Calculate tile size

calc.js

// $ npm install turf tilebelt # dependencies
const turf = require("turf");
const tilebelt = require('tilebelt');

const calc = () => {
  const lon = 10;
  for (let z = 1; z < 31; z++) {
    for (let lat = 0; lat < 90; lat += 10) {
      const [x, y] = tilebelt.pointToTile(lon, lat, z);
      const geometry = tilebelt.tileToGeoJSON([x, y, z]);
      const points = geometry.coordinates[0];

      let side1 = turf.distance(points[0], points[1]);
      let top = turf.distance(points[1], points[2]);
      let side2 = turf.distance(points[2], points[3]);
      let bottom = turf.distance(points[3], points[4]);

      console.log([z, lat, Math.max(bottom, top)].join(","));
    }
  }
};

calc();