Bar size × length × quantity — weight updates instantly
Calculate reinforcement steel weight, total rebar length, steel tonnage, and reinforcement quantities using accurate contractor-grade rebar weight formulas. A fast steel rebar weight calculator for field takeoffs and supplier quotes.
Standard deformed bar weights for this reinforcement bar weight calculator.
| Size | Diameter | lb / ft | kg / m | Common Use |
|---|---|---|---|---|
| #3 | 3/8 in | 0.376 | 0.560 | Wire-grade light steel, small slabs |
| #4 | 1/2 in | 0.668 | 0.994 | Residential slabs, driveways |
| #5 | 5/8 in | 1.043 | 1.552 | Garages, footings |
| #6 | 3/4 in | 1.502 | 2.235 | Structural slabs, grade beams |
| #7 | 7/8 in | 2.044 | 3.042 | Commercial foundations |
| #8 | 1 in | 2.670 | 3.973 | Columns, heavy mats |
| #9 | 1-1/8 in | 3.400 | 5.059 | Transfer beams, heavy footings |
| #10 | 1-1/4 in | 4.303 | 6.404 | High-load foundations |
| #11 | 1-3/8 in | 5.313 | 7.907 | Major structural elements |
Load a preset into this rebar lbs calculator—then adjust for your ticket.
40 pieces of #4 × 20 ft with 5% waste.
120 bars of #5 × 12 ft, 8% waste.
80 bars of #4 × 20 ft.
8 verticals of #6 × 10 ft, 5% waste.
Convert each bar to feet first. Total length equals bar length times quantity. Apply waste for cuts and scrap, then multiply by the standard weight per foot for the bar size. This is the core math behind every rebar tonnage calculator used in bidding.
For grid layouts, use our rebar calculator to count bars from slab dimensions, then enter total quantity here for a rebar calculator weight check before you call the steel yard.
Suppliers and estimators use published pounds-per-foot values by bar number. The weight is linear—double the length, double the steel. Quantity multiplies every stick in the bundle count. Nothing in this steel reinforcement weight calculator replaces a scale ticket, but field math should land within a few percent when your bar list is right.
Ready-mix is sold by the yard; rebar is often sold by the ton on commercial work. A 3,800 lb takeoff is 1.9 tons—round up if your cage has extra ties or you expect short drops. Compare tonnage to the concrete calculator volume on the same pour so material and labor stay in sync.
#4 and #5 dominate residential flatwork. #6 and up appear in structural slabs, grade beams, and columns. Match the engineer’s schedule—swapping #4 for #5 changes weight by roughly 56% per foot, not just diameter.
Measure or calculate bar count → set length per bar → add waste → convert to tons for quote → verify with spacing-based takeoff on slabs. For bid pricing, pair steel with the concrete cost calculator and slab volume tools.
At 0.668 lb/ft, 100 ft weighs about 66.8 lb before waste. With 5% waste, plan for roughly 70 lb.
Total pounds divided by 2,000. This tool does that automatically after you enter bar size, length, and count.
Hooks add length on each bar. Increase waste percent or add a few inches per bar mentally on heavy fabrication work.
Run each size separately and add the weights, or use the main rebar calculator for mixed schedules on large pours.
A slab rebar calculator builds quantity from dimensions and spacing. This page converts known bar lists into lb, kg, and tons.
U.S. crews order in pounds and tons; metric projects and some suppliers use kg. Showing both avoids manual conversion errors.