.
- RamBox or split tailgate. Some titles rule them out.
- CarbonPro bed. Several Silverado titles rule it out.
Common mistakes
- Measuring from the tailgate's outside edge rather than from the inside of it.
- Taking a nickname as a length. "Long bed" can mean two sizes, as Toyota's own 2026 brochure shows.
- Ordering because the title says your truck, when it does not name your bed.
Unsure about a word on a listing? The glossary explains it. Now go to your truck. The rest is a matter of matching what you wrote down.
What owners ask
Should I measure with the tailgate open or closed?
Closed. A cover seals against the closed tailgate. Measure to the inside of the closed tailgate, along the floor.
My measurement is between two listings. What now?
Ask the seller with your truck's year, cab and your measured inches. Do not guess. Sellers round in different ways, so a difference of an inch or so may be naming rather than a different bed.
Do I need to measure if I know my bed name?
Not always. If your title says your truck, your years and the same bed name, that should do. Measure when the names differ, as with 5.5 ft, 5 ft 7 in and 67 inches on an F-150.
Does a bed liner change the measurement?
It can. Measure to the bed walls, and note whether your liner goes over the rail. Tyger's sheet says over-the-rail liners need 2 x 4 in holes cut for the clamps, so the liner matters for install either way.
Sources
Where to next
- Truck fitAll trucksPick your truck, then your years and bed. Every roll-up tonneau cover listed here quotes the fit wording from its listing or the maker's own sheet.
- Question & answerDoes Cab Size Matter for a Roll-Up Cover?Not directly. Cover titles go by bed, not by cab. But your cab narrows which beds your truck can have. See Ford's and Toyota's lists and how to use them.
- How-toInstall a roll-up coverHow a soft roll-up tonneau cover goes on, from the Tyger and Gator sheets: tools, rail placement, clamps, crossbars, tension, and the checks most people skip.
- About usHow we verify fitFit here is what a listing title or a maker sheet states, marked as such. What we read, what blocked us, and why you still confirm year and bed before you buy.
Who is behind this
rolluptonneaucover.com Editorial Team
Truck fit and buying advice
We are the editorial team at rolluptonneaucover.com. We read listing titles, maker install sheets and truck makers' own bed specifications and sort them truck by truck, with sources on every page. Nobody here has bolted these covers to a truck, and nothing was measured in a lab. We say so plainly.
- Listing titles and maker sheets read
- Sources on every page
- No installs and no lab work
- Publisher details in the imprint