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The & iPhone/iPod Touch calculators allow you to work with everyday dimensional problems using the same FOOT•INCH•FRACTION units found on the common tape measure or ruler. Prevent errors, save time & get your building project done right the first time.

GETTING STARTED

Both & are designed to be simple & intuitive to use. You enter FOOT•INCH•FRACTION measurements just the way you say them:

ENTER:


Now you can perform common calculator operations on your entry to get the FOOT•INCH•FRACTION answers you need to get the job done right quickly & accurately.

DATA TYPES

NUMBERS	no dimension units e.g., 8 windows
LENGTHS	linear dimensions such as Feet, Inches, Decimal Inches, Meters, etc. e.g. 5' – 5 ¾"
AREAS	expressed in Dec Sq Ft, Dec Sq In, Sq Meters, Sq Miles, etc. e.g., 13.45 sq ft
VOLUMES	expressed in Dec Cu Ft, Dec Cu In, Cu Meters, Cu Yards, etc. e.g., 13.45 cu ft
KEYS
	Clear – clears the display
	Arithmetic operation keys
	Keys for entering Numbers into the display
	Enters Feet when pressed after a Number has been entered
	Enters Inches when pressed after a Number has been entered
	Fraction Bar – divides the numerator from the denominator when pressed after the numerator is entered

ENTERING NUMBERS
Chaining logic is used to enter sucessive intermediate operations using the to complete the chain:



ENTERING LENGTHS

When entering FEET, INCHES & FRACTIONS you must always enter the largest dimension first.


Fractions can only be entered with the following familiar denominators used on rulers & tape measures: x/2 x/4 x/8 x/16 x/32 x/64

To help prevent errors all other denominators are blocked. Likewise, the maximum numerator allowed is 99.

x/16 x/32 x/64 are quickly entered with a single keystroke. Use buttons:

Mixed unit entries such as 5' – 2" + 3.75" stay in the units of the first entry.


ENTERING SQUARE or CUBIC DIMENSIONS ( only - these entries can be made only BEFORE an operator key is pressed)



Sucessive presses of FT or IN cycles through
LENGTH > AREA > VOLUME > LENGTH …


MEMORY

	Clears Memory
	If Memory is clear, enters displayed value into Memory. If a value is already stored in Memory this will add displayed value to it.
	Subtracts the value currently being displayed from the total presently in Memory.
	Recalls & displays the total presently in Memory – also can recall a single stored value for for use in a chain or for reference.

EXAMPLES – BASIC DIMENSIONAL MATH

Adding:	5'- 6 7/16"
Subtracting:	5' – 2 1/16"
Multiplying:	93' – 4 ½"
Dividing:	1' – 3 9/16"
Area SF:	6.71 sq ft
Volume SF:	0.91 cu ft

SETTING FRACTION DENOMINATORS

Info Page: Touch the denominator you want inputs/outputs to be rounded to and displayed.



SETTING DECIMAL PLACES

Info Page: Select the number of decimal places that you want inputs & outputs to be displayed in by touching it.



AREA & VOLUME FORMULAS

Info Page: Touch this button to display common formulas and other information.





RIGHT TRIANGLE FUNCTIONS

The following 4 keys work together to solve right triangle problems. Enter any 2 values & the other 2 are automatically calculated & displayed when their key is touched.

	The angle between a horizontal line & a sloping line expressed in decimal degrees
	The vertical leg of a right triangle
	The horizontal leg of a right triangle
	The sloping leg of a right triangle

CONVERSIONS

Any dimensional value in the display can be converted to any of the following units by pressing the desired conversion unit key with the exception of FIF & IF, which only can be converted to other linear units.

	Feet Inches Fractions
	Inches Franctions
	Decimal Inches, Sq Dec In, Cu Dec In
	Decimal Feet, Sq Dec Feet, Cubic Dec Ft
	Millimeters, Sq Millimeters, Cu Millimeters
	Centimeters, Sq Centimeters, Cu Centimeters
	Meters, Sq Meters, Cu Meters
	Decimal Sq Acres
	Decimal Yards, Sq Yards, Cubic Yards
	Decimal Sq Miles, Cu Miles

COMMON BUILT IN FUNCTIONS

	Returns the square root of any Number value in the display.
	Squares any Number or Length in the display.
	Put the constant pi (3.141593) in the display.
	Returns a given percent of any Number, Length, Area or Volume in the display.
	Changes the sign of any Number or Length in the display.

KEYBOARD SETUP



User can select preferred keyboard setup by either pressing the Lefty or Righty key or holding the iPhone/iPod Touch in the vertical position & rotating counterclockwise for Lefty or clockwise for Righty.

CLEARING FUNCTIONS

These keys give you 3 choices to clear the display & make it easy to continue a chain calculation without starting over if a mistake is made:

	Backs out the last single keystroke or resets to zero if the last keystroke was
	Clears the entire entry that is is progress or the pending operation.
	Resets the display to zero.

DISCLAIMER

River Studio Design makes no warranty or representation, either express or implied, with respect to the product's quality, performance, or fitness for a particular purpose. As a result, this product, including but not limited to, keystroke procedures, mathematical accuracy and preprogrammed material, is sold "as is," and you the purchaser assume the entire risk as to it's quality and performance.

In no event wil River Studio Design be liable for direct, indirect, special, incidental, or consequential damages resulting from any defect in the product or it's documentation.