# How to Measure a Truck Bed for a Tonneau Cover (2026) > How to measure a truck bed for a tonneau cover: where to measure, how truck makers measure, nominal sizes vs real inches, and the options that change the… - Source: https://truckcoverguide.com/posts/how-to-measure-truck-bed-for-tonneau-cover/ - Markdown version: https://truckcoverguide.com/posts/how-to-measure-truck-bed-for-tonneau-cover.md - Last updated: 2026-11-12 --- - [Home](https://truckcoverguide.com/) - [Guides](https://truckcoverguide.com/guides/) - How to Measure Your Truck Bed for a Tonneau Cover (and Why Inches Lie) Fitment # How to Measure Your Truck Bed for a Tonneau Cover (and Why Inches Lie) Updated November 12, 2026 By [Truck Cover Guide Editorial Team](https://truckcoverguide.com/about/) [How we research](https://truckcoverguide.com/how-we-research/) Prices are approximate and change often, so check the current price before you buy. ## Key takeaways - Measure along the bed floor from the inside of the front bulkhead to the inside of the closed tailgate. - Covers are sold by nominal size: Ford's '5.5-ft' F-150 box measures 67.1 in, and most cover listings call it 5'7". - Truck makers measure differently: Ford, GM and Toyota publish inside length at the floor, Ram length at the floor with the tailgate closed. - Length alone doesn't pick the part. Model-year generation, RamBox, CarbonPro beds, multi-function tailgates and deck rails all change it. - Our [bed size finder](https://truckcoverguide.com/tools/bed-size-finder/) gives the maker's figure for 26 truck generations. ## Our top picks - 1![Gator ETX Soft Roll-Up Tonneau Cover](https://truckcoverguide.com/_astro/gator-etx-roll-up.Cm7pyct7_Z19vqXo.webp)Budget pick sold for most popular beds: about $220 for the F-150 and Ram 5'7"[Gator ETX Soft Roll-Up Tonneau Cover](https://truckcoverguide.com/tonneau-covers/gator-etx-roll-up/)Soft roll-up · Vinyl · 100% bed access · Locks with tailgate7.0**$**$$$BudgetPrice tier: Budget[Check price on Amazon](https://www.amazon.com/dp/B08WCHHYPB?tag=truckcoverguide.com-20) - 2![BAKFlip MX4 Hard Folding Tonneau Cover](https://truckcoverguide.com/_astro/bakflip-mx4.CoOqV3JL_1Hou5h.webp)Our best overall, with verified listings for 10 truck and bed fitments, from about $1,200[BAKFlip MX4 Hard Folding Tonneau Cover](https://truckcoverguide.com/tonneau-covers/bakflip-mx4/)Hard folding · Aluminum panels · 100% bed access · Locks with tailgate8.2**$$$**$PremiumPrice tier: Premium[Check price](https://www.amazon.com/dp/B08L44X6NZ?tag=truckcoverguide.com-20) - 3![Tyger Auto T3 Soft Tri-Fold Tonneau Cover](https://truckcoverguide.com/_astro/tyger-t3.CYc3CeVX_Z1HPxRC.webp)Budget tri-fold with fitments for the F-150, Ram, Tacoma and Ranger, about $250–$270[Tyger Auto T3 Soft Tri-Fold Tonneau Cover](https://truckcoverguide.com/tonneau-covers/tyger-t3/)Soft tri-fold · Vinyl · 100% bed access · Locks with tailgate7.0**$**$$$BudgetPrice tier: Budget[Check price](https://www.amazon.com/dp/B0B94WC2F1?tag=truckcoverguide.com-20) ### On this page 9 sections - [Where to measure](#where-to-measure) - [Nominal sizes vs real inches](#nominal-sizes-vs-real-inches) - [How each truck maker measures](#how-each-truck-maker-measures) - [Look up your truck instead](#look-up-your-truck-instead) - [What changes the part number besides length](#what-changes-the-part-number-besides-length) - [Heavy-duty, compact and other midsize trucks](#heavy-duty-compact-and-other-midsize-trucks) - [Bed size affects which cover type makes sense](#bed-size-affects-which-cover-type-makes-sense) - [Confirm before you buy](#confirm-before-you-buy) - [FAQ](#faq) ## Before you choose - [How to Install a Tonneau Cover: Tools, Steps and What Each Type Needs](https://truckcoverguide.com/posts/how-to-install-a-tonneau-cover/) - [The Best Tonneau Covers for the Ford F-150 (2021–2026): 7 Picks by Bed and Budget](https://truckcoverguide.com/posts/best-tonneau-cover-for-f150/) - [The Best Tonneau Covers for the Silverado and Sierra 1500 (2019–2026): 7 Picks](https://truckcoverguide.com/posts/best-tonneau-cover-for-silverado/) Every tonneau cover is built for one truck generation and one bed length, so the first job is knowing exactly which bed you have. That sounds simple until you notice that Ford calls a bed “5.5 ft,” the cover box says “5’7”,” and your tape measure says something else again. This guide explains where to measure, how each truck maker measures, and what else besides length decides which cover part fits. The bed lengths below come from the truck makers’ own spec sheets and brochures, the same data behind our [bed size finder](https://truckcoverguide.com/tools/bed-size-finder/). The cover sizes come from the Amazon listings we checked on November 12, 2026. ## Where to measure - **Close the tailgate.** Cover length is set by the closed tailgate, not the bed floor with the tailgate down. - **Measure along the floor**, from the inside face of the front bulkhead (the wall behind the cab) to the inside of the tailgate. Ford, GM and Toyota publish bed length this way: inside length at the floor. - **Measure in the middle**, not over a wheel well or a bed liner lip. A thick drop-in liner can shave a little off. - **Note your cab style** (crew, extended or regular) and the model year. You’ll need both. Then round to the nearest nominal size listed for your truck. Don’t expect your measurement to match a listing to the tenth of an inch. ## Nominal sizes vs real inches Covers are sold by nominal names that rarely match the truck maker’s wording, and different makers’ inches don’t quite agree either. Some common examples: | Truck | Maker’s name | Maker’s figure | How cover listings describe it | | --- | --- | --- | --- | | Ford F-150 2021+ SuperCrew | 5.5-ft box | 67.1 in | 5’7” (67.1”) | | Ford F-150 2021+ | 6.5-ft box | 78.9 in | 6’7” (78.9”) | | Ram 1500 2019+ Crew Cab | 5’7” box | 67.4 in | 5’7” (67.4”) | | Ram 1500 2019+ | 6’4” box | 76.3 in | 6’4” (76.3”) | | Silverado/Sierra 1500 2019+ Crew Cab | Short bed | 69.9 in | 5’10” (69.9”) | | Silverado/Sierra 1500 2014–2018 | Short bed | 69.3 in | 5’8” or 5’9” (69.3”) | | Toyota Tacoma 2024+ Double Cab | 5-ft bed | 60.3 in | 5’ (60”) | | Toyota Tacoma 2016–2023 Double Cab | 5-ft bed | 60.5 in | 5’1” (60.5”) | | Toyota Tundra 2022+ CrewMax | 5.5-ft short bed | 65.6 in | 5’7” (66.7”) | | Ford Ranger 2024+ SuperCrew | 4.97 ft | 59.6 in | 5’ (60”) | | Colorado/Canyon 2023+ Crew Cab | 5.1 ft (GMC) | about 61.2 in | 5’2” (62”) | The Tundra is a good example of why you shouldn’t chase decimals: Toyota’s 2025 brochure gives 65.6 in for the current CrewMax short bed, while cover listings for that truck still say 66.7 in, the figure Toyota published for the previous generation. Both describe the same nominal 5.5 ft bed, and the cover made for the 2022+ truck is the one that fits it. The Colorado and Canyon figure is our conversion of GMC’s “5.1 ft,” so it could be off by about half an inch. ## How each truck maker measures The bed size finder shows the basis for every truck, because the makers don’t all measure the same way: - **Ford:** “inside length (at floor)” for the F-150 and Super Duty; Maverick figures are bed length with the tailgate closed. - **Ram:** “length at floor, tailgate closed” for the 2019+ 1500, and simply “bed length” in some newer guides. - **GM:** “inside length of box at floor” for the Silverado; GMC’s brochures give rounded feet for some trucks. - **Toyota:** “inside bed length.” - **Honda** publishes the Ridgeline’s bed length with the tailgate up (64.0 in), and **Hyundai** the Santa Cruz’s at the floor (52.1 in). Covers for those two are sold by model rather than by length. Small differences between brands are normal and don’t mean your truck is unusual. ## Look up your truck instead Measuring is a good check, but the fastest route is to look up the maker’s figure: - 2021+ F-150 SuperCrew short box: [bed size finder for the F-150 5.5 ft](https://truckcoverguide.com/tools/bed-size-finder/#truck=ford-f150-2021&bed=supercrew-5.5) - 2019+ Ram 1500 Crew Cab 5’7”: [bed size finder for the Ram 1500](https://truckcoverguide.com/tools/bed-size-finder/#truck=ram-1500-2019&bed=crew-cab-5.7) - 2019+ Silverado 1500 Crew Cab short bed: [bed size finder for the Silverado](https://truckcoverguide.com/tools/bed-size-finder/#truck=chevrolet-silverado-1500-2019&bed=crew-cab-5.8) - 2024+ Tacoma Double Cab 5 ft: [bed size finder for the Tacoma](https://truckcoverguide.com/tools/bed-size-finder/#truck=toyota-tacoma-2024&bed=double-cab-5) - 2022+ Tundra CrewMax 5.5 ft: [bed size finder for the Tundra](https://truckcoverguide.com/tools/bed-size-finder/#truck=toyota-tundra-2022&bed=crewmax-5.5) Each result shows the maker’s figure, the nominal size covers use, and the cover listings we’ve verified for that truck and bed. ## What changes the part number besides length Two trucks with the same bed length can need different covers. Check these before you order: ### Generation Covers clamp to the bed rails, bulkhead and tailgate, and those shapes change between generations. Covers for the 2016–2023 Tacoma don’t fit the 2024+ truck; every line we checked for both generations sells separate parts. Many lines sell separate F-150 parts for 2015–2020 and 2021+, though some, like the [TruXedo Lo Pro](https://truckcoverguide.com/tonneau-covers/truxedo-lo-pro/) F-150 5’7” listing, cover both. ### Factory bed options - **Ram 1500:** RamBox side bins and the Multi-Function (split) tailgate each need their own versions. The [BAKFlip MX4](https://truckcoverguide.com/tonneau-covers/bakflip-mx4/) Ram 5’7” listing, for example, doesn’t fit the split tailgate. - **Silverado and Sierra:** the CarbonPro composite bed needs specific parts, and some covers note MultiPro/MultiFlex tailgate compatibility. - **Tacoma and Tundra:** the factory deck rail system and Trail Special Edition storage boxes change fitment. ### Your own accessories Over-the-rail bed liners, aftermarket bed rails and toolboxes can block the clamps. Tyger says owners with over-the-rail liners need to cut small holes for its [T3](https://truckcoverguide.com/tonneau-covers/tyger-t3/) clamps. ### Ram 1500 vs Ram 1500 Classic The Classic was sold alongside the new truck from 2019 to 2024 and takes different covers. Tyger’s T3 Ram listing, for instance, says it doesn’t fit the 2019–2024 Classic. ## Heavy-duty, compact and other midsize trucks The same rules apply beyond the half-tons. From the makers’ own documents in our finder: - **Ford Super Duty 2023+:** 6.75-ft box 81.9 in and 8-ft box 98.1 in, inside length at the floor. - **Ram 2500/3500 2019+:** 6’4” box (76.3 in) and 8’ box (98.3 in). - **Nissan Frontier 2022+ Crew Cab:** 5 ft (59.5 in) and 6 ft (73.3 in) pickup box cargo length. - **Jeep Gladiator 2020+:** 60.3 in with the tailgate closed. - **Ford Maverick 2022+:** 54.4 in with the tailgate closed, the shortest bed in our finder apart from the Santa Cruz. We left out trucks where we couldn’t find a maker figure, including the 2017–2022 Super Duty, the Nissan Titan and GM’s 2500HD/3500HD, rather than guess. ## Bed size affects which cover type makes sense Once you know the length, think about how much of it each cover leaves usable. A retractable’s canister takes roughly 7–14 in at the cab end depending on the brand, which is a bigger share of a 5 ft Tacoma bed than of an 8 ft F-150 bed. A standard tri-fold folds over the front third. Our [bed access calculator](https://truckcoverguide.com/tools/bed-access-calculator/) draws each type to scale for your bed. What each cover type leaves usable on a 5.5 ft bed Side view, cab on the left, 67.1 in bed floor (the 2021+ F-150 5.5 ft box). Open bed Covered by the opened cover (low cargo still fits under) Floor taken by a canister Soft roll-up Includes our estimate 88% 4 ft 11 in open-top Hard roll-up Includes our estimate 79% 4 ft 5 in open-top Soft tri-fold, folded From maker/retailer figures 67% 3 ft 9 in open-top Hard tri-fold, folded From maker/retailer figures 67% 3 ft 9 in open-top Hard fold, stood up Includes our estimate 91% 5 ft 1 in open-top Retractable From maker/retailer figures 80% 4 ft 6 in open-top Hinged one-piece From maker/retailer figures Low cargo only close to drive Run your own bed length in the [bed access calculator](https://truckcoverguide.com/tools/bed-access-calculator/). ## Confirm before you buy - Find your bed in the [bed size finder](https://truckcoverguide.com/tools/bed-size-finder/), or measure floor length with the tailgate closed. - Open the cover listing and use its fitment tool (Amazon’s “Confirm fit” or the maker’s vehicle selector) with your year, cab and bed. - Read the fitment line for exclusions: RamBox, split tailgate, CarbonPro, deck rails, storage boxes. - If you have an over-the-rail liner or bed rails, check the install notes. When you’ve got the right bed, see our picks for the [F-150](https://truckcoverguide.com/posts/best-tonneau-cover-for-f150/), [Ram 1500](https://truckcoverguide.com/posts/best-tonneau-cover-for-ram-1500/), [Silverado](https://truckcoverguide.com/posts/best-tonneau-cover-for-silverado/) and [Tacoma](https://truckcoverguide.com/posts/best-tonneau-cover-for-tacoma/), or the [install guide](https://truckcoverguide.com/posts/how-to-install-a-tonneau-cover/) for what comes next. ## Don't guess. Calculate. - [📏 Bed Size Finder](https://truckcoverguide.com/tools/bed-size-finder/): what bed length your truck has - [🎯 Cover Matcher](https://truckcoverguide.com/tools/cover-matcher/): which cover type suits you - [📐 Bed Access Calculator](https://truckcoverguide.com/tools/bed-access-calculator/): usable bed with the cover open - [📊 Compare every cover](https://truckcoverguide.com/tonneau-covers/): sortable spec table ## Frequently asked questions ### Where do you measure a truck bed for a tonneau cover? Along the bed floor, from the inside face of the front bulkhead to the inside of the closed tailgate. That's how Ford, GM and Toyota publish bed length (inside length at the floor). Then match the result to the nominal size listed for your truck generation. ### Is a 5.5 ft bed the same as 5'7"? On the F-150, yes. Ford calls it the 5.5-ft box and its spec sheet gives 67.1 in at the floor; most cover listings, such as BAK's and Gator's, call the same bed 5'7". Ram's 5'7" box is 67.4 in, and the 2022+ Tundra's 5.5 ft bed is 65.6 in by Toyota's figure. ### What size tonneau cover do I need for a Silverado short bed? For a 2019 or later Silverado or Sierra 1500 short bed, GM's figure is 69.9 in inside length at the floor. Cover listings call it 5'10", sometimes 5'8". The 2014–2018 short bed is 69.3 in and appears as 5'8" or 5'9". Buy the listing for your generation. ### Can I use a cover from a different generation if the length is the same? Usually not. Covers clamp to the bed rails, tailgate and bulkhead shapes, which change between generations. Covers for the 2016–2023 Tacoma don't fit the 2024+ truck, and many lines sell separate parts for the 2015–2020 and 2021+ F-150. ### What if my measurement falls between two sizes? Look up your truck's generation and cab in the bed size finder and use the maker's figure rather than your tape. Small differences of an inch are normal because makers measure at different points. If you're still unsure, check the cab: on most trucks only certain cab and bed combinations exist. ## Sources - [Ford: 2021 F-150 technical specifications (PDF)](https://www.fromtheroad.ford.com/content/dam/fordmediasite/us/en/library/2021/specs/2021-F-150-Technical-Specs.pdf) · checked 2026-11-12 — SuperCrew 5.5-ft box: 67.1 in inside length at floor; 6.5-ft box 78.9 in; 8-ft box 97.6 in. - [Ram: 2019 Ram 1500 eBrochure, cargo box dimensions (PDF)](https://www.ramtrucks.com/content/dam/fca-brands/na/ramtrucks/en_us/global/pdf/brochure/19MY%20Ram%201500%20DT%20eBrochure.pdf) · checked 2026-11-12 — 5'7" box 67.4 in and 6'4" box 76.3 in, length at floor with the tailgate closed. - [GM Upfitter: 2024 Silverado 1500 Crew Cab specification guide (PDF)](https://www.gmupfitter.com/wp-content/uploads/2023/10/2024-Silverado-SSV-Specification-Guide-V2-1.pdf) · checked 2026-11-12 — Short bed 69.9 in and standard bed 79.4 in inside length of box at floor. - [Toyota: 2024 Tacoma eBrochure, dimensions (PDF)](https://www.toyota.com/content/dam/toyota/brochures/pdf/2024/tacoma_ebrochure.pdf) · checked 2026-11-12 — 5-ft bed 60.3 in and 6-ft bed 73.5 in inside bed length. - [Toyota: 2025 Tundra eBrochure, dimensions (PDF)](https://www.toyota.com/content/dam/toyota/brochures/pdf/2025/tundra_ebrochure.pdf) · checked 2026-11-12 — CrewMax 5.5-ft short bed 65.6 in, 6.5-ft bed 77.6 in, 8.1-ft long bed 96.5 in inside bed length. ## Get new guides by e-mail One short e-mail when Truck Cover Guide publishes a new guide. No spam, no sharing your address, and you can unsubscribe in one click. E-mail address New posts only · Unsubscribe anytime · [Privacy](https://truckcoverguide.com/privacy/) Our #1 pick Budget pick sold for most popular beds: about $220 for the F-150 and Ram 5'7" ![Gator ETX Soft Roll-Up Tonneau Cover](https://truckcoverguide.com/_astro/gator-etx-roll-up.Cm7pyct7_19f8hC.webp) ### [Gator ETX Soft Roll-Up Tonneau Cover](https://truckcoverguide.com/tonneau-covers/gator-etx-roll-up/) 7.0 - Soft roll-up - Vinyl - 100% bed access Anyone who just wants the bed covered, out of sight and mostly dry for the least money. $$$$ Budget Price tier: Budget F-150 5.5 ft listing on Amazon [Check price on Amazon](https://www.amazon.com/dp/B08WCHHYPB?tag=truckcoverguide.com-20)[Read the full review](https://truckcoverguide.com/tonneau-covers/gator-etx-roll-up/) [📏 Which bed do you have? Make, model, year and cab in; bed length out, from the maker's spec sheet.](https://truckcoverguide.com/tools/bed-size-finder/)[🎯 Roll-up, fold or retractable? Match a cover type to your security, access and budget in 30 seconds.](https://truckcoverguide.com/tools/cover-matcher/) ## Keep reading [Install guide ### How to Install a Tonneau Cover: Tools, Steps and What Each Type Needs How to install a tonneau cover: the tools, the clamp-on steps most covers share, and what roll-ups, folders and retractables need, with real install times. Updated Nov 12, 2026](https://truckcoverguide.com/posts/how-to-install-a-tonneau-cover/)[Ford F-150 ### The Best Tonneau Covers for the Ford F-150 (2021–2026): 7 Picks by Bed and Budget The best tonneau covers for the 2021–2026 Ford F-150: BAKFlip MX4, Gator EFX, Revolver X4s, RetraxPRO MX and more, with part numbers and prices by bed. Updated Nov 12, 2026](https://truckcoverguide.com/posts/best-tonneau-cover-for-f150/)[Silverado & Sierra ### The Best Tonneau Covers for the Silverado and Sierra 1500 (2019–2026): 7 Picks The best tonneau covers for the 2019–2026 Silverado and Sierra 1500: BAKFlip MX4, Gator EFX, Lo Pro, RetraxPRO MX and more, with CarbonPro and MultiPro notes. Updated Nov 12, 2026](https://truckcoverguide.com/posts/best-tonneau-cover-for-silverado/) Budget pick sold for most popular beds: about $220 for the F-150 and Ram 5'7" Gator Soft Roll-Up $$$$ Budget Price tier: Budget [Check price](https://www.amazon.com/dp/B08WCHHYPB?tag=truckcoverguide.com-20)