Meet BOB
The Estimator
A purpose-built estimating app designed specifically for carpenters and small builders. BOB takes the guesswork out of pricing your jobs — building accurate, professional estimates and material lists based on your own rates, directly from your phone or tablet whether you're on-site or back in the office.
Stop pricing from gut feel.
Too many tradies are either under-pricing jobs and leaving money on the table, or spending hours at the desk trying to pull numbers together from memory and rough notes. BOB was built to fix both of those problems. Enter your materials, labour and margins the way you actually work, and let BOB do the maths.
The app is built around real carpentry workflows. From framing and roofing through to fit-out and finishing, BOB lets you itemise every part of a job quickly and confidently. Generate clear, professional estimates that you can send straight to your clients — no more scribbling numbers on the back of an envelope, and no more pricing from gut feel and hoping for the best.
Everything in your pocket
A full suite of calculators
Alongside the estimating tools, BOB features a full suite of on-site calculators built for the way carpenters and builders actually work.
Rafter Calculator
Covers full roof geometry including HAP (Height at Plate), bird's mouth, ridge shortening, and both plumb and level cuts. Everything you need to frame a roof, right there in your pocket.
Pitch Calculator
Enter any two of rise, run, or pitch angle and BOB calculates the third. Simple, fast, and accurate every time.
Right Angle Calculator
Square any corner on-site without the mental gymnastics. Enter your measurements and BOB confirms your diagonal, keeping your work true from the start.
Stair Calculator
Work out your rise heights and quantities of stair materials quickly and accurately, so you can price and build stairs with confidence.
Concrete Calculator
Calculate concrete quantities for any pour so you're ordering the right amount every time — no costly over-orders or frustrating shortfalls.
Volume Calculator
Work out volumes for any part of a job where you need to know cubic quantities fast.
Markup & Margin Calculator
Understand the real difference between markup and margin percentage so you're always pricing for actual profit, not just covering costs.
Whether you're pricing a small renovation or a full residential build, BOB gives you the tools to estimate faster, price smarter, and run a more profitable trade business.
See how BOB works
Get your evenings back.
Tradespeople are some of the hardest-working people on the planet — but too many are losing hours in productivity or spare time simply because estimating is slow, confusing, or just never taught on the tools. BOB The Estimator exists to change that.
We aim to reduce the time spent on estimating to help you get back your evenings with the family, and increase productivity on-site with our range of handy calculators. Estimates first, quotes later — because a job priced confidently starts long before the paperwork does.
Our goal is to put a professional-grade estimating tool in the hands of every carpenter and small builder, regardless of their paperwork experience. We want tradies to finish a job site conversation and have a solid estimate ready before they've driven off the driveway. When tradespeople price confidently, they build sustainable businesses — and that's better for everyone.
Frequently asked questions
How do I delete my account?
In BOB The Estimator, go to Settings → Account Details → Delete Account, then confirm. Please note this action is permanent and cannot be undone.
Can't find what you need? Get in touch — we reply within 1–2 business days.