UniGeniusIB Biology

IB Biology and Chemistry grade calculator

Subject
Level

The total printed on the paper or mark scheme.

The total printed on the paper or mark scheme.

The total printed on the paper or mark scheme.

Grade boundaries from your school (optional): the lowest weighted % for each grade

IB Biology HL

69.7% weighted

Your marks weight to 69.7% of the final mark.

  • Paper 124% of 36%
  • Paper 229.7% of 44%
  • Scientific investigation16% of 20%

Your result

69.7% weighted. Your marks weight to 69.7% of the final mark. Enter your school's boundaries to read a grade.

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IB Biology and Chemistry weight Paper 1 at 36%, Paper 2 at 44% and the scientific investigation at 20% of the final mark, at SL and HL.

Questions people ask

How much is the IB Biology IA worth?

20% of the final mark at SL and HL. Paper 1 is 36% and Paper 2 44%.

How much is the IB Chemistry IA worth?

20% of the final mark at SL and HL, the same as Biology. Paper 1 is 36% and Paper 2 44%.

Where do I find IB grade boundaries?

The IB sets them after each session and shares them with schools, not openly. Ask your teacher for the boundaries your school uses.

How we work this out

What it does

Enter your marks on each paper and the investigation, then your school's boundaries.

IB Diploma Biology and Chemistry, SL and HL, first assessed in 2025.

Method

  1. Each component's marks are turned into a share of its weighting: Paper 1 36%, Paper 2 44%, the scientific investigation 20%.
  2. The three shares add up to your weighted total out of 100.
  3. If you enter grade boundaries, the grade is the highest one whose boundary your total reaches.