lifted from https://forum.duolingo.com/comment/2261330/XP-needed-per-level

  • Level 1: 0 → 59 (60 point span)
  • Level 2: 60 → 119 (60 point span)
  • Level 3: 120 → 199 (80 point span)
  • Level 4: 200 → 299 (100 point span)
  • Level 5: 300 → 449 (150 point span)
  • Level 6: 450 → 749 (300 point span)
  • Level 7: 750 → 1,124 (375 point span)
  • Level 8: 1,125 → 1,649 (525 point span)
  • Level 9: 1,650 → 2,249 (600 point span)
  • Level 10: 2,250 → 2,999 (750 point span)
  • Level 11: 3,000 → 3,899 (900 point span)
  • Level 12: 3,900 → 4,899 (1,000 point span)
  • Level 13: 4,900 → 5,999 (1,100 point span)
  • Level 14: 6,000 → 7,499 (1,500 point span)
  • Level 15: 7,500 → 8,999 (1,500 point span)
  • Level 16: 9,000 → 10,499 (1,500 point span)
  • Level 17: 10,500 → 11,999 (1,500 point span)
  • Level 18: 12,000 → 13,499 (1,500 point span)
  • Level 19: 13,500 → 14,999 (1,500 point span)
  • Level 20: 15,000 → 16,999 (2,000 point span)
  • Level 21: 17,000 → 18,999 (2,000 point span)
  • Level 22: 19,000 → 22,499 (3,500 point span)
  • Level 23: 22,500 → 25,999 (3,500 point span)
  • Level 24: 26,000 → 29,999 (4,000 point span)
  • Level 25: 30,000 and up