<calcform>
<form class="ajax" data-id="9">
  <input type="hidden" name="bdrms" value="{opt.bdr}">
  <input type="hidden" name="rooms" value="{opt.rooms}">
  <ul class="calc__list" id="calc-form">
    <li class="calc__item ">
      <div class="calc-counter-block ">
        <div class="calc-counter-btn left">
          <i class="fa fa-minus" onclick="{Minus}" data-name="rooms"></i>
        </div>
        <div class="calc-value"> <span>{opt.rooms} {suf.rooms}</span> </div>
        <div class="calc-counter-btn right">
          <i class="fa fa-plus" onclick="{Plus}" data-name="rooms"></i>
        </div>
      </div>
    </li>
    <li class="calc__item ">
      <div class="calc-counter-block">
        <div class="calc-counter-btn left">
          <i class="fa fa-minus" onclick="{Minus}" data-name="bdr"></i>
        </div>
        <div class="calc-value"> <span>{opt.bdr} {suf.bdr}</span> </div>
        <div class="calc-counter-btn right">
          <i class="fa fa-plus" onclick="{Plus}" data-name="bdr"></i>
        </div>
      </div>
    </li>
    <li class="calc__item ">
      <div class="calc-counter-block">
        <div class="calc-counter-btn left">
          <span>+7</span>
        </div>
        <input class="calc-value js-phone" name="phone" placeholder="(XXX) XXX-XX-XX">
      </div>
    </li>
    <li class="calc__item">
      <button class="button yellow button--rayen calc-button" type="submit" onclick="console.log('send', 'event', 'Заказать услугу', 'Страница', 'Шапка');">
        <span class="">Заказать услугу</span>
      </button>
    </li>
  </ul>
  <form>
  <script>
      this.suffix={
        rooms:['комната','комнаты','комнат'],
        bdr:['санузел','санузла','санузлов'],
      };
      this.suf={rooms:this.suffix.rooms[0],bdr:this.suffix.bdr[0]}
      this.opt={rooms:1,bdr:1};
      
      this.Sint=function(o){
        if(this.opt[o]==1)
            this.suf[o]=this.suffix[o][0];
        if(this.opt[o]>1)
             this.suf[o]=this.suffix[o][1];  
        if(this.opt[o]>4)
             this.suf[o]=this.suffix[o][2];     
      }

      this.Plus=function(e){ 
        var name=$(e.target).data('name');
        this.opt[name]++;
        this.Sint(name);

      }.bind(this);
      
      this.Minus=function(e){
        var name=$(e.target).data('name');
        if(this.opt[name]==1) return;
        this.opt[name]--;
        this.Sint(name);
      }.bind(this);


  </script>
</calcform>  