Concrete & construction
Rebar Cost Calculator
Works reinforcement cost, where laps and the schedule drive the quantity.
Result
A planning estimate, not a quote. Access, the age of the equipment, what is found once it is opened up and local labour rates all move the real figure, sometimes a long way.
Get a Free Business AuditHow the calculation works
Bar length required, which includes lap splices where bars join, times the weight per foot for the bar size, times the price per unit weight. Laps add a meaningful amount to the total length, and the lap length required is a code figure depending on bar size, concrete strength and position.
What moves the number
- Bar size and spacing from the reinforcement schedule.
- Lap splice lengths where bars join.
- Bends, hooks and corner bars.
- Chairs and tie wire.
Where this one goes wrong
Laps are where a reinforcement takeoff falls short, because every joint between bars needs an overlap of a code-specified length and on a large slab or a long wall those overlaps total a substantial additional quantity. Include them. Chairs and tie wire are the other omission, and without chairs the steel ends up on the subgrade rather than at its specified position, which removes most of its benefit.
Before you quote
- Include lap splice lengths at every joint.
- Order chairs and tie wire with the steel.
- Take bar sizes and spacing from the reinforcement schedule.
Where the rules come from
Questions
About this calculator
Why is my rebar order short?
Laps, usually. Every joint between bars needs an overlap of a code-specified length, and on a large slab or long wall those overlaps total a substantial additional quantity that a straight length calculation misses.
What is a lap length?
The overlap required where two bars join so the force transfers between them, specified by the code according to bar size, concrete strength and position. It is a requirement rather than a convention, and an inspection will check it.
Do I need chairs?
Yes, otherwise the steel ends up on the subgrade rather than at its specified position, which removes most of its structural benefit. Reinforcement in the wrong place within the slab is close to no reinforcement at all.
The formula
total = hours x people x rate + parts + call-out, then sales tax
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How to use this calculator
- Hours on site (h). Enter your own figure; the page starts at 22 h.
- People needed. Enter your own figure; the page starts at 1.
- Labour rate charged ($). Enter your own figure; the page starts at $88.
- Parts and materials ($). Enter your own figure; the page starts at $2,400.
- Call-out or diagnostic fee ($). Enter your own figure; the page starts at $95.
- Sales tax (%). Leave at zero if you are quoting before tax.
The result updates as you type, so you can try a figure, see what it does to estimated total, and change it back. Nothing you enter is sent anywhere or saved.
A worked example
These are the figures the calculator opens with. Every number in the results column below is produced by the same calculation the page runs, so you can follow it through before putting your own figures in.
What goes in
| Input | Value |
|---|---|
| Hours on site | 22 h |
| People needed | 1 |
| Labour rate charged | $88 |
| Parts and materials | $2,400 |
| Call-out or diagnostic fee | $95 |
| Sales tax | 0% |
What comes out
| Result | Value |
|---|---|
| Estimated total main result | $4,431 |
| Labour | $1,936 |
| Before tax | $4,431 |
| Sales tax | $0 |
About $4,431: $1,936 of labour, $2,400 of parts and a $95 call-out.
How sensitive the answer is
Holding everything else steady and changing only labour rate charged, this is what happens to estimated total. It is worth knowing which of your inputs the answer actually hinges on, and which barely move it.
| Labour rate charged ($) | Estimated total |
|---|---|
| $44 | $3,463 |
| $66 | $3,947 |
| $88 example above | $4,431 |
| $132 | $5,399 |
| $176 | $6,367 |
Every other input is held at the example value while this one changes, which is not how a real job behaves. Treat it as a guide to which number matters most, not as five separate quotes.
What each figure means
- Hours on site (h)
- Measured in h, between 0 and 400, starting at 22 h.
- People needed
- A number, between 0 and 40, starting at 1.
- Labour rate charged ($)
- A money amount, starting at $88.
- Parts and materials ($)
- A money amount, starting at $2,400.
- Call-out or diagnostic fee ($)
- A money amount, starting at $95.
- Sales tax (%)
- Leave at zero if you are quoting before tax.
What the results tell you
| Result | What it is |
|---|---|
| Estimated total | The headline result. A money figure. |
| Labour | A money figure. |
| Before tax | A money figure. |
| Sales tax | A money figure. |
Order slightly more than this
Volume calculations assume a level, properly prepared base and exact dimensions. Sub-base variation, over-excavation and spillage all consume concrete, which is why most contractors add a margin. Running short mid-pour is far more expensive than a small overage.
Estimating is the easy part
The jobs you never hear about cost more than the ones you mis-measure. BDEVY builds the marketing, systems and automation that bring them in.