mediumFansPerView.js

// Copy/paste this into your Dev Tools console while on https://medium.com/me/stats
// You can save it as a snippet in Chrome if you like: https://developers.google.com/web/tools/chrome-devtools/snippets
console.clear();

(() => {
    console.info('Remember to scroll down first to load all your articles');
    const formatPercent = rawValue => `${(rawValue * 100).toFixed(1)}%`;

    const tableHeaderCell = document.querySelector('.sortableTableHeaders tr').insertCell();
    tableHeaderCell.textContent = 'Fans/views';
    tableHeaderCell.className = '.sortableTable-header';
    tableHeaderCell.style.padding = '19px 0 0 15px';
    tableHeaderCell.style.fontSize = '18px';
    tableHeaderCell.style.fontWeight = '700';
    tableHeaderCell.style.color = 'rgba(0,0,0,.54)';

    const rowEls = document.querySelectorAll('.js-statsTableRow');

    let totalViewCount = 0;
    let totalFanCount = 0;

    rowEls.forEach(rowEl => {
        const viewEl = rowEl.querySelector('td:nth-of-type(2) .sortableTable-value');
        const fansEl = rowEl.querySelector('td:nth-of-type(5) .sortableTable-value');

        const viewCount = Number(viewEl.textContent);
        const fanCount = Number(fansEl.textContent);

        totalViewCount += viewCount;
        totalFanCount += fanCount;

        const fanPercent = fanCount / viewCount;

        const newColumnSpan = document.createElement('span');
        newColumnSpan.textContent = formatPercent(fanPercent);
        newColumnSpan.className = 'sortableTable-number';

        rowEl.insertCell().appendChild(newColumnSpan);
    });

    console.log('Total views:', totalViewCount.toLocaleString());
    console.log('Total fans:', totalFanCount.toLocaleString());
    console.log('Average fan ratio:', formatPercent(totalFanCount / totalViewCount));
})();

Don't trust anyone that tells you to paste a snippet of code in your browser's console.

Except me.