title: WooCommerce calculate totals
body: <p>I'm trying to display total cart value (including VAT) in the header of my site. However - if I try to use cart->get_cart_total() I get the price excluding VAT. If I try to use cart->get_totals() I get a value of 0 until I visit the cart page - then it shows the correct value (even if I surf to other pages).</p>
  
  <p>Ok, so I tried to run cart->calculate_totals() before fetching the cart->get_totals() but it seems to reset the value... It still works fine on the cart page though.</p>
  
  <p>Could someone please help me here?
  Thanks</p>