The Carpenter's Calculator

Professional construction calculators that work offline. Stairs, concrete, roof pitch, baluster spacing and more — all in one app.

Free to download. Baluster Spacing is included free. Try every Pro calculator for 7 days with no card required. See current plans.

350,000+ downloads
4.6 App Store
17 calculator guides
App screenshot App screenshot

Every Calculator. One App.

From stairs to concrete, roof pitch to baluster spacing — every calculation a builder needs, right in your pocket.

Testimonials

Trusted on Job Sites Worldwide

"I've used this app for setting out triangulation for foundations, internal wall, roofs garden walls, you name it. The spacing tool is great too. I'd be lost without this app."

N
nu/da
United Kingdom · App Store

"Very good"

As a carpenter myself, I would find it impossible to do my job without Chippy Tools. How did Jesus manage it?

9
997ryan
Australia

"Excellent app! Dumpy level user's friend."

I'm an archaeologist and was looking for something to calculate elevations while using a dumpy level on site. This is an excellent app and speeds up calculating so I can get on to other work faster. I've only bought the one year, but will definitely pay for a lifetime subscription when it ends. $35 is pricey for an app, but it works and that's worth it over years of excavation.

A
Amcalm4
United States

"Great app."

Not a lot of money to pay for something so useful and user friendly. I use it all the time.

T
toakers
United Kingdom

"Everything you need for your next DIY"

Started using the app recently for an at home diy and couldn't have better things to say! Made figuring out all the quantities I needed quick, easy and accurate! Definitely a must have for any project home or otherwise!

S
Sass13466
Australia

"Accurate and very easy to use"

As a home builder I use chippy tools regularly. Very user friendly and saves me time and materials.

J
Jeffmuir
Australia

"Great app."

Great app!! Highly recommend. Developers keeping up to date, adding new features!! would love for them to keep coming. Very handy for all your calculation needs.

H
Haydgger
Australia

See It In Action

Watch how Chippy Tools simplifies complex calculations into a few taps.

Built for the Job Site

Works Offline

No internet connection required. Calculate measurements anywhere on the job site, even in areas with no signal.

Metric & Imperial

Switch seamlessly between metric and imperial measurements with a single tap. Supports millimetres, feet, inches and fractions.

Reduce Costly Errors

Order the exact materials you need. Avoid expensive over-ordering or project delays from under-ordering.

Ready to Build Smarter?

Join 350,000+ builders, carpenters and DIY enthusiasts who trust Chippy Tools on the job site.

Latest How-To & DIY Guides

Practical, step-by-step tips for every builder and DIY enthusiast.

Frequently Asked Questions

Need help? Contact us

Who is Chippy Tools for?
The app is ideal for Architects, Builders, Carpenters, Construction Workers, Contractors, Designers, DIY Enthusiasts, Engineers, Tradesmen and Woodworkers — anyone looking to make common construction calculations with speed, ease and accuracy.
What features do I get for free?
The free version includes the Baluster spacing calculator, support for millimetres, feet and inches, and our user-friendly interface.
Is the app available for both iOS and Android?
Yes, Chippy Tools is available for both iOS and Android devices. You can download it from the App Store or Google Play Store.
Does the app work with both Metric and Imperial measurements?
Yes. You can seamlessly switch between metric (e.g., millimetres) and imperial (e.g., feet, inches, and fractions of an inch) units to suit your project's requirements.
Is Chippy Tools Pro a subscription or a one-time purchase?
You can subscribe directly through our website or through the App Store or Google Play. Available plans and prices can differ by purchase channel and region. Check the website for direct plans and the app for current store options.
If I buy a new phone, do I need to purchase the app again?
For an App Store or Google Play purchase, use the same store account and restore your purchase in the app. For a direct subscription, sign in with the Chippy Tools account you used to subscribe. If you are changing platforms, contact us to check your options.
How accurate are the calculations?
Our calculations are built on standard, industry-accepted mathematical formulas, tested extensively for on-site accuracy. Always double-check critical measurements and adhere to local building codes as a best practice.