Stop doing job-site maths in your head
Stairs, roofs, concrete, square — 14+ pro calculators that work offline. Start your 7-day free trial today and lock in 30% off your first year.
- 14+ pro calculators: stairs, roofing, concrete, square and more
- Works offline — no signal needed on site
- Metric and imperial, on every iPhone & Android device
Display currency
350,000+
downloads
2,786 ratings · App Store
181 ratings · Google Play
Black Friday Offer
30% off your first year on the Yearly plan
Try free for 7 days, then A$20.99
Just A$1.75/mo for your first year
Then A$29.99/yr after your first year. Cancel anytime.
Limited-time offer
Ends midnight Cyber Monday
Offer Ended
The Black Friday / Cyber Monday 2026 sale has ended
You can still start a 7-day free trial of Chippy Tools Pro on the Yearly plan (A$29.99/yr).
How your 7-day trial + 30% Black Friday discount works
Try the full toolkit on the job before paying a cent.
- 1
Today — Start your 7-day free trial
Create your Chippy Tools Pro account above and confirm on Stripe checkout. Nothing is charged today.
- 2
Days 1–7 — Put every calculator to work
Download Chippy Tools on iPhone or Android and sign in. Cancel anytime before day 7 and pay $0.
- 3
Day 7 — 30% off your first year
Your 30% Black Friday discount is applied automatically to your first yearly billing cycle, with a downloadable tax invoice.
Every Chippy Tools Pro calculator, unlocked
Built by a carpenter for chippies, builders, landscapers, and serious DIYers.
Stair & Baluster Calculators
Compliant riser height, going depth, stringer length, and exact baluster spacing in millimetres or feet & inches.
Roof Pitch & Rafter Length
Pitch angle, rise, run, common rafter length, and plumb/seat cuts without touching a trig table.
Concrete, Gravel & Post Holes
Cubic metres or yards, premix bag counts, wastage allowance, and slab/footing breakdowns.
Check Square & Right Triangles
Instant 3-4-5 diagonal square checks and triangle solver for decks, slabs, and wall framing.
Raked Walls, Decking & Equal Spacing
Stud heights at every spacing, decking board & joist counts, and centre-to-centre set-out.
Offline Mode + Tax Invoices
Works with zero reception on site, speaks measurements aloud hands-free, and includes downloadable tax invoices.
Want to see all calculators or compare Weekly & Monthly plans? Explore all calculators or view full pricing.
Black Friday Offer Questions
How does the 30% Black Friday discount work?
When you start your 7-day free trial on this page (or select the Yearly plan on our Pricing page before midnight Cyber Monday, 30 November 2026), the 30% Black Friday coupon is applied automatically at checkout. You pay $0 today, get 7 days free, and then pay 30% off for your entire first year.
Will I be charged today?
No. Your first 7 days are completely free. If you cancel anytime during your 7-day trial from Manage Account, you won't be charged a cent.
What happens after the first year?
The 30% discount applies to your first year on the Yearly plan. After your first year, your subscription renews at the standard yearly rate unless you cancel beforehand.
Can I get a tax invoice for my trade business?
Yes. Subscribing directly through our website gives you instant access to downloadable tax invoices for every payment in Manage Account — ideal for claiming your trade tools at tax time.
Does my subscription work on both iPhone and Android?
Yes. Your Chippy Tools Pro account works across both iOS and Android — just download the app from the App Store or Google Play and sign in with the email address you used at checkout.
30% off the yearly plan for your first year, then renews at the standard rate. Applied automatically at checkout. Offer ends midnight Cyber Monday, 30 November 2026, wherever you are.