Kathleen's RV-7a builder's site
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The following utilities have mostly been provided by other people.  I don't regard them as completely reliable, so use them, but do check the results for accuracy.
Box Volume Calculator Compute Gallons or volume from inches or feet.  Very useful for fuel tanks if they are rectangles.
 
Barrel Volume Calculator Compute Gallons or volume from inches or feet of a standard barrel.  Input radius and height.
 
Cone Volume Calculator Compute Gallons or volume from inches or feet of a cone shaped container.  Input radius and height.
 
Atmospheric Calculator

A marginally useful tool for calculating certain atmospheric conditions related to temperature and humidity.
Atmospheric calculator A more relevant tool for calculating atmospheric conditions related to air density, mach number, Reynolds number etc.
 

Volume of a barrel

 Computes missing elements.  Does not compute gallons.  Some day I may try to modify it for gallons to make it more useful.
 
Area Conversion Somewhat useful, but uses notation where decimals would be far more readable and relevant.
 
BNC Connector Instructions Step by step for installing BNC connectors.
 
Cyl Volume - One Domed End Compute the volume of a cylinder with a dome on one end - the dome must be constant radius and a half circle.
 
Cyl Part Vol - One Domed End Same as above, but computes a partially filled cylinder's volume and gallons content.  The cylinder must be assumed to be on it's side.  Plenty useful -- right?
 
Cyl Vol - 2 Domed Ends Compute the volume capacity in gallons of a cylinder with domed ends.  That's a cylinder like a residential or supply truck propane tank.
 
Cyl Part Vol - 2 Domed End Same as above except calculates volume of contents as gallons or volume.
 
Cyl Volume (on side part full) Calculate the volume or gallons content of a cylinder lying on its side.  You can measure the contents of a partially full cylinder with this tool.
 
Cyl Volume (also, with core) Now here's a really useful item! :-)  You can compute the volume of a cylinder with a core.  Really, you can just use it a cylinder volume and gallons calculator, too.
 
Elliptical Tank Volume (part full) Compute the volume and gallons of an elliptical tank (like a fuel delivery truck tank) or the contents if it is less than full.
 
Ellipsoid Volume What can I say?  This is perfect for every time you need to compute the volume or gallons held in a ellipsoid shaped container!
 
Polygon Volume Does what is says, in inches, feet or gallons...
Pyramid (rect base) Volume Computes the volume or gallon capacity of a pyramid with a rectangular base and top.
 
Pyramid (by area) Volume Same as above, except you feed it the area of the top and bottom.  If you know the area, wouldn't you know the dimensions?
Sphere Volume Got a perfectly round container like a basketball?  This one computes the volume or gallon capacity of spheres.  Have at it!
 
Sphere Partially Full Volume Same as above, but you can compute the quantity or volume of what's in the sphere.
 
Trapezoid Volume Computes the volume or gallons held in a trapezoidal shaped container.  I've actually had to use this one!
Trapezoid Volume (revolved) Same as above, but lets you consider revolving the trapezoid on one axis for additional calculations.  Useful?  Hmmmm.
 
Weight of Metals Calculate the weight of all kinds of metals.  This one really is useful and easy to use!
 
Wire Gauge Conversion Chart Compares AWG and Gauge of wire.  Includes actual wire size.
Wave Length Calculator Calculates the wavelength of a radio frequency.  Useful when working with antenna setup.
Metal Hardness Conversion Converts between Brinel, Rockwell and tensile strength.
LED Resistance Calculator Calculate the resistance and proper resistor to power an LED for whatever lighting purpose.  I used it to test my navigation light project.
Energy Converter A marginally useful calculator that converts energy with the annoying habit of using notation....
Flow Rate of Liquids Convert the flow rate of liquids.  Especially useful if you are working with a miner's inch :-)
Rotation Frequency Converter Conver RPM or Frequencies
Torque Wrench Setting Dan Checkoway's handy torque extension computation program.  This is no longer a link to the his site due to downtime.
Wedge Shaped Tank Volume Calculate the volume or gallons of a wedge shaped tank.
Hardware Identification Table MS, NAS and some AN number of hardware from rivets to rivnuts to pins and bolts and washers.
Fraction to Decimal Conversion That's it.  A table that converts fractions to decimals.
FADEC Schematic Just a simple schematic of a 6 cylinder FADEC system.
Vapor Pressure Calculator If you know the temperature and dewpoint, this calculator does all the pressure calculations.  Not much use for most aircraft applications unless you are doing detailed instrument calibrations.
Aircraft Turn Rate Calculator Calculate turn rate, distance and time based on speed and bank.
E6B Aviation Calculator Yep!  All the E6B functions....
Time Zone Calculator Compare your time to time zones around the world.
Density Altitude Chart A usefull gnereal density altitude chart - good to print out.
GPS Distance Calculator Enter coordinates and get direction and distance with this simple distance calculator.
Density Altitude Calculator Simple to use density altitude calculator.
Flight Distances Between Airprots Let's you calculate the flight distances and heading between a few selected major airports.
Propeller Repair & Pitch Simple guide to fixed-pitch (or other) prop repair with notes on changing pitch from Sensenich.