# Black Friday 2026 — 30% Off Chippy Tools Pro Carpentry Calculator Stop doing job-site maths in your head. Get 30% off your first year of Chippy Tools Pro + a 7-day free trial. Stairs, roofs, concrete, square — 14+ pro calculators that work offline. - Canonical HTML: https://www.chippy.tools/black-friday/ - Publisher: Chippy Tools - Language: en - Updated: 2026-11-08 Black Friday · 30% Off Yearly # 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 350,000+ downloads 4.6 2,786 ratings · App Store 3.8 181 ratings · Google Play ## How your 7-day trial + 30% Black Friday discount works Try the full toolkit on the job before paying a cent. 1. 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. 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. 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](https://www.chippy.tools/features/) or [view full pricing](https://www.chippy.tools/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](https://www.chippy.tools/pricing/) 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](https://account.chippy.tools/login), 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](https://account.chippy.tools/login) — 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.