diff --git a/wire/modules/Inputfield/InputfieldCheckboxes/InputfieldCheckboxes.css b/wire/modules/Inputfield/InputfieldCheckboxes/InputfieldCheckboxes.css
index 75794373..31197282 100644
--- a/wire/modules/Inputfield/InputfieldCheckboxes/InputfieldCheckboxes.css
+++ b/wire/modules/Inputfield/InputfieldCheckboxes/InputfieldCheckboxes.css
@@ -49,6 +49,13 @@
 	padding-bottom: 1%; 
 }
 
+.Inputfields .InputfieldCheckboxesWidth li {
+	display: inline-block;
+}
+.Inputfields .InputfieldCheckboxesWidth li label {
+	white-space: initial;
+}
+
 .InputfieldCheckboxes table label {
 	white-space: nowrap;
 }
diff --git a/wire/modules/Inputfield/InputfieldCheckboxes/InputfieldCheckboxes.module b/wire/modules/Inputfield/InputfieldCheckboxes/InputfieldCheckboxes.module
index f2904fb5..97c8f4a2 100644
--- a/wire/modules/Inputfield/InputfieldCheckboxes/InputfieldCheckboxes.module
+++ b/wire/modules/Inputfield/InputfieldCheckboxes/InputfieldCheckboxes.module
@@ -1,11 +1,15 @@
 <?php namespace ProcessWire;
 
 /**
- * Class InputfieldCheckboxes
+ * ProcessWire Checkboxes Inputfield
+ * 
+ * ProcessWire 3.x, Copyright 2021 by Ryan Cramer
+ * https://processwire.com
  * 
  * @property bool $table Whether or not to display as a table
  * @property string $thead Pipe "|" separated list of table headings. Do the same for the addOption() labels. 
  * @property int|bool $optionColumns Specify 1 for inline list of options, or qty of columns to list options in.
+ * @property string $optionWidth Alternative to optionColumns, specify option width like '222px', '22em', etc. or '1' for auto. 3.0.184+
  * 
  */
 
@@ -15,20 +19,33 @@ class InputfieldCheckboxes extends InputfieldSelectMultiple implements Inputfiel
 		return array(
 			'title' => __('Checkboxes', __FILE__), // Module Title
 			'summary' => __('Multiple checkbox toggles', __FILE__), // Module Summary
-			'version' => 107,
+			'version' => 108,
 			'permanent' => true, 
-			);
+		);
 	}
 
+	/**
+	 * Init
+	 * 
+	 */
 	public function init() {
 		$this->set('table', false); 
 		$this->set('thead', ''); 
 		$this->set('optionColumns', 0);
+		$this->set('optionWidth', '');
 		parent::init();
 		$this->set('size', null); // cancel 'size' attribute used by select multiple
 	}
 
+	/**
+	 * Render 
+	 * 
+	 * @return string
+	 * 
+	 */
 	public function ___render() {	
+		
+		$sanitizer = $this->wire()->sanitizer;
 
 		$this->checkDefaultValue();
 		$out = '';
@@ -37,16 +54,22 @@ class InputfieldCheckboxes extends InputfieldSelectMultiple implements Inputfiel
 		$inline = $columns === 1 || $columns > 10; 
 		$liAttr = '';
 		$ulClass = '';
-		$inputClass = $this->wire('sanitizer')->entities($this->attr('class'));
+		$inputClass = $sanitizer->entities($this->attr('class'));
 		$entityEncode = $this->getSetting('entityEncodeText') === false ? false : true;
-
+		$options = $this->getOptions();
+		$optionWidth = $this->optionWidth ? $this->getOptionWidthCSS($this->optionWidth, $options) : '';
+		
 		if($this->table) {
 			/** @var MarkupAdminDataTable $table */
-			$table = $this->modules->get("MarkupAdminDataTable"); 
+			$table = $this->modules->get("MarkupAdminDataTable");
 			$table->setEncodeEntities(false);
 			$table->setSortable(false);
 			$table->addClass('pw-no-select');
-			if($this->thead) $table->headerRow(explode('|', htmlspecialchars($this->thead, ENT_QUOTES, 'UTF-8'))); 
+			if($this->thead) $table->headerRow(explode('|', htmlspecialchars($this->thead, ENT_QUOTES, 'UTF-8')));
+			
+		} else if($optionWidth) {
+			$liAttr = " style='width:$optionWidth'";
+			$ulClass = 'InputfieldCheckboxesWidth';
 
 		} else if($columns) {
 
@@ -67,12 +90,12 @@ class InputfieldCheckboxes extends InputfieldSelectMultiple implements Inputfiel
 
 		if(!$table) $out = "<ul class='$ulClass'>";
 
-		foreach($this->getOptions() as $key => $value) {
+		foreach($options as $key => $value) {
 			$checked = '';
 
 			if($this->isOptionSelected($key)) $checked = " checked='checked'";
 			
-			$id = $this->wire()->sanitizer->name($key);
+			$id = $sanitizer->name($key);
 			if(!strlen(trim($id, '_'))) $id = trim(base64_encode($key), '=/.');
 			$id = $this->id . '_' . $id;
 
@@ -98,7 +121,6 @@ class InputfieldCheckboxes extends InputfieldSelectMultiple implements Inputfiel
 				$value[0] = "$input<span class='pw-no-select'>$value[0]</span></label>";
 				$table->row($value); 
 			} else {
-				//$value = str_replace(' ', ' <wbr>', $value);
 				$out .= "<li$liAttr>$input<span class='pw-no-select'>$value</span></label></li>";
 			}
 			
@@ -111,6 +133,36 @@ class InputfieldCheckboxes extends InputfieldSelectMultiple implements Inputfiel
 
 	}
 
+	/**
+	 * Get CSS width and unit for option width
+	 * 
+	 * @param string|int $optionWidth
+	 * @param array $options
+	 * @return string
+	 * 
+	 */
+	public function getOptionWidthCSS($optionWidth, array &$options) {
+		if(!$optionWidth) return '';
+		if(!preg_match('/^(\d+)\s*([a-z]{1,4}|%|);?$/i', $optionWidth, $matches)) return '';
+		$unit = empty($matches[2]) ? 'px' : $matches[2];
+		$optionWidth = $matches[1] . $unit;
+		if($optionWidth === '1px') { // 1 or 1px means "calculate at runtime"
+			$optionWidth = 10;
+			foreach($options as $label) {
+				if(strlen($label) > $optionWidth) $optionWidth = strlen($label);
+			}
+			if($optionWidth > 20) {
+				// use without adjustment
+			} else if($optionWidth > 10) {
+				$optionWidth += 2; 
+			} else {
+				$optionWidth = 10; // minimum option width
+			}
+			$optionWidth .= 'ch';
+		}
+		return $optionWidth;
+	}
+
 	public function set($key, $value) {
 		if($key == 'optionColumns') {
 			$value = (int) $value;
@@ -121,14 +173,34 @@ class InputfieldCheckboxes extends InputfieldSelectMultiple implements Inputfiel
 	}
 
 	public function ___getConfigInputfields() {
-		$inputfields = parent::___getConfigInputfields(); 
+		$modules = $this->wire()->modules;
+		$inputfields = parent::___getConfigInputfields();
+		
 		/** @var InputfieldInteger $f */
-		$f = $this->wire('modules')->get('InputfieldInteger');
-		$f->label = $this->_('Columns of Checkboxes');
-		$f->description = $this->_('If you want the checkboxes to display in columns (rather than stacked), enter the number of columns you want to use (up to 10). To display checkboxes side-by-side (inline) enter 1.'); 
+		$f = $modules->get('InputfieldText');
+		$f->label = $this->_('Option column width');
+		$f->description = 
+			$this->_('Use this setting to have options display in fixed width columns that float or collapse according to viewport width.') . ' ' . 
+			$this->_('Enter a CSS width number and unit such as `100px` or `10em`, for example. If no unit is specified, `px` (pixels) is assumed.') . ' ' . 
+			$this->_('Enter the number `1` to automatically calculate an appropriate width at runtime.'); 
+		$f->notes = $this->_('For best appearance, enter a width that can fit the longest option without word wrapping, or enter `1` to for auto width.');
+		$f->attr('name', 'optionWidth');
+		$f->attr('value', $this->optionWidth);
+		if(!$this->optionWidth) $f->collapsed = Inputfield::collapsedYes;
+		$inputfields->add($f);
+
+		/** @var InputfieldInteger $f */
+		$f = $modules->get('InputfieldInteger');
+		$f->label = $this->_('Option column quantity');
+		$f->description = 
+			$this->_('If you want the options to display in columns, enter the number of columns you want to use (up to 10).') . ' ' . 
+			$this->_('To display options inline side-by-side enter the number `1`.');
+		$f->notes = $this->_('Note that the “option column width” setting is preferable for responsive behavior.'); 
 		$f->attr('name', 'optionColumns'); 
 		$f->attr('value', (int) $this->optionColumns); 
-		$inputfields->add($f);	
+		if(!$this->optionColumns) $f->collapsed = Inputfield::collapsedYes;
+		$inputfields->add($f);
+
 		return $inputfields; 
 	}
 
diff --git a/wire/modules/Inputfield/InputfieldRadios/InputfieldRadios.css b/wire/modules/Inputfield/InputfieldRadios/InputfieldRadios.css
index 14c03803..eb039e84 100644
--- a/wire/modules/Inputfield/InputfieldRadios/InputfieldRadios.css
+++ b/wire/modules/Inputfield/InputfieldRadios/InputfieldRadios.css
@@ -39,3 +39,8 @@
 	padding-bottom: 1%; 
 }
 
+.Inputfields .InputfieldRadiosWidth li {
+	display: inline-block;
+}
+
+
diff --git a/wire/modules/Inputfield/InputfieldRadios/InputfieldRadios.module b/wire/modules/Inputfield/InputfieldRadios/InputfieldRadios.module
index 80e50344..22a0ccde 100644
--- a/wire/modules/Inputfield/InputfieldRadios/InputfieldRadios.module
+++ b/wire/modules/Inputfield/InputfieldRadios/InputfieldRadios.module
@@ -3,10 +3,11 @@
 /**
  * ProcessWire Radios Inputfield
  * 
- * ProcessWire 3.x, Copyright 2016 by Ryan Cramer
+ * ProcessWire 3.x, Copyright 2021 by Ryan Cramer
  * https://processwire.com
  * 
  * @property int $optionColumns Number of columns to display radios in, or 0 for vertical stacked, or 1 for inline (default=0)
+ * @property string $optionWidth Alternative to optionColumns, specify option width like '222px', '22em', etc. or '1' for auto. 3.0.184+
  * 
  */
 
@@ -16,26 +17,27 @@ class InputfieldRadios extends InputfieldSelect {
 		return array(
 			'title' => __('Radio Buttons', __FILE__), // Module Title
 			'summary' => __('Radio buttons for selection of a single item', __FILE__), // Module Summary
-			'version' => 105,
+			'version' => 106,
 			'permanent' => true, 
-			);
+		);
 	}
 
 	public function init() {
-		$this->set('optionColumns', 0); 
+		$this->set('optionColumns', 0);
+		$this->set('optionWidth', ''); 
 		parent::init();
 	}
 
 	public function ___render() {	
 	
-		/** @var Sanitizer $sanitizer */
-		$sanitizer = $this->wire('sanitizer');
+		$sanitizer = $this->wire()->sanitizer;
 
 		$defaults = array(
 			'wbr' => true, 
 			'noSelectLabels' => true,
 		);
-		$settings = $this->wire('config')->get('InputfieldRadios');
+		
+		$settings = $this->wire()->config->get('InputfieldRadios');
 		$settings = is_array($settings) ? array_merge($defaults, $settings) : $defaults;
 		
 		$this->checkDefaultValue();
@@ -43,9 +45,14 @@ class InputfieldRadios extends InputfieldSelect {
 		$columns = (int) $this->optionColumns;
 		if($columns === 1) $inline = true; 
 		$options = $this->getOptions();
+		$optionWidth = $this->getOptionWidthCSS($this->optionWidth, $options);
 		$liAttr = '';
 
-		if($columns) {
+		if($optionWidth) {
+			$liAttr = " style='width:$optionWidth'";
+			$out = "<ul class='InputfieldRadiosWidth'>"; 
+
+		} else if($columns) {
 			if(count($options) >= $columns && !$inline) {
 				$liWidth = round(100 / $columns)-1;  // 1% padding-right added from stylesheet
 				$liAttr = " style='width: {$liWidth}%;'";
@@ -116,17 +123,33 @@ class InputfieldRadios extends InputfieldSelect {
 		}
 		return parent::set($key, $value); 
 	}
+	
+	/**
+	 * Get CSS width and unit for option width
+	 *
+	 * @param string|int $optionWidth
+	 * @param array $options
+	 * @return string
+	 *
+	 */
+	public function getOptionWidthCSS($optionWidth, array &$options) {
+		if(!$optionWidth) return '';
+		/** @var InputfieldCheckboxes $f */
+		$f = $this->wire()->modules->getModule('InputfieldCheckboxes', array('noInit' => true));
+		return $f->getOptionWidthCSS($optionWidth, $options);
+	}
 
 	public function ___getConfigInputfields() {
 		$inputfields = parent::___getConfigInputfields(); 
-		/** @var InputfieldInteger $f */
-		$f = $this->wire('modules')->get('InputfieldInteger');
-		$f->label = $this->_('Columns of Radio Buttons');
-		$f->description = $this->_('If you want the radio buttons to display in columns (rather than stacked), enter the number of columns you want to use (up to 10). To display buttons side-by-side (inline) enter 1.'); 
-		$f->notes = $this->_('If no number is specified here, then each radio button will display on its own line.'); 
-		$f->attr('name', 'optionColumns'); 
-		$f->attr('value', (int) $this->optionColumns); 
-		$inputfields->add($f);	
+		/** @var InputfieldCheckboxes $module */
+		$module = $this->wire()->modules->getModule('InputfieldCheckboxes', array('noInit' => true));
+		$fs = $module->___getConfigInputfields();
+		foreach(array('optionWidth', 'optionColumns') as $name) {
+			$f = $fs->getChildByName($name);
+			$f->val($this->getSetting($name));
+			if($f->val()) $f->collapsed = Inputfield::collapsedNo;	
+			$inputfields->add($f);
+		}
 		return $inputfields; 
 	}