IB Physics IA Grader

Grade your Physics IA before you submit. Upload your draft and get a mark for each criterion, comments tied to your sentences, and a list of what to fix first.

Grade my IASee what you get

5 free gradings a month. No card. Private to you.

Physics IA mark and criterion feedback in Marksy
of marks within one grade of the IB's final mark
92%
marking score. ChatGPT 65, Claude 61, Gemini 57
74/100
real IAs and TOK essays tested against the mark the IB gave
1,317
See how we testedMarksy vs ChatGPT, Claude and Gemini
Marks
24, from four criteria worth 6 each
Length
3,000 words at most
Share of your grade
20%, at SL and HL
SL and HL
Same task, same criteria

See the mark, and the sentences behind it

Check the quality of your method, analysis, evaluation, communication and subject-specific reasoning. Find the weakest parts of the draft and see what to change first.

Physics IA: comments on your writing
Comments on your writingEach comment points at a passage in your draft, so you can see why Marksy said it.
Physics IA: what to fix first
What to fix firstA short list of edits in order, instead of changing random parts of the draft.

What Marksy checks for each Physics IA criterion

You get a mark for each IB assessment criterion below. The points under each one are what Marksy looks for in your draft. See the mark bands

Criterion A: Research Design

6 marks
  • The research question is focused and placed in a specific scientific context.
  • Method choices (variables, controls, range, repeats, data sufficiency) are explained, not just listed.
  • The procedure has enough detail for another student to reproduce it.

Criterion B: Data Analysis

6 marks
  • Raw and processed data are traceable, with units and uncertainties.
  • Calculations, graphs, and any statistics are correct and fit the research question.
  • Uncertainties are propagated or discussed where they matter.

Criterion C: Conclusion

6 marks
  • The answer to the research question is explicit and backed by your processed data.
  • The claim is no stronger than the evidence allows.
  • The result is compared with published values, theory, or other studies.

Criterion D: Evaluation

6 marks
  • Weaknesses are specific to this investigation, not generic.
  • The report explains how much each weakness affected the results.
  • Improvements are realistic and target the weaknesses you identified.

Where Physics IAs usually lose marks

Marksy flags these in your draft and links each one to the sentences it is about.

  • Too few values of the independent variableAim for at least five values, ideally more, over a wide range, with repeats. Otherwise there is no real trend to test.Criterion A
  • A method that hides the measurementSay exactly how you measured each quantity: the instrument, its resolution, and how you reduced reaction time or parallax.Criterion A
  • Curves left as curvesIf theory predicts y ∝ x², plot y against x². A straight line lets you test the relationship and use the gradient.Criterion B
  • Error bars but no gradient uncertaintyUse steepest and shallowest lines (or your software) to find the uncertainty in the gradient, then in the value you work out from it.Criterion B
  • Not comparing with theorySay whether the accepted value falls inside your uncertainty range. If it doesn't, explain why instead of hiding it.Criterion C
  • Weaknesses with no sizeSay which uncertainty was largest and how much it affected your final value. Then suggest a fix that reduces that one.Criterion D

Before you upload

  • Include your raw data tables, not only the processed graphs.
  • Keep units and uncertainties in the table headings.
  • Show one full worked example of each calculation.
  • If you used a database or simulation, say where the data came from.

Your draft stays at the centre

Marksy reads the work you upload, points each comment back to your writing, and puts the most important changes first.

Can your experiment isolate the physical relationship you want to test?
Read Physics IA Planning Guide
  1. 1

    Upload your draft

    A PDF of your Physics IA, finished or not. Every comment stays connected to your own writing.

  2. 2

    Read the comments

    Highlights show which passage each comment is about.

  3. 3

    Fix the important parts first

    Work down a short list instead of making scattered edits.

  4. 4

    Keep the final say

    Accept, adapt or ignore each suggestion. You stay the author.

What students wrote afterwards

From Trustpilot, as written.

marksyib has saved my ib diploma. thanks to it, my IA's were perfect and got the points i needed. really recommended.
maya balog, 13 February 2026
Marksy ib allowed me to be able to finish my IAs much before allowing me to be able to relax better. 100% recommended
Jordi Pasalaigua Peiron, 25 March 2026
Read the reviews on Trustpilot

Your work stays your work

Marksy reads the draft you upload and comments on it. It doesn't rewrite your assessment, and your files are never used to train AI.

Read the safety answers
  • Private to youOnly you can see your work unless you choose to share it.
  • Never used for trainingYour coursework is not added to any AI training data.
  • Feedback, not ghostwritingUse the report to improve your own analysis and decisions.
  • Delete it whenever you wantYou control the files stored in your account.

Questions before you upload

Still planning? The coursework guide covers the criteria and what to ask yourself while you write. Open the guide

Write your gradient, intercept and their uncertainties in the text or a table, not only on the graph. Then both Marksy and your teacher can follow how you got your final value.

Yes. Simulations and databases are allowed and use the same criteria. Explain why your setup is a fair test and where its limits are.

No. SL and HL students do the same scientific investigation and are marked against the same four criteria.

Yes. Up to three students can collect data together, but each of you writes your own Physics report. Upload your own report.

Along with the IB criteria, Marksy's science IA marking uses notes on how real IB-marked reports scored at each mark band. That helps it mark weak and strong reports more like an IB moderator would.

We tested Marksy on 1,317 real IAs and TOK essays with the mark the IB gave them. 92% of Marksy's marks landed within one grade. On a set with as many weak as strong essays, it scored 74/100 on our marking score, against 65 for ChatGPT, 61 for Claude and 57 for Gemini. Every number, and how we tested, is on the grading accuracy page.

Yes. Marksy checks your Physics IA against the IB assessment criteria for it and returns marks, comments and fixes instead of generic essay advice.

Yes. Early drafts are useful because the report can show a weak criterion before you spend hours polishing the wrong section. You can revise and grade another version later.

A free account includes 5 gradings a month. You don't need a card.

No. Marksy reads your existing work, explains each comment, and suggests what to revise. The writing and the final decisions stay yours.

Your upload is private to your account, is not used to train AI models, and can be deleted whenever you want.

Stop guessing what to fix in your Physics IA

Upload the version you have now and find the parts holding it back.

Grade my IA