For those of you who have iPads and/or iPhones I've found a few apps that are very helpful in my shop. I the case of the Drill Calc app, it allowed me to ditch the flimsy paper printouts I kept as reference. Plus it provides more info than I had on my chart. The INCHcalc app I use on a regular basis to add and subtract fractional feet and inches.
Check them out, you may find something useful. If you have some favorites or can recommend some Android apps please post them. INCHcalc ($1.99)
This is the app I find most useful. It has a very handy, full-screen (large display and buttons) calculator that lets you make calculations in feet, inches, and fractions. You can set the Fraction denominator from half inches to as low as 64ths of an inch. (I have mine set at 32nds.) For example if you type in 3 FT 7 IN 3/4 (3' 7 3/4") and divide by 4, you'll get 10 15/16". Much easier than I can do in my head or by trying to convert everything to decimal inches.
It also has the formulas for finding the areas of squares, triangles, circles, rectangles, ellipses, octagons, cubes, spheres, cylinders, rectangular boxes, and cones.
The app works on iPad and iPhone. Woodmaster HD ($7.99)
I don't use this app often, but it has some nice features such as the screw size / hole chart. Some of the other features are nice references, and the Golden Ratio calculator can be handy. Woodmaster HD is a dedicated woodworking app with the following functions:
Board foot calculator: Includes a Tally count and tally cost. Using the Tally feature, you could enter varying sizes of wood stock in groups. For example, enter all 2x4’s, add it to the Tally, then 2x6’s, add it to the Tally, etc. You can basically use the Tally feature to estimate the cost of an entire woodworking project
Fraction to decimal converter: Select a fraction and it will display the equivalent decimal and millimeter.
Length converter: convert from millimeters / centimeters / meters / inches / feet / yards to any of the listed.
Proportional Calculator: Enter an original width and height and then enter either the new width or height and calculate. Handy for enlarging or reducing projects proportionally.
Golden Ratio: Enter any dimension and it will give you the Golden Ration proportions.
Nominal to Actual Sizes: Actual size in inches and millimeters for wood from 1 x 2 to 4 x 6.
Screw Sizes: chart with head bore, shank hole, hardwood pilot hole, and softwood pilot hole sizes for screws from #2 to #14.
Nail Sizes: showing length in inches and centimeters from nails from 2d to 100d.
Wood Types: with nice photos of some of the most common types used in woodworking
Joint Types: Illustrations of Bevel, Butt, Dado, Rabbet Dado, Dovetail, Box, French Dovetail, Fingered, Lap, Mitered, Mortise & Tenon, Rabbet, Scarf, Tabled Scarf, and Tongue & Groove joints with links to YouTube videos on how to do them. Drill Calc ($2.99)
I use this app infrequently but again it saves me from having to dig around for a paper printout with the information. With drill calc you can choose a standard bolt size from #000-120 to 1 7/8 x 5 and find the correct drill and tap sizes in both numbered drill and fractional drill sizes and also recommends other options that are close to optimum size in case you don't have the correct size bit.
It has a list of both numeric and fractional drill sizes with their size listed in both decimal inches and millimeters. Does NOT do metric bolt sizes.