April 20, 2026

IB Grade Boundaries Explained: How Your Final Score Is Actually Calculated

Time is your most limited resource in IB — and the one students waste most. Here's how to manage it like a pro.

IB Grade Boundaries Explained: How Your Final Score Is Actually Calculated

Understanding IB grade boundaries gives you a strategic advantage most students don't have. Here's how the system really works.

What Are Grade Boundaries?

Grade boundaries are the minimum raw marks needed for each grade (1-7), set after each exam session based on paper difficulty and global student performance.

Typical Chemistry HL boundaries: 7 = 76%, 6 = 64%, 5 = 52%, 4 = 38%. But these shift every year.

How Your Score Is Calculated

  1. Raw marks from each paper
  2. Weighting applied (Paper 1: 20%, Paper 2: 40%, etc.)
  3. Grade boundaries applied to weighted total
  4. Final grade (1-7) assigned

Strategic Takeaways

  • You don't need 90% for a 7 — boundaries typically fall at 70-80%
  • Every mark counts equally — easy marks are worth the same as hard ones
  • IA is your secret weapon — high IA scores give you exam buffers
  • Know your gap — if you need 6 more marks for a 6, that's specific and fixable

Common Misconceptions

  • The IB doesn't "curve" — boundaries are based on difficulty, not rank
  • Boundaries shift 5-10 marks between sessions
  • Different subjects require different percentages for the same grade

✅ Recover Smarter with StudyIB

📲 Use StudyIB to keep improving with a structured study plan.

💬 Get support from other IB students on Discord

‍