How to Create a Concrete Material Takeoff Step by Step

What Is a Concrete Material Takeoff?

A concrete material takeoff is a structured measurement of the concrete-related materials shown on, or required by, the project documents. Its main output is concrete volume in cubic yards, with separate quantities for items such as reinforcing steel and formwork.

A takeoff is not an estimate. The takeoff produces quantities, while the estimate multiplies those quantities by unit prices and adds labor, equipment and other costs.

The Federal Highway Administration defines an estimate as the predicted project cost developed from knowledge of the costs for materials, labor and equipment. Its PS&E guidelines also say estimates should list each item with its quantity, unit and price.

That guidance was written for highway work, but the logic carries over to any concrete job. Measure first, then price.

This guide covers a plan-driven takeoff with many elements. For a quick volume on one simple slab, the how to calculate concrete guide is faster. When your quantities are ready, price them with the Concrete Project Estimator or the Contractor Bid Calculator.

What Should Be Included in a Concrete Takeoff?

The scope depends on the project. A small slab may need only ready-mix volume and a vapor retarder, while a reinforced foundation may need every item below.

• Ready-mix concrete in cubic yards, separated by mix designation
• Reinforcing steel in pounds or tons
• Welded wire reinforcement, where specified, in square feet or sheets
• Formwork in square feet of contact area
• Vapor retarder in square feet or rolls
• Joint material in linear feet
• Embeds, anchors and dowels by count
• Curing or surface treatments in square feet
• Pumping and placement items, noted for the estimate

Not every project requires every category. The drawings and specifications decide which ones apply, and each category keeps its own unit so unlike quantities are never added together.

What Drawings Do You Need Before Starting?

A reliable takeoff cannot come from a floor plan alone. FHWA describes plans as the contract drawings showing the locations, character and dimensions of the work, and specifications as the written requirements, including the method of measurement.

• Structural foundation plan and slab plan
• Sections and enlarged details
• Schedules for footings, columns, beams and reinforcement
• General notes
• Architectural plans, where dimensions must be coordinated
• Concrete specifications
• Addenda and revisions

A dimension that looks missing on the plan is often shown on a section or a standard detail. Search the whole set before assuming it does not exist.

If you are measuring an existing site instead of drawings, see how to measure concrete properly.

Set Up a Concrete Takeoff Sheet Before Measuring

Build the worksheet before you measure anything. A good sheet lets a second person trace every quantity back to the drawing without asking you what you meant.

Use these columns as your reusable framework:

• Item number and drawing or detail reference
• Concrete element and location
• Concrete class or mix
• Count, length, width and depth or thickness
• Gross volume and deductions
• Net yd³, allowance and order quantity
• Notes

Table 1 shows a condensed version of the sheet with two illustrative rows. These numbers are sample data, not project recommendations.

Table 1. Concrete takeoff worksheet template. Allowance and order columns stay pending until net quantities are final.

Step 1: Confirm the Latest Drawing Revision

Before you measure, establish which drawing set is current. Check issue dates, revision clouds, addenda, sketch revisions and any conflicts between the structural and architectural sheets.

A serious estimating error is measuring the slab from Revision 3, the footing from Revision 2 and the wall detail from the original issue. FHWA treats the plans and specifications together as the documents that define the work to be built.

Step 2: Read the Structural General Notes

General notes often change a takeoff more than the plan view does. Read them fully before you record a single dimension.

• Concrete classes and specified strengths
• Slab thicknesses and footing requirements
• Reinforcement notes
• Exposure requirements
• Construction joint notes
• Special mix requirements

Do not assume the whole job uses one mixture. NRMCA notes that different mixtures are commonly used for different parts of a structure, and each mixture gets a designation that appears on the delivery ticket (NRMCA CIP 31).

That means quantities must be totaled by mix. For background on strength designations, see the Concrete PSI Guide.

Step 3: Identify Every Concrete Element

Create an element checklist before you calculate. Taking off one element at a time gives far better error checking than multiplying total building area by a guessed slab thickness.

• Slabs and slab thickenings
• Strip footings and isolated footings
• Foundation walls and retaining walls
• Grade beams
• Columns, piers and pedestals
• Equipment and housekeeping pads
• Stairs and landings
• Curbs and miscellaneous infill

Small items such as pads, curbs and stair landings are the ones most often forgotten. Work through every sheet with the checklist beside you.

Step 4: Mark Up the Plans by Element or Pour

Marking up the drawings keeps you from counting anything twice or skipping it. Two organization methods work well.

• By element type: all footings in one color, all walls in another, all slabs in a third.
• By placement or pour sequence: Footing Pour 1, Wall Pour 2, Slab Pour 3.

The second method takes more planning, but it later feeds directly into concrete ordering and truck scheduling.

The Basic Concrete Takeoff Formula

Cast-in-place concrete is estimated geometrically and sold by volume in cubic yards. One cubic yard equals 27 cubic feet (3 ft × 3 ft × 3 ft), so every dimension must be in feet before you multiply.

Check any conversion with the Concrete Cubic Yard Calculator, or look it up in the Concrete Volume Conversion Chart. Table 2 lists the geometry for each element type.

Table 2. Concrete volume formulas by element. Divide each ft³ result by 27 for cubic yards.

How to Calculate a Concrete Slab Takeoff

For a rectangular slab, convert the thickness to feet, multiply, and divide by 27. Take thickness from the drawings and notes, not from habit. The Concrete Slab Thickness Chart is a general reference, but your project documents control.

To verify a single slab quickly, use the Concrete Slab Calculator. For a general quick estimate, the Concrete Calculator also works.

How to Calculate Strip Footings

Strip footings run in continuous lines. Add up the length of each footing size separately, then multiply by its own width and depth.

• Separate footings of different sizes into different lines.
• Measure along the footing centerline so corners and intersections are not counted twice.
• Check stepped footings against the section at every elevation change.

For footing background, see the Concrete Footing Guide, and use the Concrete Footing Calculator to cross-check your numbers.

How to Calculate Isolated Footings and Pads

Isolated footings are counted by type, and the count multiplies the volume of a single footing.

Here N is the number of identical footings. Do not assume every footing is the same. Read the footing schedule and calculate each mark on its own line.

• F1: 4 × (5 × 5 × 1.5 ft) = 150 ft³ = 5.56 yd³
• F2: 6 × (3 × 3 × 1 ft) = 54 ft³ = 2.00 yd³
• F3: 2 × (4 × 4 × 1.25 ft) = 40 ft³ = 1.48 yd³

These sizes are illustrative, not design values. Together the three footing types total 9.04 yd³. Keeping each mark separate means one revised footing does not force you to redo the rest.

How to Calculate Foundation and Retaining Walls

Calculate each wall thickness separately. Take wall height from the sections and elevations, including any stem height above the footing.

Account for openings only when the estimating method or specification calls for it. Do not borrow a universal minimum opening size for deductions from another project.

Check your result with the Concrete Wall Calculator.

How to Calculate Grade Beams

A grade beam is its cross-sectional area multiplied by its length. For a rectangular grade beam, V equals L × W × D.

Watch for overlap with footings, pile caps, columns and slabs. Decide where one element ends and the next begins before you calculate anything.

For example, count the grade beam over its clear length between footings and count each footing in full at the intersection. Apply the same boundary rule everywhere so concrete is neither omitted nor counted twice.

How to Calculate Columns, Piers and Pedestals

Use a rectangular formula for square or rectangular columns and a circular formula for round piers. Divide the cubic feet by 27 in either case.

• Rectangular column, 1.5 ft × 1.5 ft × 10 ft: 22.5 ft³, or 0.83 yd³ each
• Round pier, 2 ft diameter (r = 1 ft) × 6 ft: π × 1² × 6 = 18.85 ft³, or 0.70 yd³ each

These sizes are illustrative. Place columns of different sizes on separate lines and multiply each by its count. The Concrete Column Calculator handles both shapes.

How to Calculate Concrete Stairs

There is no safe one-size stair formula, because waist slabs, landings and support geometry vary from design to design. Choose one of two approaches.

• Section-based: take the cross-sectional area of the stair profile from the section drawing and multiply by the stair width.
• Component-based: split the stair into measurable shapes, such as the landing as a slab and the flight as a prism, then add the volumes.

Confirm landing thickness and any thickened edges from the details. The Concrete Stairs Calculator gives a useful cross-check.

How to Handle Irregular Concrete Shapes

Break irregular geometry into simple pieces, calculate each one, and add the results. Useful building blocks include:

• Rectangles: L × W × thickness
• Triangles: ½ × base × height × thickness
• Trapezoids: ½ × (a + b) × height × thickness
• Circles: π × r² × thickness
• Repeated sections: one section volume × number of repeats

For highly irregular structures, you can use design-model or CAD quantities, but only after checking the source geometry against the drawings.

Table 3 pulls the earlier elements into one small illustrative project. It assumes the footing centerlines form a 30 ft × 40 ft rectangle, which gives 140 ft of footing.

Table 3. Worked whole-project example. Illustrative small structure, net theoretical volume only.

Gross Volume vs. Net Concrete Volume

Gross volume is the bounding geometry of an element. Net volume is what remains after approved deductions or adjustments, such as large openings, blockouts, voids and recesses.

The deduction question has no universal answer. Some public agency measurement methods intentionally do not deduct embedded items such as reinforcing steel or joint material, while other methods treat openings differently.

Follow the measurement provisions in your project specifications, apply one convention across the whole takeoff, and write that convention in the notes.

How to Avoid Double-Counting Concrete at Intersections

Double-counting happens wherever two elements meet. Define the boundary for each pair before you calculate.

• Wall over footing: count the footing to its top, and start the wall there.
• Column into footing: measure column height from the top of the footing.
• Grade beam crossing a footing: count the intersection once, using one consistent boundary.
• Slab over a grade beam or thickening: count the slab thickness once.
• Footing corners: measure along the centerline, not the outside edge.

Slab Thickenings, Turned-Down Edges and Depressions

For integral thickenings, calculate the base slab volume plus only the additional depth. Adding the full thick section on top of the full slab counts the base thickness twice.

Depressions work the same way in reverse. Measure the reduced thickness as a subtraction from the base slab and record it as its own line.

How to Take Off Reinforcing Steel

Concrete is measured in cubic yards, but reinforcing steel is measured by weight. FHWA lists a reinforcing bar list and bar bending diagram among the items that bridge plans should include, and CRSI publishes reference data on standard bar sizes, weights and hooks.

1. Identify the bar mark from the plans and schedules.
2. Record the bar size and the spacing or count.
3. Determine each cut length from the details.
4. Add laps, hooks and bends only as shown in the approved details.
5. Total the length for each bar size.
6. Convert to weight using the nominal weight per foot.

Do not invent lap lengths from rules of thumb. Take them from the structural details or the design.

If the drawings include a bar schedule, use it to speed up the takeoff. Then reconcile it with the current drawings and revisions before ordering, because a schedule can be outdated or approximate.

Helpful tools include the Rebar Calculator, the Rebar Weight Per Foot Calculator, the Rebar Size Chart, the Rebar Spacing Chart and the Concrete Cover Chart. If you are unsure whether a slab needs steel at all, read Does Concrete Need Rebar?

How to Take Off Welded Wire Reinforcement, Fibers and Dowels

These three items are quantified differently, so keep them on separate lines.

• Welded wire reinforcement: measured in square feet or sheets and rolls, based on the specified product and its required laps.
• Fibers: usually ordered as a dosage in the concrete mixture. Do not estimate them as an area unless the supplier or project documents give a dosage.
• Dowels: counted, with each dowel’s size and length taken from the details.

The Concrete Wire Mesh Calculator can help with mesh areas and sheet counts. Take lap requirements from the specification rather than from memory.

How to Calculate Formwork Area

Formwork is measured by contact surface area, not by concrete volume. It is also treated as its own construction system, which is why ACI publishes a dedicated guide to formwork for concrete.

• Wall, both faces formed: area = 2 × L × H. A 40 ft long, 8 ft high wall gives 2 × 40 × 8 = 640 ft².
• Footing with all four sides formed: area = 2 × (L + W) × D. A 5 ft × 5 ft × 1.5 ft footing gives 2 × (5 + 5) × 1.5 = 30 ft² each.
• Slab edge form: area = perimeter × thickness. A 140 ft perimeter at 5 in gives 140 × 5/12 = 58.3 ft².

Check the sections to see which faces are actually formed. Footings may have formed sides, earth-formed faces and no bottom form.

Contact area is the measured quantity. How many times forms are reused is a separate estimating decision.

Vapor Barriers, Joints, Anchors and Embedded Items

These materials are not part of the ready-mix quantity, and they are easy to miss. Quantify each one in the unit that fits it, as shown in Table 4.

Table 4. Concrete-related materials and takeoff units.

For vapor retarder details, read the Concrete Vapor Barrier Guide. For joint layouts, see concrete control joints.

For curing compound, use the manufacturer’s stated coverage with the Curing Compound Calculator. Never assume any of these items is included automatically in the ready-mix price.

How Much Extra Concrete Should You Add?

Takeoff quantity is the calculated geometry from the drawings. Order quantity is that figure plus an allowance for real placement conditions. NRMCA says the quantity ordered should be 4% to 10% more than an estimate calculated from plan dimensions, to account for contingencies (NRMCA CIP 31).

That is a range, not a fixed rule. Where you land in it depends on several job conditions.

• Excavation accuracy and subgrade variability
• Form accuracy and irregular geometry
• Placement losses
• Project size
• Your ability to measure the remaining quantity during placement

Calculate the net quantity first, then apply the allowance as its own visible step. Never fold a flat 10% into every element.

NRMCA also advises making a good estimate before ordering, re-evaluating the quantity needed to finish a placement, and avoiding excessive orders or small clean-up loads. The How Many Yards of Concrete Do I Need? guide covers the same idea for small jobs.

Convert the Takeoff Into Concrete Loads and Pour Quantities

Once the order quantity is set, divide it by the planned load size to estimate the number of loads.

NRMCA states that truck mixer capacity varies from about 8 to 12 cubic yards, so do not assume every truck carries exactly 10 yd³.

Using the 33.76 yd³ order from Table 3 and a 10 yd³ planned load gives about 3.4 loads. That could mean three full loads plus a partial load, and the supplier decides actual dispatch quantities.

The delivery ticket is your check on what arrives. NRMCA says the purchaser should verify the delivered mixture against its designation, then check and sign the ticket and note any special occurrences. See how to read a ready-mix concrete delivery ticket.

Related tools include the Ready Mix Truck Calculator and the Ready Mix Concrete Truck Load Chart. To price the order, see concrete cost per yard and concrete delivery cost.

How to Check a Concrete Takeoff for Errors

Run a structured check before you price or order. Indiana DOT’s quantity estimating chapter offers a good model: computation sheets are retained, and both the preparer and a checker sign or initial and date each one.

The same manual says not to round raw figures until they reach the quantity summary tables, and to round structural concrete to the nearest 0.1 yd³. That keeps small rounding errors from stacking up.

If the plans include a summary of quantities, compare your totals against it and investigate any difference. Table 5 lists the most common takeoff errors and how to prevent them.

Table 5. Top concrete takeoff errors.

After the takeoff is priced and the pour is finished, compare planned and actual cost with the Construction Job Cost Variance Calculator. Then run the final checklist in Table 6 before you place the order.

Table 6. Final takeoff QA checklist.

Concrete Material Takeoff FAQs