Steel Calculator
Rebar weight is length x quantity x the CRSI unit weight for that bar size. A #5 bar weighs 1.043 lb per foot. Fifty #5 bars at 20 ft each, plus 5% wastage, weigh 1,095 lb (497 kg).
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Formula
- Total length = Bar length x quantity x (1 + wastage%)
- Weight in pounds = Total length x unit weight (lb/ft)
- Weight in kilograms = Pounds x 0.4536
Worked Example
| Input | Value |
|---|---|
| Bar size | #5 |
| Unit weight | 1.043 lb/ft |
| Length | 20 ft |
| Quantity | 50 bars |
| Wastage | 5% |
| Total length | 1,050 ft |
| Weight | 1,095 lb |
| Metric | 497 kg |
Frequently Asked Questions
What does a #5 rebar weigh per foot?
1.043 pounds per foot. The full CRSI set is #3 0.376, #4 0.668, #5 1.043, #6 1.502, #7 2.044 and #8 2.670 lb/ft.
What diameter is #4 rebar?
Number four rebar is four eighths of an inch, or 0.5 inch, in diameter. The bar number is the diameter in eighths of an inch.
How much rebar wastage should I allow?
Five percent covers normal cutting and lapping. Increase to eight percent for heavily detailed work.
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Estimates only. Quantities follow recognised standards (ACI 318, CRSI, IRC 2021, IS-1077, PBQS); actual site consumption varies with workmanship, wastage and detailing. Confirm with a licensed engineer before ordering.