Help with js

/*-- Land area in WPUF ---*/
function render_land_area_hook( $form_id, $post_id, $form_settings ) {
    $value1 = '';
    $value2 = '';
    if ( $post_id ) {
        $value1 = get_post_meta( $post_id, 'land_area', true );
    }
    ?>
 <li class="wpuf-el land_area2">  
    <div class="wpuf-label">
        <label>Land Area</label>
    </div>
    <script type="text/javascript">
	  function calc(){
	      //grab the values
	      area_acres = document.getElementById('area_acres').value;
	      document.getElementById('area_m2').value = parseFloat(4046.86 * area_acres).toFixed(0);
	  }
	  function calc_rev(){
	      area_m2 = document.getElementById('area_m2').value;
	      document.getElementById('area_acres').value = parseFloat(area_m2 / 4046.86).toFixed(2);
	  }
    </script>

    <div class="wpuf-fields">
        <input name="land_area_m2" id="area_m2" type="text" onblur="calc_rev()"> m<sup>2</sup> OR  <input name="land_area_acres" id="area_acres" type="text" onblur="calc()"> acres
    </div>

<script type="text/javascript">
            wpuf_conditional_items.push({"condition_status":"yes","cond_field":["steps"],"cond_operator":["="],"cond_option":["1 Basics"],"cond_logic":"any","type":"text","name":"land_area2","form_id":"2422"});
</script>

    <?php
}
add_action( 'land_area_hook', 'render_land_area_hook', 10, 3 );
// update
function update_land_area( $post_id ) {
    if ( isset( $_POST['land_area_m2'] ) ) {
        update_post_meta( $post_id, 'land_area', $_POST['land_area_m2'] );
    }
}
  
add_action( 'wpuf_add_post_after_insert', 'update_land_area' );
add_action( 'wpuf_edit_post_after_update', 'update_land_area' );