IB Physics IA Grader — Free AI Feedback on Your Lab Report

IBLens grades your IB Physics Internal Assessment against the official IB Physics IA rubric — criterion by criterion — in 60 seconds. Get feedback on your exploration, data analysis, uncertainty propagation, and evaluation. A free preview is included; the full report is $4.99.

IB Physics IA rubric (24 marks)

The Physics IA uses the current (first assessment 2025) scientific investigation rubric: four criteria worth 6 marks each, identical at SL and HL, with a 3,000-word maximum.

• Research design (6 marks): A focused, measurable research question set in a scientific context; clearly identified variables; a sound, safe experimental design.
• Data analysis (6 marks): Correct data presentation with appropriate significant figures, uncertainty analysis, and linearisation of graphs where required.
• Conclusion (6 marks): A conclusion justified by the analysis, answering the research question and compared to accepted theoretical or literature values.
• Evaluation (6 marks): Critical evaluation of your method and results, and specific, realistic improvements.

Common IB Physics IA mistakes IBLens catches

• Linearisation not attempted: For non-linear relationships (e.g., period vs length), Physics examiners expect you to linearise your graph (e.g., T² vs L). Not doing this limits your Analysis score.
• Percentage error vs percentage uncertainty: Confusing percentage error (deviation from theory) with percentage uncertainty (precision of measurement). These are different calculations serving different purposes.
• No comparison to literature value: Your Evaluation section should compare your experimental value to a known theoretical or literature value and calculate the percentage error.
• Research question too qualitative: "How does temperature affect resistance?" needs to specify the range and units: "How does temperature (20°C–80°C) affect the resistance (Ω) of a nichrome wire?"

Frequently asked questions

Is the Physics IA grader free?

Every essay gets a free preview (band range, weakest criterion, top risks). The full report is $4.99.

Can I paste only part of my IA?

Yes — but for criterion-by-criterion feedback, paste your full report for the most accurate score prediction.