Concrete Weight Calculator: Find Weight in Pounds, Tons & Kilograms for Any Pour
Knowing how much your concrete pour weighs is not just a matter of curiosity. It is a critical piece of information for structural planning, truck load management, foundation bearing capacity, floor load calculations, and safe handling of precast elements. Whether you are a homeowner checking if your existing floor can support a new slab, a contractor verifying truck payload limits, or a structural engineer calculating dead loads, accurate concrete weight data is essential.
This concrete weight calculator converts your project's volume directly into weight in pounds, US tons, metric tons, and kilograms. It supports all common concrete mix types normal weight, lightweight, and heavyweight and all standard pour shapes including slabs, columns, footings, and walls. Results also include a per-square-foot surface weight for structural load reference.
Use this tool any time you need to know the total mass of a concrete structure, verify a truck's payload capacity, estimate haul-away tonnage for removal projects, or check whether your subfloor, trailer, or foundation can safely carry a planned concrete element.
What Is a Concrete Weight Calculator?
A concrete weight calculator is a conversion tool that takes the volume of a concrete pour expressed in cubic yards, cubic feet, or cubic meters and converts it into total weight using the known density of the concrete mix type. Weight is expressed in:
- Pounds (lbs): standard US unit for construction load calculations
- US tons (short tons): used for truck payload, haul-away, and demolition estimates (1 ton = 2,000 lbs)
- Metric tons (tonnes): used in international engineering specifications (1 tonne = 2,205 lbs)
- Kilograms (kg): the SI unit for mass, used globally in structural engineering
The calculator also outputs weight per square foot of slab surface, which is directly applicable to floor load and structural bearing capacity assessments. This per-square-foot figure is the dead load contribution of the concrete slab to the structure below it.
Why Concrete Weight Matters
Concrete weight is relevant across a surprisingly wide range of practical scenarios. Understanding the total mass of your pour is important for:
Structural Load Calculations
Every floor, deck, foundation, and slab must be designed to carry its own weight plus any live loads applied to it. The self-weight of the concrete is called the dead load and is the first input in any structural calculation. A 4-inch residential floor slab weighs approximately 50 lbs per square foot. A 6-inch commercial slab weighs approximately 75 lbs per square foot. These loads must be accounted for in beam sizing, column design, and foundation bearing capacity.
Truck Payload and Delivery Planning
Ready-mix concrete trucks have payload limits. A fully loaded standard mixer typically carries 8 to 10 cubic yards, which weighs 32,400 to 40,500 lbs. Knowing the weight of your order helps verify that the delivery truck is within legal road weight limits, especially for deliveries over soft ground, bridges, or restricted access routes.
Concrete Removal and Haul-Away
When demolishing and removing an existing slab, the weight determines disposal costs. Most concrete demolition contractors charge by the ton for haul-away. A 500 square foot driveway at 4 inches thick weighs approximately 9.3 tons that is the tonnage your disposal quote should reflect.
Precast and Structural Element Handling
Precast concrete panels, retaining wall blocks, steps, and pavers all have specific weights that determine what equipment is needed to place them safely. A standard 8x8x16 inch concrete block weighs about 38 lbs. A precast concrete step weighs 300 to 600 lbs. Knowing these weights prevents equipment underspecification and jobsite injuries.
Concrete Density: Weight per Unit Volume
The weight of concrete depends entirely on its mix design. Different concrete types have significantly different densities based on the aggregate used in the mix.
| Concrete Type | lbs per ft³ | lbs per yd³ | kg per m³ | Common Applications |
|---|---|---|---|---|
| Normal weight (standard) | 145 – 150 lb/ft³ | 3,915 – 4,050 lb/yd³ | 2,320 – 2,400 kg/m³ | Slabs, footings, walls, driveways |
| Lightweight concrete | 90 – 115 lb/ft³ | 2,430 – 3,105 lb/yd³ | 1,440 – 1,840 kg/m³ | Upper-floor slabs, topping slabs |
| Heavyweight concrete | 200 – 250 lb/ft³ | 5,400 – 6,750 lb/yd³ | 3,200 – 4,000 kg/m³ | Radiation shielding, counterweights |
| Reinforced concrete (rebar) | 150 – 155 lb/ft³ | 4,050 – 4,185 lb/yd³ | 2,400 – 2,480 kg/m³ | Structural slabs, beams, columns |
| Pervious concrete | 100 – 125 lb/ft³ | 2,700 – 3,375 lb/yd³ | 1,600 – 2,000 kg/m³ | Permeable driveways, parking lots |
| Aerated / foam concrete | 25 – 50 lb/ft³ | 675 – 1,350 lb/yd³ | 400 – 800 kg/m³ | Insulating fills, non-structural |
| Wet / freshly poured | ~150 lb/ft³ | ~4,050 lb/yd³ | ~2,400 kg/m³ | Same as hardened for practical purposes |
Concrete Weight Formula
// Basic Weight Formula
Weight (lbs) = Volume (ft³) x Density (lbs/ft³)
Weight (lbs) = Volume (yd³) x 4,050 (for standard concrete)
Weight (kg) = Volume (m³) x 2,400 (for standard concrete)
Weight per Square Foot (Surface Load)
// Weight/sq ft (lbs) = Thickness (ft) x Density (lbs/ft³)
4-inch slab: 0.333 ft x 150 lb/ft³ = 50 lbs/sq ft
6-inch slab: 0.500 ft x 150 lb/ft³ = 75 lbs/sq ft
8-inch slab: 0.667 ft x 150 lb/ft³ = 100 lbs/sq ft
Unit Conversions
- 1 cubic yard = 27 cubic feet
- 1 cubic yard of concrete ≈ 4,050 lbs ≈ 2.025 US tons ≈ 1.837 metric tons
- 1 cubic foot of concrete ≈ 150 lbs ≈ 0.075 US tons ≈ 68 kg
- 1 cubic meter of concrete ≈ 2,400 kg ≈ 2.4 metric tons ≈ 5,291 lbs
Real-World Concrete Weight Examples
Example 1: Residential Patio Slab 12 x 16 ft, 4 inches thick
| Step | Calculation | Result |
|---|---|---|
| Convert thickness | 4 in / 12 | 0.333 ft |
| Volume in ft³ | 12 x 16 x 0.333 | 63.94 ft³ |
| Volume in yd³ | 63.94 / 27 | 2.37 yd³ |
| Weight in lbs | 63.94 x 150 | 9,591 lbs |
| Weight in US tons | 9,591 / 2,000 | 4.80 tons |
| Weight in kg | 9,591 / 2.205 | 4,349 kg |
| Surface load | 0.333 x 150 | 50 lbs/sq ft |
Example 2: Residential Driveway 12 x 50 ft, 6 inches thick
| Step | Calculation | Result |
|---|---|---|
| Convert thickness | 6 in / 12 | 0.500 ft |
| Volume in ft³ | 12 x 50 x 0.500 | 300.00 ft³ |
| Volume in yd³ | 300.00 / 27 | 11.11 yd³ |
| Weight in lbs | 300.00 x 150 | 45,000 lbs |
| Weight in US tons | 45,000 / 2,000 | 22.50 tons |
| Weight in metric tons | 45,000 / 2,205 | 20.41 tonnes |
| Surface load | 0.500 x 150 | 75 lbs/sq ft |
Example 3: Concrete Column 14-inch diameter, 10 ft tall
| Step | Calculation | Result |
|---|---|---|
| Convert diameter | 14 in / 12 | 1.167 ft |
| Radius | 1.167 / 2 | 0.583 ft |
| Volume in ft³ | 3.14159 x (0.583)² x 10 | 10.68 ft³ |
| Weight in lbs | 10.68 x 150 | 1,602 lbs |
| Weight in US tons | 1,602 / 2,000 | 0.80 tons |
| Weight in kg | 1,602 / 2.205 | 727 kg |
Example 4: Concrete Removal 500 sq ft Driveway, 4 inches thick
| Step | Calculation | Result |
|---|---|---|
| Volume in ft³ | 500 x 0.333 | 166.50 ft³ |
| Weight in lbs | 166.50 x 150 | 24,975 lbs |
| Weight in US tons | 24,975 / 2,000 | 12.49 tons |
| Haul-away cost (est.) | 12.49 tons x $80/ton | ~$999 |
| Dumpster loads | At 10 tons capacity | 2 dumpster loads |
Concrete Weight Quick Reference Charts
Slab Weight by Size (4-Inch Thickness)
| Slab Dimensions | Volume (ft³) | Weight (lbs) | Weight (tons) | Load (lbs/sq ft) |
|---|---|---|---|---|
| 8 x 8 ft | 21.33 ft³ | 3,200 lbs | 1.60 tons | 50 lbs/sq ft |
| 10 x 10 ft | 33.33 ft³ | 5,000 lbs | 2.50 tons | 50 lbs/sq ft |
| 10 x 20 ft | 66.67 ft³ | 10,000 lbs | 5.00 tons | 50 lbs/sq ft |
| 12 x 12 ft | 48.00 ft³ | 7,200 lbs | 3.60 tons | 50 lbs/sq ft |
| 12 x 20 ft | 80.00 ft³ | 12,000 lbs | 6.00 tons | 50 lbs/sq ft |
| 16 x 20 ft | 106.67 ft³ | 16,000 lbs | 8.00 tons | 50 lbs/sq ft |
| 20 x 20 ft | 133.33 ft³ | 20,000 lbs | 10.00 tons | 50 lbs/sq ft |
| 20 x 30 ft | 200.00 ft³ | 30,000 lbs | 15.00 tons | 50 lbs/sq ft |
| 24 x 24 ft | 192.00 ft³ | 28,800 lbs | 14.40 tons | 50 lbs/sq ft |
| 30 x 40 ft | 400.00 ft³ | 60,000 lbs | 30.00 tons | 50 lbs/sq ft |
Slab Weight by Size (6-Inch Thickness)
| Slab Dimensions | Volume (ft³) | Weight (lbs) | Weight (tons) | Load (lbs/sq ft) |
|---|---|---|---|---|
| 10 x 10 ft | 50.00 ft³ | 7,500 lbs | 3.75 tons | 75 lbs/sq ft |
| 12 x 20 ft | 120.00 ft³ | 18,000 lbs | 9.00 tons | 75 lbs/sq ft |
| 16 x 20 ft | 160.00 ft³ | 24,000 lbs | 12.00 tons | 75 lbs/sq ft |
| 20 x 20 ft | 200.00 ft³ | 30,000 lbs | 15.00 tons | 75 lbs/sq ft |
| 20 x 40 ft | 400.00 ft³ | 60,000 lbs | 30.00 tons | 75 lbs/sq ft |
| 24 x 40 ft | 480.00 ft³ | 72,000 lbs | 36.00 tons | 75 lbs/sq ft |
| 30 x 40 ft | 600.00 ft³ | 90,000 lbs | 45.00 tons | 75 lbs/sq ft |
Weight per Cubic Yard by Mix Type
| Concrete Mix Type | lbs/yd³ | tons/yd³ | kg/m³ |
|---|---|---|---|
| Normal weight (standard) | 4,050 lbs | 2.025 tons | 2,400 kg/m³ |
| Normal weight (reinforced) | 4,185 lbs | 2.093 tons | 2,480 kg/m³ |
| Lightweight (structural) | 2,835 lbs | 1.418 tons | 1,680 kg/m³ |
| Lightweight (non-structural) | 2,160 lbs | 1.080 tons | 1,280 kg/m³ |
| Heavyweight (shielding) | 6,075 lbs | 3.038 tons | 3,600 kg/m³ |
| Pervious concrete | 3,105 lbs | 1.553 tons | 1,840 kg/m³ |
| Aerated / foam concrete | 1,013 lbs | 0.507 tons | 600 kg/m³ |
Weight of Concrete by Slab Thickness
| Slab Thickness | Weight per Square Foot | Weight per Square Meter | Structural Classification |
|---|---|---|---|
| 2 inches (5 cm) | 25 lbs/sq ft | 122 kg/m² | Topping slab, overlay |
| 3 inches (7.5 cm) | 37.5 lbs/sq ft | 183 kg/m² | Light-duty interior slab |
| 4 inches (10 cm) | 50 lbs/sq ft | 244 kg/m² | Standard residential slab |
| 5 inches (12.5 cm) | 62.5 lbs/sq ft | 305 kg/m² | Heavy residential / light commercial |
| 6 inches (15 cm) | 75 lbs/sq ft | 366 kg/m² | Standard commercial, driveways |
| 8 inches (20 cm) | 100 lbs/sq ft | 488 kg/m² | Structural / foundation slab |
| 10 inches (25 cm) | 125 lbs/sq ft | 610 kg/m² | Heavy structural slab |
| 12 inches (30 cm) | 150 lbs/sq ft | 732 kg/m² | Foundation wall / industrial pad |
Ready-Mix Concrete Truck Weight Guide
Understanding how much a concrete delivery truck weighs loaded and unloaded is critical for site access planning, especially on soft ground, private driveways, or restricted bridges.
| Truck Type | Empty Weight | Full Load Weight | Concrete Capacity | Legal Road Limit |
|---|---|---|---|---|
| Standard rear-discharge mixer | 26,000 – 30,000 lbs | 58,000 – 70,000 lbs | 8 – 10 yd³ | 80,000 lbs GVW |
| Front-discharge mixer | 28,000 – 32,000 lbs | 60,000 – 72,000 lbs | 9 – 10 yd³ | 80,000 lbs GVW |
| Mini mixer (short load) | 14,000 – 18,000 lbs | 28,000 – 36,000 lbs | 2 – 4 yd³ | 80,000 lbs GVW |
| Volumetric mixer | 30,000 – 38,000 lbs | 62,000 – 80,000 lbs | Variable | 80,000 lbs GVW |
Weight of Common Concrete Products and Elements
| Concrete Product | Dimensions | Weight |
|---|---|---|
| Standard concrete block (CMU) | 8 x 8 x 16 in | ~38 lbs |
| Lightweight CMU block | 8 x 8 x 16 in | ~28 lbs |
| 4-inch solid brick | 2.25 x 3.75 x 8 in | ~4.5 lbs |
| 12 x 12 in concrete paver (2 in) | 12 x 12 x 2 in | ~14 lbs |
| Precast concrete step (36-in wide) | 36 x 12 x 7 in | ~300 – 400 lbs |
| Precast retaining wall block (large) | 28 x 18 x 12 in | ~80 – 140 lbs |
| Precast concrete curb section (10 ft) | 10 ft x 6 x 8 in | ~900 lbs |
| Concrete Jersey barrier (20 ft) | 20 ft standard | ~8,000 lbs |
| 6-in concrete pipe (per ft) | 6-in diameter | ~30 lbs/lf |
| 12-in concrete pipe (per ft) | 12-in diameter | ~100 lbs/lf |
| Concrete manhole ring (24-in dia) | 24-in ID standard | ~1,200 lbs |
| Precast concrete panel (8 x 4 ft, 4 in) | 8 x 4 ft x 4 in | ~2,400 lbs |
Concrete Weight as Structural Dead Load
In structural engineering, the weight of the concrete slab itself is the primary dead load component that must be supported by the beams, joists, columns, and foundations beneath it. Use these values as a reference for preliminary structural assessments.
| Slab Type | Thickness | Dead Load (lbs/sq ft) | Dead Load (kPa) | Typical Use |
|---|---|---|---|---|
| Lightweight topping slab | 2 in | 18 – 23 lbs/sq ft | 0.86 – 1.10 kPa | Over structural decks |
| Thin residential slab | 3 in | 28 – 38 lbs/sq ft | 1.34 – 1.82 kPa | Interior non-structural |
| Standard residential slab | 4 in | 50 lbs/sq ft | 2.39 kPa | Ground floor, patio |
| Heavy residential slab | 5 in | 63 lbs/sq ft | 3.02 kPa | Garage, driveway |
| Standard commercial slab | 6 in | 75 lbs/sq ft | 3.59 kPa | Commercial floor, drive |
| Structural slab | 8 in | 100 lbs/sq ft | 4.79 kPa | Parking garage, industrial |
| Heavy structural slab | 10 in | 125 lbs/sq ft | 5.99 kPa | Transfer slabs, foundations |
| Foundation slab | 12 in | 150 lbs/sq ft | 7.18 kPa | Mat foundations, walls |
Wet vs. Hardened Concrete Weight
A common question is whether freshly poured (wet) concrete weighs more or less than hardened concrete. The practical answer for most projects is that the difference is negligible for planning purposes.
| State | Approx. Density | Notes |
|---|---|---|
| Freshly mixed (wet) | ~150 lbs/ft³ | Slightly heavier due to free water not yet evaporated |
| Fully hardened (28 days) | ~145 – 150 lbs/ft³ | Minor weight loss as excess water evaporates |
| Difference | ~2 – 5 lbs/ft³ | Less than 3% — negligible for construction planning |
| Saturated (water-logged) | ~155 lbs/ft³ | Concrete in contact with groundwater absorbs moisture |
Concrete Weight Unit Conversion Reference
| From | To | Multiply by | Example |
|---|---|---|---|
| Pounds (lbs) | US tons (short) | / 2,000 | 4,050 lbs / 2,000 = 2.025 tons |
| Pounds (lbs) | Metric tons (t) | / 2,205 | 4,050 lbs / 2,205 = 1.837 t |
| Pounds (lbs) | Kilograms (kg) | / 2.205 | 4,050 lbs / 2.205 = 1,837 kg |
| US tons | Pounds (lbs) | x 2,000 | 2.025 tons x 2,000 = 4,050 lbs |
| Metric tons (t) | Kilograms (kg) | x 1,000 | 2.4 t x 1,000 = 2,400 kg |
| Kilograms (kg) | Pounds (lbs) | x 2.205 | 1,837 kg x 2.205 = 4,050 lbs |
| lbs per ft³ | kg per m³ | x 16.018 | 150 lb/ft³ x 16.018 = 2,403 kg/m³ |
| kg per m³ | lbs per ft³ | / 16.018 | 2,400 kg/m³ / 16.018 = 149.8 lb/ft³ |
Common Concrete Weight Calculation Mistakes
- Using the wrong density value: Lightweight concrete weighs 90 to 115 lbs per cubic foot. Using the standard 150 lbs per cubic foot figure for a lightweight mix overestimates the weight by 30 to 60%. Always identify your mix type before selecting a density.
- Confusing cubic feet and cubic yards: Volume must be in cubic feet before multiplying by lbs per cubic foot, or in cubic yards before multiplying by lbs per cubic yard (4,050). Mixing units produces wildly incorrect results.
- Confusing US tons and metric tons: A US short ton is 2,000 lbs. A metric ton (tonne) is 2,205 lbs. The difference is about 10%, which matters in structural and logistics calculations. Always specify which ton you are using.
- Not accounting for reinforcement weight: Rebar adds approximately 5 lbs per cubic foot to the concrete weight. For heavily reinforced structural slabs, this adds up to 5 to 10 lbs per square foot of additional dead load.
- Forgetting water adds weight to fresh concrete: A cubic yard of concrete contains approximately 250 to 350 lbs of water. This weight is included in the standard density figure and does not need to be added separately.
- Underestimating truck access weight impact: A fully loaded concrete truck weighs 60,000 to 70,000 lbs. Assuming a standard residential driveway can support this without checking load ratings can result in driveway cracking or collapse.
Pro Tips for Concrete Weight Planning
- For demolition projects, calculate the weight of the existing slab before scheduling removal. This prevents undersizing dumpsters and haul-away equipment, which leads to extra trips and higher costs.
- When pouring near an existing structure, always verify that the structure's foundation can carry the additional dead load of the new concrete. A 20x20 ft patio at 4 inches adds 20,000 lbs of dead load to whatever is supporting it.
- For projects requiring a concrete pump, the weight of the concrete in the pump hose must be factored into the pump truck's outrigger load calculation. This is a safety-critical step that pump operators must perform on every job.
- When using ready-mix concrete on soft or saturated ground, ask your supplier about a mini mixer option. Smaller trucks weigh significantly less and reduce the risk of ground damage during delivery.
- For upper-floor pours, verify the floor's structural capacity before ordering. A standard wood-frame floor is typically designed for 40 to 50 lbs per square foot live load plus 10 to 15 lbs dead load — far less than the 50 to 75 lbs per square foot a concrete topping adds.
- Include rebar weight in your total pour weight estimate for structural calculations. Use 490 lbs per cubic foot for steel density and calculate rebar volume from your layout drawings for precise dead load values.
- Always verify local bridge and road weight limits before routing concrete delivery trucks. Overloaded trucks damage infrastructure and the contractor or homeowner can be held liable for the repair costs.
Frequently Asked Questions (FAQs)
Final Summary
Calculating concrete weight accurately is essential for structural load planning, delivery logistics, and demolition cost estimation. Here is your complete quick reference:
- Standard concrete density: 150 lbs per cubic foot / 4,050 lbs per cubic yard / 2,400 kg per cubic meter
- Formula: Volume (ft³) x 150 = Weight in pounds
- Convert to US tons: divide pounds by 2,000
- Convert to metric tons: divide pounds by 2,205
- Surface load: 50 lbs/sq ft at 4 in / 75 lbs/sq ft at 6 in / 100 lbs/sq ft at 8 in
- Lightweight concrete: 90 to 115 lbs per cubic foot
- Heavyweight concrete: 200 to 250 lbs per cubic foot
- A fully loaded concrete truck weighs 58,000 to 70,000 lbs
- Rebar adds approximately 5 lbs per cubic foot to reinforced concrete weight
- Wet and hardened concrete weigh virtually the same for planning purposes
Use the concrete weight calculator above to find the exact weight of any pour in seconds. Enter your dimensions, select your mix type, and get weight in pounds, tons, and kilograms instantly along with the per-square-foot surface load for structural reference.