How Many Cubic Yards in a 5.5 Foot Truck Bed: Practical Guide

A 5.5-foot pickup truck bed usually holds about 1.3 to 1.5 cubic yards when loaded level with the bed rails. The exact amount depends on the bed’s inside length, width, wall height, wheel-well intrusion, and whether the material is level or heaped.

That estimate comes from converting the bed’s usable volume from cubic feet to cubic yards: divide cubic feet by 27. A typical short-bed pickup may measure close to 67 inches long, 63 inches wide across the upper bed, and 20 inches deep, but the usable floor width is narrower because of the wheel wells. The resulting level capacity often falls near 35 to 40 cubic feet, or approximately 1.3 to 1.5 cubic yards.

Are you deciding whether one load of mulch, topsoil, gravel, sand, or debris will fit without overloading the truck? This guide explains how to measure your specific bed, calculate level and heaped capacity, account for wheel wells and tailgate position, compare common materials, and recognize when volume is less important than payload weight. By the end, you can turn a supplier’s cubic-yard estimate into a realistic truck-bed plan and decide whether you need one load, several trips, or a larger delivery vehicle.

Table of Contents

What a 5.5-foot truck bed typically holds

A standard 5.5-foot bed generally holds between 1.25 and 1.5 cubic yards when material is spread level with the top of the bed. A carefully shaped load may appear to hold closer to 1.75 cubic yards, but that is a heaped estimate rather than the bed’s true enclosed volume.

The phrase “5.5-foot truck bed” identifies the nominal bed length, not the complete interior dimensions. Manufacturers often round the bed length to the nearest half-foot, while actual inside measurements vary by truck model, cab configuration, generation, bed liner, and tailgate design.

For a quick planning estimate, use these ranges:

Level load: about 1.25 to 1.5 cubic yards
Lightly heaped load: about 1.5 to 1.75 cubic yards
Very loose, tall heap: potentially more by volume, but often unsafe or above the truck’s payload rating

These figures describe volume only. A truck can have enough physical space for a cubic-yard load yet still be unable to carry its weight safely. Gravel, wet soil, sand, concrete, and demolition debris can reach the vehicle’s payload limit before the bed looks full.

Why the answer varies between different 5.5-foot beds

Two trucks advertised with a 5.5-foot bed can have noticeably different usable capacities. The nominal length is only one dimension, and the bed’s width and depth have an equally important effect on the final cubic-yard calculation.

Interior length is usually shorter than the advertised length

A “5.5-foot” bed refers to approximately 66 inches of nominal length, but the usable distance between the front wall and closed tailgate may be slightly shorter or longer. A thick bed liner, molded plastic coating, tie-down hardware, or an angled front wall can reduce the space available for material.

Measure the inside floor length rather than relying on the marketing description. If the tailgate is down, the added surface may support long objects, but it should not automatically be counted as enclosed cubic capacity. Loose material can spill, shift, or fall through the gap at the tailgate.

Wheel wells reduce the usable width

The bed may be roughly 60 to 65 inches wide near the upper walls but only 48 to 52 inches wide between the wheel wells. For loose material placed directly on the floor, the narrower dimension is usually the more realistic starting point.

Some beds have raised sections or storage pockets around the wheel wells, while others have a relatively flat floor. If material is shoveled into the bed, it can fill the spaces over and beside the wheel wells, but those raised sections still reduce the simple rectangular volume.

Bed depth is not always uniform

Truck beds commonly have a tapered shape, sloped sides, or a front wall that changes the interior height. The advertised bed depth may be measured at one location rather than representing the average depth across the entire floor.

Using the deepest point for every square inch will overstate capacity. A more reliable estimate uses the average usable depth, measured from the bed floor to the level where you intend to stop loading.

A bed liner can slightly reduce capacity

Spray-in and drop-in liners normally make only a small difference, but the reduction can matter when a calculation is close to the edge. A thick drop-in liner may take away an inch or more from some dimensions, and a raised liner floor can change how much material fits between the wheel wells.

How to calculate cubic yards from your actual truck-bed measurements

To calculate the capacity of a 5.5-foot truck bed, multiply the usable length, average usable width, and average loading depth in feet, then divide the result by 27. The formula is: length × width × depth ÷ 27 = cubic yards.

For the most useful result, take measurements in inches and convert the finished cubic-inch total to cubic yards, or convert each measurement to feet before multiplying. One cubic yard equals 27 cubic feet, or 46,656 cubic inches.

Use the floor width between the wheel wells for a conservative estimate

Suppose the usable floor length is 65 inches, the narrow width between wheel wells is 49 inches, and the average loading depth is 19 inches. The calculation is:

65 × 49 × 19 = 60,515 cubic inches

60,515 ÷ 46,656 = approximately 1.30 cubic yards

This conservative calculation treats the bed as a simple rectangular space between the wheel wells. It does not include the additional volume above the wheel wells or the wider space at the upper bed walls, so the actual level capacity may be somewhat higher.

Use an average width when the bed sides flare outward

If the bed is wider at the top than at the floor, measure the width at the floor and near the loading line. Add those two measurements and divide by two to estimate an average width.

For example, a bed might have a 50-inch floor width between the wheel wells and a 62-inch width near the top of the sides. The approximate average width is 56 inches. Using an average rather than the narrowest width gives a better estimate for material that fills the area above the wheel wells.

The calculation with a 65-inch length, 56-inch average width, and 19-inch depth would be:

65 × 56 × 19 = 69,160 cubic inches

69,160 ÷ 46,656 = approximately 1.48 cubic yards

That result illustrates why two reasonable calculations can produce answers near 1.3 and 1.5 cubic yards for the same general bed. One method is conservative and floor-based; the other reflects more of the bed’s upper volume.

Measure the loading height you will actually use

Do not measure from the floor to the highest point of the bed and then assume you will fill to that height. If the material must remain below the rails, use the distance from the floor to the chosen fill line.

For a safe road load, many people keep loose materials slightly below the bed rails and cover them with a tarp. The usable depth may therefore be 17 or 18 inches rather than the full 20 or 21 inches.

Example capacity calculations for common 5.5-foot beds

The following examples show why a range is more honest than one universal number. They are planning examples, not specifications for every truck.

Conservative floor-based calculation

Assume the usable floor measures 65 inches long by 50 inches wide, with 19 inches of loading depth:

65 × 50 × 19 = 61,750 cubic inches

61,750 ÷ 46,656 = approximately 1.32 cubic yards

This is a practical estimate for dense or wet material when you want to avoid counting the space above the wheel wells. It is also a useful number when the bed has pronounced wheel-well housings or when the load must remain low.

Average-width calculation for a level load

Assume the bed averages 56 inches in width after accounting for the wider upper sides, measures 65 inches long, and has 19 inches of usable depth:

65 × 56 × 19 = 69,160 cubic inches

69,160 ÷ 46,656 = approximately 1.48 cubic yards

This is a reasonable estimate for a level load of mulch, leaves, loose soil, or another material that settles into the available spaces. The amount may still be lower if the bed has a thick liner or unusually shaped walls.

Heaped-load calculation

A heap adds volume above the bed’s side rails, but the shape is not a rectangular box. A simple way to estimate it is to calculate the level capacity and then add approximately 10% to 25%, depending on the height and shape of the mound.

A 1.4-cubic-yard level load with a moderate heap might therefore contain roughly 1.55 to 1.75 cubic yards. This estimate is especially uncertain because a flat, broad heap and a tall, narrow mound can have very different volumes.

Heaping should not be used as a way to exceed the truck’s weight rating. A high pile also raises the center of gravity, increases the chance of material spilling, and may obstruct the driver’s rear visibility.

How level and heaped loads change the cubic-yard estimate

A level load reaches approximately the intended fill line across the entire bed. A heaped load rises above that line, so it contains more material but cannot be measured accurately by multiplying the full outside dimensions of the bed.

Suppliers often sell mulch, compost, topsoil, and similar products by the cubic yard based on a loose-volume measurement. Their “yard” may be loaded into a truck or trailer in a mound rather than distributed perfectly level. That makes a supplier’s stated quantity different from the truck’s enclosed level capacity.

Level loads are easier to compare

For planning, a level capacity of about 1.3 to 1.5 cubic yards is the clearest reference for most 5.5-foot beds. It provides a repeatable estimate and makes it easier to compare the truck with a delivery of one, two, or more cubic yards.

If buying exactly 1.5 cubic yards of lightweight mulch, a 5.5-foot bed may carry it if the material is distributed carefully and the truck’s payload allows it. If buying 1.5 cubic yards of wet soil or gravel, weight may make that load unsuitable even if it fits physically.

Heaped loads depend on material behavior

Mulch, shredded bark, leaves, and dry compost can form a tall pile, but they also settle during loading and transport. Sand and gravel tend to form a lower, more stable mound. Wet soil may clump instead of filling every corner, making volume estimates less predictable.

Do not assume that a visually full bed equals a measured cubic yard. Loose material can contain air spaces, and the amount of settling depends on moisture, particle size, handling, and travel distance.

How much mulch, soil, gravel, and sand fit in the bed

A 5.5-foot bed can often hold about 1.25 to 1.5 cubic yards of loose landscaping material level with the rails, but the safe amount depends heavily on density. Lightweight products are limited mainly by volume, while dense products are often limited by payload weight.

Material	Typical planning issue	Practical approach
Mulch	Usually volume-limited; may settle	Plan around 1.3–1.5 level cubic yards, subject to payload
Compost	Moisture changes weight and density	Confirm the supplier’s approximate weight per yard
Topsoil	Can become very heavy when wet	Use a conservative volume and check payload before loading
Sand	High density; commonly weight-limited	Do not assume the bed can carry a full physical volume
Gravel	Dense and concentrated in the bed	Verify weight; a partial load may be safest
Leaves and brush	Large air spaces and uneven compression	Estimate loosely and secure the load carefully

Material densities vary substantially. Dry mulch may weigh far less than a similar volume of saturated soil, and a load that seems modest by volume can exceed the truck’s payload rating when wet.

Mulch is usually the easiest material to carry by volume

Mulch is relatively lightweight, so a short-bed pickup may physically carry close to its level volume. However, mulch is often sold loose and delivered in a heap, and it can settle after loading.

Keep the pile below a height that allows a tarp to cover it securely. Fine mulch can blow out of the bed, creating a road hazard and reducing the amount that reaches the destination.

Topsoil and compost require a weight check

Topsoil and compost can vary from light and dry to dense and wet. A cubic-yard estimate from a landscape supplier may describe volume, but it does not guarantee that a particular pickup can safely carry that quantity.

Ask the supplier for an estimated load weight. Compare that figure with the truck’s available payload after accounting for passengers, fuel, tools, bed accessories, and any trailer tongue weight.

Gravel and sand can exceed payload before the bed is full

Gravel and sand are among the most important examples of the difference between volume and weight. A bed may have room for approximately 1.3 cubic yards, but a full load of dense aggregate can exceed the vehicle’s rated capacity.

For these materials, ordering a smaller quantity or using a landscape delivery truck is often more sensible. A commercial supplier can load according to the vehicle’s capacity rather than filling the bed based only on appearance.

How cubic yards relate to bags and smaller quantities

Bagged material is labeled in cubic feet rather than cubic yards, so divide the desired cubic yards by the volume of each bag to estimate the number required. One cubic yard equals 27 cubic feet.

For example, a 2-cubic-foot bag contains 2/27 of a cubic yard. Approximately 13.5 bags equal one cubic yard, although retailers sell whole bags, so the practical count is usually 14 bags per cubic yard.

For a 1.4-cubic-yard truck-bed estimate, the equivalent amount would be:

1.4 × 27 = 37.8 cubic feet

37.8 ÷ 2 = 18.9 bags

That is approximately 19 bags of 2-cubic-foot material. Bagged material usually contains less loose air than a rough heap, so the comparison is approximate rather than exact.

This conversion can help decide whether loading a pickup is worthwhile. If a project needs only a few bags, the bed’s capacity is irrelevant; if it needs nearly 20 large bags, the truck may be a practical alternative to multiple store trips.

How to measure a truck bed accurately before loading

Accurate measurement takes only a few minutes and is more reliable than using the truck’s advertised bed length. Measure the empty bed, account for the wheel wells, and decide whether the target is a level load below the rails or a higher heap.

Measure the usable length. Measure from the inside front wall to the inside of the closed tailgate. If the bed floor changes shape, take measurements at the center and both sides and use an average.
Measure the floor width. Record the narrowest distance between the wheel wells. Also measure the width near the top of the bed if the sides flare outward.
Measure the usable depth. Measure from the bed floor to the intended fill line, not necessarily to the top of the rails.
Estimate the average width. For a more realistic level-load calculation, average the floor width and upper loading width while recognizing that wheel-well shapes make the result approximate.
Convert the volume. Multiply length, width, and depth in feet, then divide by 27. If using inches, divide the cubic-inch result by 46,656.
Reduce the estimate for uncertainty. Subtract a modest amount if the bed has a thick liner, irregular walls, a sloped front, or material that will not settle evenly.

A tape measure, calculator, and the truck’s payload information are enough for most household projects. A supplier may also be able to estimate the weight of the exact material being purchased.

Why payload capacity matters more than cubic yards for heavy loads

Payload capacity is the maximum weight the truck is designed to carry in the cab and bed, including passengers and cargo. It is different from towing capacity and may be substantially lower than a casual estimate based on the truck’s size.

Find the vehicle’s actual payload information in the owner’s documentation, on the vehicle certification label, or from the manufacturer’s vehicle-specific information. Do not rely only on a generic model rating because options, four-wheel drive, cab style, engine, and equipment can change the available payload.

Subtract people and equipment from available payload

If a truck has 1,500 pounds of available payload and carries two adults, fuel, tools, a toolbox, and tie-down equipment totaling 450 pounds, only about 1,050 pounds remains for the material. The calculation must include everything added to the vehicle.

Bed caps, tonneau covers, racks, auxiliary tanks, and heavy liners also reduce available payload. A trailer attached to the truck may add tongue weight to the truck even when most of the load sits on the trailer.

Distribute the load across the bed

Place dense material low and as close to the axle area as practical rather than concentrating it at the tailgate. Uneven loading can affect handling, braking, suspension performance, and tire loading.

Do not exceed the tire load rating or axle ratings. Even when the total truck payload appears adequate, an overloaded rear axle or underinflated tire can create a serious safety problem.

Watch for signs that a load is too heavy

A truck that squats noticeably at the rear, bottoms out over normal bumps, feels unstable, or shows unusual steering and braking behavior may be overloaded or improperly distributed. These symptoms should not be treated as normal consequences of hauling material.

Rear suspension sits much lower than usual.
Tires appear excessively bulged or close to the wheel wells.
Steering feels light, vague, or difficult to control.
Braking distance or vehicle response changes noticeably.
Material shifts, spills, or pushes against the tailgate.

If the load is questionable, stop in a safe location and reassess it. Removing material is preferable to continuing with an unsafe load.

How to load and secure loose material safely

Load loose material below a securely supported tarp whenever possible, distribute it evenly, and keep the tailgate latched unless the truck’s design specifically supports another configuration. A tarp reduces wind loss but does not make an overweight or unstable load safe.

Use a shovel or loader carefully around the bed sides, wheel wells, and tailgate. Dropping dense material from excessive height can damage the bed floor, tailgate, or suspension components.

Keep the load contained

Fine materials can blow from an uncovered bed even at moderate road speeds. Use a properly sized tarp with working hooks or straps, and check that the cover remains tight after loading.

Do not let straps, tarp corners, or loose debris hang near the tires. Inspect the load again after driving a short distance, especially if the material settles.

Do not use the tailgate as an unsupported extension

A lowered tailgate can increase the surface area for lumber, brush, or other long items, but it does not necessarily increase the truck’s safe loose-material capacity. Material loaded on the tailgate may slide rearward, overload the tailgate hinges, or fall onto the road.

For long items, use appropriate supports and tie-downs. For dirt, gravel, mulch, and similar loose products, keep the load contained within the bed unless the truck is specifically equipped for a larger hauling configuration.

Common mistakes when estimating truck-bed capacity

The most common mistake is treating the advertised 5.5-foot length as if it were the only dimension needed. Capacity is three-dimensional, and the wheel wells, bed shape, loading height, and material behavior all affect the result.

Mistake: multiplying outside dimensions

Outside measurements include side walls, wheel-well structures, and spaces that are not usable for loose material. Use inside dimensions and an average width instead.

Mistake: counting a tall heap as level capacity

A pile above the rails may add volume, but it also changes stability and makes the amount difficult to measure. Separate the level estimate from the heaped estimate.

Mistake: assuming one cubic yard always weighs the same

A cubic yard is a unit of volume, not weight. The weight of one cubic yard changes with material type, moisture content, particle size, and compaction.

Mistake: ignoring settling

Loose mulch, soil, and compost can settle while being driven. A load that looks full at the supplier may arrive lower, while a tall loose heap may shift and spill.

Mistake: relying on a generic internet capacity number

Online estimates can help with initial planning, but the specific truck’s measurements and payload rating control the final decision. A bed liner, cab configuration, model year, or aftermarket equipment may change the result.

When a delivery truck is better than a pickup

A delivery truck is usually the better choice when the project requires several cubic yards, the material is especially dense, or the pickup’s payload is uncertain. Delivery also avoids repeated trips, loading work, and the risk of damaging a personal vehicle.

For a small amount of mulch or dry leaves, a 5.5-foot bed may be economical. For multiple yards of topsoil, sand, gravel, or wet compost, ask the supplier about delivery by a truck designed for that load.

Compare the total cost rather than only the material price. Several pickup trips may consume fuel, time, and labor, while a delivery fee may provide a safer and faster result.

Professional delivery is also useful when access is difficult. A supplier can often tell you whether the delivery vehicle needs a wide driveway, firm ground, overhead clearance, or a place to unload without damaging pavement or landscaping.

FAQ about how many cubic yards in a 5.5 foot truck bed

How many cubic yards in a 5.5 foot truck bed when loaded level?

A typical 5.5-foot truck bed holds about 1.25 to 1.5 cubic yards level. The exact capacity depends on interior dimensions, wheel-well width, bed depth, liner thickness, and the height used as the fill line.

Can a 5.5-foot truck bed hold 2 cubic yards?

Usually not as a safe, level load inside the bed walls. Two cubic yards may require a substantial heap above the rails, and dense materials could exceed the truck’s payload long before reaching that volume.

How many cubic yards of mulch fit in a 5.5-foot bed?

Approximately 1.3 to 1.5 cubic yards of mulch usually fit level, with somewhat more in a moderate heap. Keep the load covered and confirm that the mulch weight remains within the truck’s payload capacity.

Can a 5.5-foot bed carry one cubic yard of gravel?

It may have enough volume for one cubic yard, but the weight must be checked first. Gravel is dense, so verify the estimated load weight against the truck’s available payload, tire ratings, and axle limits.

Does a truck bed liner change the cubic-yard capacity?

Yes, a liner can slightly reduce usable capacity. A thick drop-in liner or raised bed floor takes away space and may narrow the usable width, although the difference is usually modest compared with the variation between truck models.

Does lowering the tailgate add cubic yards to the bed?

Not reliably for loose material. A lowered tailgate may support long, secured objects, but loose dirt, mulch, sand, or gravel can spill and may overload or damage the tailgate.

How do I convert cubic feet to cubic yards for a truck bed?

Divide the truck bed’s cubic-foot volume by 27. For example, 38 cubic feet divided by 27 equals approximately 1.41 cubic yards.

Is a heaped truck bed safe for every material?

No, a heap can be unsafe even when the material fits by volume. A high load can spill, block visibility, shift during braking, raise the center of gravity, or exceed the vehicle’s payload rating.

Use a measured estimate and verify weight before loading

A 5.5-foot pickup bed generally holds about 1.25 to 1.5 cubic yards of material in a level load, with a moderate heap potentially increasing the volume. Because bed dimensions and material densities vary, the most dependable answer comes from measuring the inside of the specific bed and calculating its usable space.

For mulch and other lightweight products, volume is usually the main concern. For soil, sand, gravel, and wet compost, check payload, axle, and tire limits before loading; a truck can run out of safe carrying capacity before the bed is full.

Measure the bed, convert cubic feet to cubic yards, ask the supplier for the material’s estimated weight, and use a tarp and balanced load for transport. If the amount or weight is close to the truck’s limits, order delivery or make smaller loads instead of relying on a tall heap.