Rebar Weight Calculator — Pounds & Tons Per Slab
Convert total rebar linear feet into pounds and tons for any project. Includes CRSI weight per linear foot for #3 through #8 bars and total order weight.
Enter Dimensions
Add 10% for standard cuts and overlaps
Results
Bars Needed
38bars
Total Lineal Feet
608lin ft
Total rebar length including waste
Total Weight
406lb
#4 rebar weight per CRSI
Slab Area
240sq ft
Editorial Standards
Each calculator is reviewed for formula accuracy, unit consistency, and alignment with current U.S. building practices before publication. We verify outputs against published engineering references and real-world project data. Learn more about our methodology.
Rebar pricing transitions from per-piece to per-pound at most suppliers around 500 lb. Knowing the total weight before placing the order tells you which pricing tier applies and how to plan delivery (a pickup truck holds ~1 ton of rebar bundles safely).
This calculator converts total linear feet of rebar — from the parent Rebar Calculator's slab grid output — into pounds and tons, using the ASTM A615 standard weight-per-foot for each bar size.
How to Calculate Rebar Weight
Total weight (lb) = Total Linear Feet × (lb/ft for bar size). Tons = Pounds ÷ 2000.
ASTM A615 Rebar Weight Reference
- #3 (3/8″ dia): 0.376 lb/ft — 7.52 lb per 20 ft stick
- #4 (1/2″ dia): 0.668 lb/ft — 13.36 lb per 20 ft stick
- #5 (5/8″ dia): 1.043 lb/ft — 20.86 lb per 20 ft stick
- #6 (3/4″ dia): 1.502 lb/ft — 30.04 lb per 20 ft stick
- #7 (7/8″ dia): 2.044 lb/ft — 40.88 lb per 20 ft stick
- #8 (1″ dia): 2.670 lb/ft — 53.40 lb per 20 ft stick
Frequently Asked Questions
How much does rebar weigh per foot?
#3 = 0.376 lb/ft, #4 = 0.668 lb/ft, #5 = 1.043 lb/ft, #6 = 1.502 lb/ft, #7 = 2.044 lb/ft, #8 = 2.670 lb/ft. These are ASTM A615 standard weights for plain or epoxy-coated bars.
Why does rebar weight matter for estimating?
Suppliers price rebar by the pound or per ton, especially for orders over ~500 lb. Knowing total weight lets you compare quotes accurately and plan transport (a ton of rebar fills a pickup bed).
How heavy is a 20 ft length of #4 rebar?
20 ft × 0.668 lb/ft = 13.36 lb. A 20-piece bundle (typical supplier package) of 20 ft #4 weighs ~267 lb.
Does epoxy-coated rebar weigh the same as black bar?
Effectively yes — the epoxy coating adds less than 1% to total weight and is generally ignored in take-offs. Galvanized rebar adds 2–3% but is still rounded to the standard weight per foot.
Should I order rebar by the piece or the ton?
Under 500 lb total: by the piece (standard 20 ft or 40 ft sticks). Over 500 lb: by the ton — bulk pricing is typically 15–25% cheaper per pound, though delivery is required.
Looking for the general calculator?
Calculate rebar quantity, spacing, and total weight for concrete slabs, footings, and walls. Covers #3 through #8 bar sizes using CRSI published weight tables.
Open the Rebar Calculator: Bar Count & Weight →