The forgetting curve describes how retention changes over time after learning. It is a useful way to ask when material needs another encounter, but it does not tell every student exactly how much of a chapter will disappear in seven days. Your task, initial learning, and later practice affect what a check can show.
To find out what you remember a week after studying, try explaining or applying the material before reopening your notes. Then check your response against a reliable source. A familiar-looking page can make it difficult to tell what you could produce independently.
There is no single percentage from Wizidoo's records that tells you how much every student forgets in seven days. We have early observations, but not a controlled one-week memory study. A useful study plan does not need a dramatic universal number to get started.
## What Ebbinghaus measured, and what a class quiz measures
Ebbinghaus used lists of syllables and examined learning again after a delay. A key measure was savings: how much work relearning saved compared with the initial learning. That is not the same measure as the percentage correct on your biology quiz.
Murre and Dros's 2015 replication studied the forgetting curve under a defined protocol with one participant. It does not establish a loss percentage for all US students. A smooth chart copied from another task cannot tell you how much of your own course you remember.
For a usable check, choose something your instructor expects you to explain or solve. The rest of this guide shows how to inspect that answer and interpret it without turning it into a personal memory score. Our spaced repetition guide covers planning repeat study sessions.
## Try a check that matches your class
Suppose you studied a biology unit last Monday and have a quiz this week. Choose a process your teacher expects you to explain. Draw it or describe it from memory, then compare your work with the course material. Keep the original attempt so you can see which parts you supplied without help.
For algebra, choose an appropriate problem rather than only naming a formula. For a history class, connect evidence to a claim. These tasks reveal different things, so do not turn every subject into the same vocabulary quiz.
Write down which parts you completed independently and which needed a cue. Correct the work afterward. This is a practical study check, not a diagnostic test of your memory or a prediction of your course grade.
What did you do during that week?
A class discussion, homework assignment, or study group may have brought you back to the same material. Those experiences matter when interpreting what you remember. “A week since I first studied it” is different from “a week without encountering it again.”
Keep a simple record of those return visits. Do not avoid useful studying to create a cleaner personal experiment. Your goal is to learn the course, and a brief note about the circumstances is enough for ordinary study planning.
If you regularly reread before trying a question, experiment with reversing that order. Our guide to rereading notes explains why recognition and independent recall can give different impressions of preparation.
The research question and the app-data question
Roediger and Karpicke's 2006 experiments compared learning conditions and delayed tests using prose material. Their findings support retrieval practice for later retention. They do not provide a universal loss percentage for every chapter in every class.
Cepeda and colleagues' 2008 spacing study examined how the gap between learning opportunities relates to later retention. The useful gap depends in part on how long the material must be retained. That is different from claiming that everyone should follow an identical day-by-day schedule.
Both papers provide a reason to examine recall over time. They do not test Wizidoo or certify its effectiveness. For practical organization, see our spaced repetition guide.
Why we are not publishing a “Wizidoo forgetting percentage”
Our October 5, 2026 extraction found 57 repeated-question attempts separated by at least seven days, across only five accounts. The delays were not all exactly one week. Different questions and topics were involved, and studying outside the app was not recorded comprehensively.
Those 57 attempts are not 57 independent students. Some may come from the same person and the same course. A wrong answer can also result from an initial misunderstanding, a reading error, or an ambiguous question rather than forgetting something previously understood.
For these reasons, we will not extrapolate the small group into a claim about US students. We also will not fit a smooth-looking curve and present it as measured retention. The honest conclusion is that more comparable follow-up is needed.
Turn your own check into the next session
Choose a gap that matters for the upcoming assessment. Review the relevant explanation, close it, and try the task again. If the reasoning is still missing, use a worked example or ask your instructor for clarification.
Later, try a related task with different wording or details. A correct repeat of a memorized question and a correct solution to a new problem provide different evidence. You do not have to label the whole chapter “known” or “forgotten” after either one.
If an exam is approaching, combine these checks with the actual scope and format of the assessment. Our exam-readiness guide can help you review those practical requirements.
What a stronger follow-up would need
A future Wizidoo observation would need more participants, a defined interval close to seven days, and a record of intervening study. It should also separate repeat questions from new questions testing a related concept. We have not completed that protocol or assigned it a result in advance.
The current counts were prepared by the Wizidoo team from records filtered to exclude identified internal/test accounts and accounts created before March 17, 2026. Only aggregate counts are discussed. The participants are not established as a representative American sample.
You can use Wizidoo on the web to practice with imported course material and view the results of your activity. Wizidoo is also available on the App Store. Keep your instructor's assignments and feedback alongside the app, because its records cover only work done within the product.
Read the full method and download the aggregate counts. Prepared by the Wizidoo editorial team, October 5, 2026. These exploratory observations are not a controlled effectiveness study.
Reader questions
Should I expect to forget a fixed amount after seven days?
No universal percentage follows from our data. What was learned, how it was practiced, and what happened afterward all need consideration.
Should I wait a full week before reviewing?
No. Seven days is a possible observation point, not an instruction to postpone needed study.
What if I recognize everything when I open my notes?
Close them and try to explain or use the material. Recognition does not answer the same question as independent recall.
Does one missed answer mean I forgot the topic?
No. Examine the specific response and task before drawing a broader conclusion.
Can I reuse the same questions?
You can, but add a related task if you want to check application beyond a familiar answer.
Why not treat 57 attempts as a large sample?
They came from five accounts. Multiple responses from one person do not create additional independent participants.
Were outside study sessions tracked?
Not comprehensively. That is one reason these records cannot isolate forgetting over a week.
Do the cited studies prove Wizidoo works?
No. They investigated learning under their own research conditions, not this product.
Can this approach help with college midterms?
It can help you inspect preparation on selected material. Use tasks consistent with your course requirements and the exam format.
What should a parent take from an app result?
Treat it as information about a particular activity. It is not a complete measure of the child's schoolwork or ability.
