<form action="tamadami.php" method="post">
<br><input type="text" name="txtSayi1"value='
<?php
if(isset($_POST["btn"])){

$s1=$_POST["txtSayi1"];
$s2 = number_format( (float) $s1, 2, '.', '') . " ₺";
echo $s2;

}
?>'><br>

<input type="submit" name="btn" value="DONUSTUR">
</form>

jquery mask'a bakabilirsin

KENDINE GORE AYARLA

<div class="box has-ribbon">
      <div class="ribbon is-dark">Fiyat</div>
	
	 
	   
 <div class="kdv">	   
 	<div class="field has-addons">
	   
	   <div class="control">
		   
		 <label class="label pt-5">Kur</label>
		   <div class="select">
		   
		   <select name="kur">
			
			   <option value="1" selected>TL</option>
			   <option value="2" >USD</option>
			   <option value="3" >EURO</option>
			   
		   </select>
 		   </div>
		
	   </div>
	   <div class="control">
		<label class="label pt-5">Vergi Hariç</label>
		<input type="text" name="vergih" class="input fiyat hesaplama" value="150.00" autocomplete="off">
		
	   </div>
	   <div class="control">
		<label class="label pt-5">Vergi Dahil</label>
		<input type="text" name="vergid" class="input kdvlitutar" id="kdvlitutar" value="177.00" readonly autocomplete="off">
		
	   </div>
	   
    </div>
	
	<div class="field">
	 
	<div class="control">
	<div class="select">	
	<select name="kdvoran" class="kdvoran hesaplama">
				<option value="18" selected>18</option>	
				<option value="8" >8</option>	
				<option value="0" >0</option>	
    </select>	
		
	</div> 
	</div> 
	 
	</div> 
	 
<input type="hidden" class="kdvtutar" id="kdvtutar" value="">	 
<input class="adet hesaplama" type="hidden" value="1"> 	 
	 
</div>	   
	
</div>

 // kdv hesaplama
     $(document).ready(function () {
 
    $(document).on("keyup", ".hesaplama", calcAll); //
     $(".hesaplama").on("change", calcAll); });
     function calcAll() {
 
    $(".kdv").each(function () {
        var adet = 0;
        var fiyat = 0;
        var kdvoran = 0;

        if (!isNaN(parseFloat($(this).find(".adet").val()))) {
            adet = parseFloat($(this).find(".adet").val());
        }
        if (!isNaN(parseFloat($(this).find(".fiyat").val()))) {
            fiyat = parseFloat($(this).find(".fiyat").val());
        }
        if (!isNaN(parseFloat($(this).find(".kdvoran").val()))) {
            kdvoran = parseFloat($(this).find(".kdvoran").val());
        }
        kdvsiztoplam = adet * fiyat;
        $(this).find(".kdvsiztoplam").val(kdvsiztoplam.toFixed(2));
        kdvtutar = kdvsiztoplam * kdvoran/100;
        $(this).find(".kdvtutar").val(kdvtutar.toFixed(2));
		
        kdvlitutar = kdvsiztoplam + kdvtutar;
        $(this).find(".kdvlitutar").val(kdvlitutar.toFixed(2)); 
	
	}); //
         var toplam = 0;
     $(".hesaplama").each(function () {
          if (!isNaN(this.value) && this.value.length != 0) {
              toplam *= parseFloat(this.value);
          }
               $("#toplam").val(toplam.toFixed(2));
          if (!isNaN($(this).find(".adet"))) {

          } });
     var aratoplam = 0;
     var kdvtoplam = 0;
 
 
     } 
 // kdv hesaplama