Drill Calc vs SegmentedBowlCalculator

Need to find the right drill bit size for a hole? Drill Calc calculates the correct drill bit size to use for threaded holes, based on the bolt (tap) diameter and thread pitch and percentage, for both inch and metric threads. Close and tight fit hole sizes for many popular drill sizes are also displayed. It also has tables of standard inch fractional and numeric drill bit sizes, as well as complete information for various pipe sizes. There is also detailed information about the commonly used sizes of wood screws. Buy your copy of Drill Calc today, and put away your drill chart.

Segmented Bowl Calculator does the angle math for segmented woodturning — so you don't have to do it in your head at the workbench. A segmented bowl is only as good as its angles: 180° divided by the segment count, cut consistently across every piece in every ring. Get one angle wrong and it shows up as a gap that grows around the ring, then repeats on the next ring stacked on top. This app exists to make that math reliable, every time. SOLVE EITHER DIRECTION Know the diameter you want? Enter it and get the exact base length to cut each piece to, plus the cut angle. Working from a board you've already got? Enter its length instead and get the resulting diameter. BUILT FOR YOUR SHOP Type dimensions the way they're actually marked — mixed-number inches like 3 5/16", rounded to whatever precision you choose, down to 1/64". Prefer metric? Switch to millimeters or centimeters, no conversion required. ORGANIZE A WHOLE BOWL Stack as many rings as a project needs under one named Bowl Project, reorder them by drag and drop, and come back anytime to check dimensions before you cut. Need a fast answer that doesn't need saving? Quick Calculate gives you the same calculator with nothing to file away afterward. RESPECTFUL BY DESIGN No ads. No tracking. No analytics. No account, no server, no internet connection required — ever. Every project and setting stays on your device, stored locally and nowhere else. Whether you're planning your first segmented bowl or your fiftieth, Segmented Bowl Calculator handles the geometry so you can focus on the wood.