You divided a 20×20 driveway by twelve inches and left the yard with thirty-something sticks. The far edge still needed the last bar. The chairs were already set. Someone drove back while the mixer idled. That is the second-run tax every short mat charges.
This is the rebar takeoff calculator you use on the job tomorrow, not theory. Not a structural design tool. Slab size, spacing, cover, bar count both ways, linear feet, 20 ft sticks, weight — or wire mesh sheets when the job is mesh instead of bar.
Free does one slab: rebar or mesh. Pro is $9.99 a month for extra slabs, mesh+rebar in one job, lap allowance, print-friendly takeoff, and waste-as-dollars. Worth $9.99 if the week has more than one pour or you need a list you can hand to a helper. After the first mat, the next app in the suite was already open: Concrete Mix Master for the same pour’s bags and yards.
What a rebar calculator actually has to do
Most “rebar calculator” pages are desk forms: enter dimensions, get a number, close the tab. A review that matters has to survive the next morning — dirty thumbs, a pickup list, a stick count the yard understands.
Rebar Takeoff Master is a phone-first PWA. Add it to the Home Screen. English UI. Feet/inches or metric. Offline after the first load. No login. Data stays on the device. You enter the slab, spacing, and cover. You get bars each way, linear feet, stock sticks, and weight for common bar sizes. Switch to mesh when the schedule calls for sheets (including common 8×20 and A142-style takeoffs) instead of forcing a bar grid onto a mesh job.
That is the product. Not ACI design software. Not a bar-bending schedule for a commercial tower. I used it on the job the next morning. If the count only works at a desk, it is homework. If it works in the truck before you buy the short load, it is a takeoff.
Free vs Pro — no mystery
| Feature | Free | Pro ($9.99/mo) |
|---|---|---|
| Slabs / zones | One slab | Extra slabs in one job |
| Mode | Rebar or mesh | Mesh + rebar together |
| Grid math (bars, LF, sticks, weight) | Yes | Yes |
| Lap allowance | — | Yes |
| Print-friendly takeoff | — | Yes |
| Waste as dollars | — | Yes (your unit price) |
Free is enough for one mat or one mesh field and a clean stick count. Pro is for a driveway plus a patio on the same morning, mixing mesh and bar, printing the list for a helper, or pricing the waste before you leave the yard. That is the $9.99 line.
There is no branded customer quote PDF here the way Fence Quote Pro has one. Rebar Takeoff Master Pro is about the steel list you can act on, not letterhead.
The mistake everyone makes
Forgetting the +1. Dividing clear span by spacing counts gaps, not bars. Drop the last edge bar and the mat looks fine until you count chairs against the form. The second mistake is ordering net linear feet with no waste — offcuts and laps eat 5–15%, and one bad cut turns into a hole while the truck is already on site.
Rebar Takeoff Master applies the floor-plus-one grid with cover. You still own the schedule on the drawing, the lap class, and the waste you add. Measure twice. A spare stick beats a cold joint waiting on steel.
What it is not
Estimate only — not engineering or building-code advice. It will not stamp a drawing, check development length for every splice class, or replace a structural engineer on a load-bearing slab. It will not invent chairs, dowels, or hooks that are not in your inputs.
It is not a full estimating suite. No client portal, no inventory cloud, no invoice. One English UI. Price in USD. Paying markets: USA, UK, Australia, New Zealand, Canada. No AI. The math is on-device.
Is $9.99 worth it?
If you pour one simple pad a month and a single mat covers it, Free is the product. Punch the slab. Read the stick count. Buy the steel.
If the week stacks two pours, mixes mesh and bar, or you need a print-friendly takeoff for a helper, Pro is the product. One short trailer run costs more than a month of Pro. Worth $9.99 on that week. Not worth pretending it replaces a stamped schedule. No fake star widget. No invented “customers say.” The test is whether you used it on the job the next morning. I did — then Concrete Mix Master was already open for the same pour’s volume.
The series
Rebar Takeoff Master is one app in EBN Build Calculators. After the mat, the next number is usually yards of concrete — or fence posts and studs on a different morning. Same idea across the suite: phone-first, offline, estimate only.
For the long-form chart, see how much rebar you need for a slab (20×20 at #4 @ 12 in ≈ 40 bars / ~43 sticks). Theory is the chart. The job is the takeoff on your phone.
Bottom line
Rebar Takeoff Master is a rebar calculator you can use at the yard tomorrow. Not a textbook. Not structural software. Free for one slab of rebar or mesh. Pro for extra slabs, mesh+rebar, lap, print, and waste-as-dollars at $9.99 a month. Punch the mat. Take the stick count to the counter. Open the next app in the series when the pour needs bags and yards.
Open Rebar Takeoff MasterEstimate only — not engineering or building-code advice. Not a stamped schedule. Not a contract.