Concrete Calculator App: Know Exactly What You Need Before You Pour
Free concrete calculator app for iPhone. Get cubic yards, bag counts, and cost estimates for slabs, post holes, footings, and stairs.
Every concrete project starts with the same question: how much do I actually need?
Get it wrong and you're either making a second trip to the hardware store mid-pour, or stacking leftover bags in your garage for the next five years. We built Concrete Calculator & Cost Est to answer that question in under five seconds — for slabs, post holes, tubes, stairs, and footings.
It's free, it works offline, and it just launched on the App Store.
Why Another Concrete Calculator?
Dozens of concrete calculators exist online. Most of them are terrible.
They're buried under ads, they only handle one shape, and they give you cubic yards without telling you how many bags that actually is. You end up pulling out your phone's calculator app anyway to figure out how many 80lb bags fit in your truck.
We wanted something different:
- All project types in one app — slabs, post holes, tubes, stairs, footings
- Bag counts, not just volume — instant conversion to 60lb and 80lb bags
- Cost estimates built in — budget your project before you spend
- Works offline — because job sites don't always have cell signal
- No ads, no clutter — just a clean tool that does its job
What You Can Calculate
Slabs & Patios
The most common concrete project. Enter length, width, and thickness — get cubic yards and bag counts instantly. The app includes a waste factor setting so you can add a buffer for spillage and uneven ground.
Whether it's a driveway, patio, shed pad, or garage floor, punch in your dimensions and know exactly what to order.
Post Holes & Tubes
Building a fence or deck? Enter the hole diameter, depth, and quantity. The app calculates the total concrete for your entire run of posts in one go.
No more multiplying single-hole volumes by hand. Set 30 post holes and get one total — with bag counts ready to hand to the guy at the hardware store.
Stairs
Concrete stairs are one of the trickiest things to estimate by hand. You need rise per step, run per step, width, and number of steps — and then the math gets ugly fast.
The app handles all of it. Enter your stair dimensions and get a precise volume calculation, complete with a visual preview of the step profile.
Footings & Foundations
Strip footings, wall footings, pier footings — enter length, width, and depth for accurate foundation calculations. Avoid costly over-orders on big jobs or the nightmare of running short during a continuous pour.
Save and Review Your Projects
One feature we're particularly happy with: saved projects. Every calculation you run gets stored so you can review it later, compare different options, or pull up the numbers when you're back at the store.
This is especially useful for contractors running multiple jobs. Name your projects, review the specs, and keep a history of every estimate.
Built for the Job Site
We designed this app to be used with dirty hands and direct sunlight.
- Large, tappable inputs — no tiny text fields
- High contrast results — yellow and black readout you can see outdoors
- Waste factor built in — add 5%, 10%, or custom overage
- Unit switching — feet, inches, meters, centimeters with one tap
- Results in both 60lb and 80lb bags — because stores stock both
The entire app is 24MB and opens instantly. No loading screens, no sign-up walls, no tutorials you have to swipe through.
Who Is This For?
DIY homeowners — Planning a patio, fence, or shed foundation? Know exactly how many bags to buy so you make one trip, not three.
Contractors — Bid jobs faster with precise volume and cost calculations on-site. Save projects and reference them later.
Fence and deck installers — Calculate post hole concrete for an entire fence line in seconds. Enter hole specs and quantity, get one total.
Anyone tired of guessing — If you've ever stood in the concrete aisle wondering "is 40 bags enough?", this app gives you the answer.
Free to Download
Concrete Calculator & Cost Est is free on the App Store. No hidden paywalls for basic calculations.
Download it here: Concrete Calculator & Cost Est on the App Store
Or visit the landing page for more details: concrete-calculator.storqlabs.com
We built this because we needed it. Hopefully you find it just as useful.
Building in Public
We're actively building, shipping, and experimenting. If you want to follow along, see what's coming next, or give feedback, you can find us here:
- Website: https://www.storqlabs.com/
- X (Twitter): https://x.com/StorqLabs
