SVG center text in circle

Add text-anchor="middle" to the text element.

Plunker

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" style="shape-rendering:geometricPrecision; text-rendering:geometricPrecision; image-rendering:optimizeQuality; fill-rule:evenodd; clip-rule:evenodd"
viewBox="0 0 500 500">
  <g id="UrTavla">
    <circle style="fill:url(#toning);stroke:#010101;stroke-width:1.6871;stroke-miterlimit:10;" cx="250" cy="250" r="245">
    </circle>
    <text x="50%" y="50%" text-anchor="middle" stroke="#51c5cf" stroke-width="2px" dy=".3em">Look, I’m centered!Look, I’m centered!</text>
  </g>
</svg>

The solution proposed and accepted is INVALID when you want to draw a circle that is not centered on container !

Using x="50%" y="50%" on text tag works only when SVG element contains a circle that is centered on viewPort.

If you want to draw 3 circles, you must also change (x,y) text coordinates so that they are equal to (cx,cy) circle coordinates has done in following example

As proposed by random, I have added alignment-baseline="middle" for first circle in code snippet only so you can see that for Label text is now perfectly aligned (vertically).

<svg height="350" width="350">
    <circle cx="110" cy="110" r="100"
            stroke="red"
            stroke-width="3"
            fill="none"
            />
    <text x="110" y="110" 
          text-anchor="middle"
          stroke="red"
          stroke-width="1px"
          alignment-baseline="middle"
          > Label
    </text>
    <circle cx="240" cy="110" r="100" 
            stroke="blue" 
            stroke-width="3"
            fill="none"
            />
    <text x="240" y="110" 
          text-anchor="middle" 
          stroke="blue" 
          stroke-width="1px"
          > Ticket
    </text>
    <circle cx="170" cy="240" r="100" 
            stroke="green" 
            stroke-width="3" 
            fill="none"
            />
    <text x="170" y="240" 
          text-anchor="middle" 
          stroke="green" 
          stroke-width="1px"
          > Vecto
    </text>
</svg>

Just for the fun, I have put code with 3 circles to select each parts. Just click on it !

    function setReadableCode()
        {
        var circLabel = document.getElementById('circLabel');
        var circTicket = document.getElementById('circTicket');
        var circVecto = document.getElementById('circVecto');
        var interLabelTicket = document.getElementById('interLabelTicket');
        var interTicketVecto = document.getElementById('interTicketVecto');
        var interVectoLabel = document.getElementById('interVectoLabel');
        var interLabelTicketVecto = document.getElementById('interLabelTicketVecto');
        }

    function clickCircle(sCircle, sInter2a, sInter2b, sInter3)
        {
        var circ = document.getElementById(sCircle);
        var inter2a = document.getElementById(sInter2a);
        var inter2b = document.getElementById(sInter2b);
        var inter3 = document.getElementById(sInter3);

        var sColor = '';

        if (circ.style.fill == '' || circ.style.fill == 'white')
            {
            sColor = 'yellow';
            }
        else
            {
            sColor = 'white';
            }

        circ.style.fill = sColor;
        inter2a.style.fill = sColor;
        inter2b.style.fill = sColor;
        inter3.style.fill = sColor;

        setReadableCode();
        }

                    function clickCircLabel() {
                        clickCircle('circLabel', 'interLabelTicket', 'interVectoLabel', 'interLabelTicketVecto');
                    }

                    function clickCircTicket() {
                        clickCircle('circTicket', 'interLabelTicket', 'interTicketVecto', 'interLabelTicketVecto');
                    }

                    function clickCircVecto() {
                        clickCircle('circVecto', 'interVectoLabel', 'interTicketVecto', 'interLabelTicketVecto');
                    }

                    function clickIntersection2(sInter2, sInter3) {
                        var inter2 = document.getElementById(sInter2);
                        var inter3 = document.getElementById(sInter3);
                        var sColor = '';

                        if (inter2.style.fill == '' || inter2.style.fill == 'white') {
                            sColor = 'yellow';
                        }
                        else {
                            sColor = 'white';
                        }

                        inter2.style.fill = sColor;
                        inter3.style.fill = sColor;

                        setReadableCode();
                    }

                    function clickInterLabelTicket() {
                        clickIntersection2('interLabelTicket', 'interLabelTicketVecto');
                    }

                    function clickInterTicketVecto() {
                        clickIntersection2('interTicketVecto', 'interLabelTicketVecto');
                    }

                    function clickInterVectoLabel() {
                        clickIntersection2('interVectoLabel', 'interLabelTicketVecto');
                    }

                    function clickInterLabelTicketVecto() {
                        var inter = document.getElementById('interLabelTicketVecto');
                        var sColor = '';

                        if (inter.style.fill == '' || inter.style.fill == 'white') {
                            sColor = 'yellow';
                        }
                        else {
                            sColor = 'white';
                        }

                        inter.style.fill = sColor;
                        setReadableCode();
                    }

text 
    {
    font-family:Arial;
    }

<svg height="350" width="350">
<circle id="circLabel" cx="110" cy="110" r="100" stroke="red" stroke-width="0" fill="white" onclick="clickCircLabel();"/>
<text x="60" y="110" text-anchor="middle" stroke="red" stroke-width="1px" onclick="clickCircLabel();">Label</text>
<circle id="circTicket" cx="210" cy="110" r="100" stroke="blue" stroke-width="0" fill="yellow" onclick="clickCircTicket();"/>
<text x="260" y="110" text-anchor="middle" stroke="blue" stroke-width="1px" onclick="clickCircTicket();">Ticket</text>
<circle id="circVecto" cx="160" cy="196.602541" r="100" stroke="green" stroke-width="0" fill="white" onclick="clickCircVecto();" />
<text x="160" y="240" text-anchor="middle" stroke="green" stroke-width="1px" onclick="clickCircVecto();">Vecto</text>
<path id="interLabelTicket"
      d="M 160 23.397460 a100,100 0 0,0 0,173.205081 a100,100 0 0,0 0,-173.205081 z"
      fill="white"
      stroke-width="3"
      onclick="clickInterLabelTicket();"
      />

<path id="interVectoLabel"
      d="M 60 196.602541 a100,100 0 0,0 150,-86.602540 a100,100 0 0,0 -150,86.602540 z"
      fill="white"
      stroke-width="3"
      onclick="clickInterVectoLabel();"
      />

<path id="interTicketVecto"
      d="M 260 196.602541 a100,100 0 0,0 -150,-86.602540 a100,100 0 0,0 150,86.602540 z"
      fill="white"
      stroke-width="3"
      onclick="clickInterTicketVecto();"
      />

<path id="interLabelTicketVecto"
      d="M 110 110 a100,100 0 0,1 100,0 a100,100 0 0,1 -50,86.602540 a100,100 0 0,1 -50,-86.602540 z"
      fill="none"
      stroke-width="3"
      onclick="clickInterLabelTicketVecto();"
      />

<circle cx="110" cy="110" r="100" stroke="red" stroke-width="3" fill="none" />
<circle cx="210" cy="110" r="100" stroke="blue" stroke-width="3" fill="none" />
<circle cx="160" cy="196.602541" r="100" stroke="green" stroke-width="3" fill="none"/>

</svg>

Maybe, could be useful also alignment-baseline="middle", with text-anchor="middle":

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" style="shape-rendering:geometricPrecision; text-rendering:geometricPrecision; image-rendering:optimizeQuality; fill-rule:evenodd; clip-rule:evenodd" viewBox="0 0 500 500">

  <g id="UrTavla">
      <circle style="fill:url(#toning);stroke:#010101;stroke-width:1.6871;stroke-miterlimit:10;" cx="250" cy="250" r="245" /> <!--self-closing tag-->

      <text x="50%" y="50%" stroke="#51c5cf" stroke-width="2px" dy=".3em" text-anchor="middle" alignment-baseline="middle"> Look, I’m centered!Look, I’m centered! </text>
  </g>
</svg>

Here a good resource: http://apike.ca/prog_svg_text_style.html

Cheers

A simpler solution that works with non-centered circles is to put circles and texts inside translated groups.

That way you don't need to repeat the coordinates on the text.

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Centered texts</title>
  </head>

  <body ng-controller="MainCtrl">
    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 500 500">
      <g transform="translate(300, 300)" >
        <circle fill="none" stroke="black" stroke-width="1px" r="120"/>
        <text stroke="blue" stroke-width="1px" text-anchor="middle" alignment-baseline="central">Look, I’m centered!</text>
      </g>
      
      <g transform="translate(150, 150)" >
        <circle fill="none" stroke="black" stroke-width="1px" r="120"/>
        <text stroke="blue" stroke-width="1px" text-anchor="middle" alignment-baseline="central">Look, I’m also centered!</text>
      </g>
    </svg>
  </body>
</html>

The behaviors are not consistent across browsers using alignment-baseline="central". Notably, Chrome will position correctly but Firefox will not. If you use dominant-baseline="central" it will appear correctly in both.

      <svg viewBox="0 0 500 500" role="img" xmlns="http://www.w3.org/2000/svg">
        <g id="myid">
        <circle stroke="darkgray" stroke-width="1px" fill="lightgray"  cx="250" cy="250" r="245"/>
        <text style="font: bold 10rem sans-serif;" text-anchor="middle" dominant-baseline="central" x="50%" y="50%">Centered</text> 
        </g>     
      </svg>

SVG center text in circle

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