diff --git a/convert.php b/convert.php
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+<?php
+/**
+ * Temperature conversion script
+ *
+ * Converts a provided value from Celsius to Fahrenheit, or vice versa.
+ */
+
+// Collect user input and current default temperature scale (stored by Alfred)
+$query = $argv[1];
+$default_scale = getenv( 'default_scale' );
+
+// Initialize items array
+$items = array(
+	'items' => array(),
+);
+
+// If no scale is provided, and a default is set, use the default
+if ( ! preg_match( "/[f,c]{1}$/i", $query ) && false != $default_scale ) {
+	if ( 'Fahrenheit' === $default_scale ) {
+		$temp = $query . 'f';
+	} elseif ( 'Celsius' === $default_scale ) {
+		$temp = $query . 'c';
+	}
+// Otherwise, save user input as-is
+} else {
+	$temp = $query;
+}
+
+// Verify the temp is valid:
+//		Regex pattern:
+//		Optional `-` to support negative integers
+//		Any number of numeric digits
+//		A single 'f' or 'c' (case insensitive) to declare the current scale being entered
+if ( ! preg_match( "/^-?[0-9]+[f,c]{1}$/i", $temp ) ) {
+	// Prepare prompt for display when invalid temp is detected
+	$title = "Enter a temperature to convert";
+	$subtitle = "Be sure to use 'C' or 'F' (or set a default scale below)";
+	$result = '';
+	$validity = 'false';
+} else {
+	// Strip scale from string so the numeric value can be processed
+	$input_temp = substr( $temp, 0, -1 );
+
+	// Prep values if the input scale is Fahrenheit
+	if ( preg_match( "/f/i", $temp ) ) {
+		$output_temp = intval( ( 5 / 9 ) * ( $input_temp - 32 ) );
+		$converted_scale = 'Celsius';
+		$input_abbr = '°F';
+		$output_abbr = '°C';
+		// Prep values if the the input scale is Celsius
+	} elseif ( preg_match( "/c/i", $temp ) ) {
+		$output_temp = intval( ( 9 / 5 ) * $input_temp + 32 );
+		$converted_scale = "Fahrenheit";
+		$input_abbr = '°C';
+		$output_abbr = '°F';
+	}
+
+	// Save the various values to the relevant strings
+	$full_conversion = $input_temp . $input_abbr . "/" . $output_temp . $output_abbr;
+	$converted_only = $output_temp . $output_abbr;
+	$title = "Convert $input_temp" . "$input_abbr to $converted_scale";
+	$subtitle = "Output full conversion: $full_conversion";
+	$validity = 'true';
+}
+
+// Build the temperature conversion list item
+$items['items'][] = array(
+	'title'    => $title,
+	'subtitle' => $subtitle,
+	'arg'      => $full_conversion,
+	'valid'    => $validity,
+	'mods'     => array(
+		'cmd' => array(
+			'subtitle' => "Output $converted_scale only: $converted_only",
+			'arg'      => $converted_only,
+		),
+	),
+);
+
+// Build the temp. scale setting list item
+$items['items'][] = array(
+	'title'    => 'Set default temperature scale',
+	'subtitle' => 'CMD for Celsius or OPTION for Fahrenheit',
+	'valid'    => 'false',
+	'mods'     => array(
+		'cmd'    => array(
+			'subtitle'  => 'Set default temperature scale to Celsius',
+			'arg'       => 'Celsius',
+			'valid'     => 'true',
+			'variables' => array(
+				'set_default' => 'true',
+			),
+		),
+		'option' => array(
+			'subtitle'  => 'Set default temperature scale to Fahrenheit',
+			'arg'       => 'Fahrenheit',
+			'valid'     => 'true',
+			'variables' => array(
+				'set_default' => 'true',
+			),
+		),
+	),
+);
+
+// Output script filter list items
+echo json_encode( $items );
diff --git a/readme.md b/readme.md
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+# Alfred Temperature Converter
+
+This workflow will output temperatures converted between Fahrenheit and Celsius.
+
+## Converting Temperatures
+The workflow can be activated by entering the keyword `tc` (short for Temperature Converter) into Alfred.
+
+Once the workflow is activated, input your temperature in whole numbers only (no decimals).
+
+If you have set up a default temperature scale, it will be applied automatically.
+
+If you haven't yet set a default, or if you would like to convert in the opposite direction, add an 'f' for Fahrenheit or a 'c' for Celsius. Be sure to add the letter corresponding the the temperature you are converting *from*.
+
+## Setting a Default Scale
+
+You can select either Fahrenheit or Celsius as the default scale that you usually enter temperatures in.
+
+Launch the workflow with the usual keyword, and arrow down to the `Set default temperature scale` option.
+
+Use `CMD + RETURN` to set your default to Celsius. Use `OPTION + RETURN` to set your default to Fahrenheit.
+
+Please allow 10-15 seconds for Alfred to update the Workflow configuration files before relaunching the workflow.
+
+You may change this default at any time.
+
+## Conversion Formatting
+
+By default, the workflow will output the original temperature along with the converted temperature, like so:
+
+*32°F/0°C*
+
+However, if you hold the `CMD` key while processing your conversion, it will output just the converted temperature, like so:
+`0°C`
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