From this site

One project, every trade

Each calculator adds its lines to a single estimate — consolidated BOM, schedule and cash-flow included.

Open My Project →

Concrete Slab + Rebar Combined Mass Calculator

Compute the total combined mass of a reinforced concrete slab — concrete plus its rebar grid — in one result.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
13.12 ft9.84 ft0.49 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Total combined mass

9730.62 lb

Check your inputs

General-purpose slab reinforcement guideline, not a structural engineering design — load-bearing slabs should follow an engineer's specification.

Concrete volume
2.35 yd³
Concrete mass
9523.97 lb
Rebar linear length (incl. lap splice)
309.38 ft
Rebar mass
206.65 lb

At the values currently entered, the total combined mass works out to 4414 kg. The largest intermediate quantity is concrete mass, at 4320 kg — check that step first if the total looks off. Confidence is moderate: the method is sound, but real materials and site conditions vary. Figures are shown for United States, where IRC 2024 is the governing residential reference; switch the market above if you are building elsewhere.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Concrete mass uses a typical normal-weight density of 2,400 kg/m³; rebar mass uses standard ASTM A615 linear density coefficients (#3 = 0.56 kg/m, #4 = 0.994 kg/m, #5 = 1.552 kg/m)
  • A 15% lap-splice allowance is applied to total rebar linear footage, matching the site's Rebar Calculator

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why combine concrete and rebar mass into one number?
Total mass matters for logistics — crane lift capacity, truck load limits, and structural dead-load calculations all need the combined weight, not just the concrete volume.
Does this include formwork or other materials?
No — this is concrete plus rebar mass only. See the Concrete Formwork Calculator for form board estimates.
What if I use a different rebar size?
Choose the closest of the three offered sizes for a reasonable estimate, or use the standalone Rebar Weight Calculator for other bar sizes.