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The Geometric calculator works like a Hewlett Packard reverse polish notation calculator.

The calculator has a stack of four values: a, b, c, and t. a is displayed in a window above the keyboard, and b is displayed in a window above a. The values of c and t can be viewed by rotating the stack with the <<< key.

Numbers are entered into a using the numerical digits, the ., the E, the +/-, the x, the y, the z, and the ENTER keys. The backspace, < -, key can be used to correct errors.

The other keys perform operations on the stack, either replacing a with a new value, replacing a and b with a new value, moving stack elements around, or clearing the stack.

Here are the definitions of the calculator keys from left to right and from top to bottom.

	Store a into a register.
	Recall a from a register.
	Cosine of a.
	Sine of a.
	Tangent of a.
	Unassigned.
	Unassigned.
	Copy c into t, b into c, and a into b.
	Exchange a and b.
	Rotate the stack downwards.
	Erase the last character entered, or clear the calculator.
	Replace a with its multiplicative inverse.
	Divide a by its magnitude.
	Clear the calculator.
	Enter the x basis into a.
	Enter a 7 into a.
	Enter an 8 into a.
	Enter a 9 into a.
	Divide b by a.
	Inner product of b and a.
	Replace a with its grade 0 part, ie its scalar part.
	Replace a with its grade 1 part, ie its vector part.
	Enter the y basis into a.
	Enter a 4 into a.
	Enter a 5 into a.
	Enter a 6 into a.
	Geometric product of b and a.
	Outer product of b and a.
	Replace a with its grade 2 part, ie its bivector part.
	Replace a with its grade 3 part, ie its trivector part.
	Enter the y basis into a.
	Enter a 1 into a.
	Enter a 2 into a.
	Enter a 3 into a.
	Subtract a from b.
	Replace a with its reverse, or conjugate.
	Replace a with its even grade part.
	Replace a with its odd grade part.
	Change the sign of a, or of a's exponent.
	Enter a 0 into a.
	Enter a decimal point into a.
	Enter a power of ten exponent a.
	Add a to b.
	Replace a with its magnitude.
	The product of -b a b.
	The product of b a b*.