Bad Owl Tool - Mobile Woodworking App

Bad Owl Tool: Your Woodshop Wingman

Let’s roll up our lab coat sleeves and get straight to the point: Bad Owl Tool is a free, no-nonsense digital toolkit engineered specifically for real woodworkers. Whether you’re a professional batching out custom cabinets or a dedicated hobbyist dialing in your first set of dovetails, we’ve built a single, reliable place to handle the shop math that slows you down.

No fluff. No gimmicks. Just pro-grade calculators, precision levels, and shop-proven finishing recipes designed to turn your phone into the most reliable jig on your workbench.

  • Google Play Store

    The ultimate maker app, optimized for your Android.

    Install Now 

  • Instant Web Version

    Launch instantly. Save to your home screen for a native app feel.

    Start Now 

  • Apple Store

    The ultimate maker app, optimized for your iPhone.

    Coming Fall 2026

Built by Woodworkers, Engineered for the Shop

Bad Owl Tool was created to solve the everyday bottlenecks that interrupt a good workflow. We got tired of guessing board footage, squinting at greasy drill bit charts, doing epoxy volume math on the back of a scrap piece of plywood, and trying to calibrate machinery with sketchy apps. We needed a trustworthy digital assistant—so I scanned the specs, calibrated my optics, and built one.

What You Can Do with Bad Owl Tool:

Milling & Dimensioning

  • Board Foot & Species Database: Calculate board feet, estimate your lumber costs, calculate project weights, and explore the properties of different wood species.
  • Units & Fractional Converters: Instantly convert length, volume, and weight with multi-input fields and automatic fractional inch readouts so you can go straight to your tape measure.

Hardware & Joinery

  • Tap & Drill Helper: Never strip a screw again. Find exact drill bit sizes, clearance holes, and pilot hole recommendations specifically tuned for hardwood versus softwood.
  • Triangle & Angle Calculators: Quickly calculate missing side lengths and angles using Side-Angle-Side or Angle-Side-Angle modes for perfect shop geometry.

Specialty Shop Calculators

  • Bandsaw Radius Finder: Calculate the minimum cutting radius for your blade, filtering by width, TPI, kerf, and material.
  • Picture Frame Layout: Calculate side lengths, glass dimensions, rebates, and maximum frame sizes from your stock, complete with visual diagrams.
  • Segmented Turning: Plan intricate bowls by calculating cut angles, segment lengths, and exact ring diameters.

Finishes, Adhesives & The Apothecary

  • Epoxy & Finish Coverage: Accurately estimate resin volumes for river tables and finish coverage areas so you never run dry in the middle of a coat.
  • Glue Finder: Compare PVA, hide glues, and CA adhesives based on open time and water resistance to choose the perfect bond for your joinery.
  • The Apothecary: Access a curated library of traditional recipes to mix your own shellac, natural stains, and hide glue, complete with safety and difficulty guides.

Utility & AI

  • Precision Levels: Bullseye and linear levels featuring custom zero baselines and individual surface calibration for real-world shop use.
  • Birdbrain AI: Meet your new AI woodshop foreman. Generate project blueprints and get uncompromising woodworking advice.

Start Free. Build Wiser.
Bad Owl Tool is completely free to use, with zero mandatory paywalls for our core features. As a family-run business, we fund the hosting, development, and regular rollout of new features through the Bad Owl Tool online store. Every time you purchase your premium tools, finishes, and curated supplies from us, you directly support the continued development of this digital toolkit.

Sign up, log in, and take it to the bench. Your woodshop wingman is ready whenever you are.

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