Next, choose the “Review” tab at the top, and you’ll find Interval Modifier on the list. Once you’ve determined what you want to set your Interval Modifier to in Anki, click on the gear icon next to your deck.
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How to Change the Interval Modifier in Anki To get to 95% from 85%, you’re going to have to spend 68% more time, or an extra hour, studying your cards every day. So while 5% better doesn’t sound like a big ask, you’re going to end up spending a lot more time than you realize to get that next 5% of retention. This means you’re going to spend 35% (!) more time, or an extra 30 minutes, studying your cards every day. If you decide you would rather have that rate be more like 90%, you are going to set the Interval Modifier to 65% so your cards more often:
Imagine a scenario where you study 90 minutes a day and are able to achieve a retention rate of 85%. Just as the forgetting curve (how forget over time) is non-linear, the relationship between time spent studying and retention rate is also non-linear. Interval Modifier = log(0.85) / log(0.90) = 154% How to Decide on Your Desired Retention Rate If you want to target 85% retention and you’re currently at 90% retention, you would make the following calculation: Interval Modifier = log(desired retention%) / log(current retention%)
The formula to adjust your Interval Modifier is:
Use Retention Rate to Find the Optimal Interval Modifier No need to spend months over-reviewing only to increase your Interval Modifier down the line. Depending on the age of the deck you are optimizing for, you’ll want to consider both “Young” and “Mature” cards.Īnki’s docs recommend not changing the Interval Modifier until you have plenty of Mature cards, but I have found that it’s fine to tweak my settings a little sooner than that. Ignore the blue “Learning” category for now. Your retention rate will be the % of times you answered with a Correct button.That said, if you need to know information better and are satisfied with a 90% rate, that is personal preference.Īnything above 90%, and you are likely repeating cards too frequently. Of course, it helped that I tried very hard to come up with good mnemonics up front that would save me time re-learning the card later down the line. When I was learning Chinese characters, I added 30 new cards to my deck every day and was able to finish my reviews in 30-45 minutes, leaving an hour to focus on new cards. With an 85% retention rate, you can get through a lot of reviews and still continue to learn a fair amount of new words every day. This is based on my personal experience learning Russian as well as attempting to learn 3,000 Chinese Characters in under 4 months. Your retention rate is going to depend on how well you need to know every piece of information,how long you have to study every day, and how difficult your cards are.įor language learning, I recommend a target retention rate of 85%. What Should I Set My Interval Modifier To?Īnki’s docs recommend aiming for a retention rate of 90%. The less often you study, the lower your retention rate will be. Your Interval Modifier essentially trades time/frequency of reviews for retention rate. Your retention percentage will plummet, and review sessions will eventually become very frustrating. When you don’t see review cards frequently enough, you will forget the information before you have a chance to re-engage with it and maintain its memory. If your intervals are too long, you are seeing cards too rarely. I wrote about how I escaped it while learning Chinese here. This is known as something called “Ease Hell” in the Anki community. Plus, you are wasting valuable time that could be used to learn new cards. If you’re seeing the same cards too often, you are lowering desirable difficulty (thus, lowering engagement and memory formation). If your intervals are too small, you are seeing cards too often. The Interval Modifier is a useful tool to adjust your retention percentage, the percentage of review cards that you answer correctly. Interval * Interval Modifier = New Intervalġ0 days * 120% = 12 days (new interval) Why Should I Change My Interval Modifier? Were you to implement that modifier, you would see the card next in 12 days instead of 10. For now, let’s assume you have an Interval Modifier of 120%. Let’s say you have a card where a Good answer will result in you seeing the card in 10 days (interval = 10). You can use this to increase or decrease the default review time for every card. If you are trying to optimize your Anki settings, you should definitely be looking at your Interval Modifier.Īnki’s Interval Modifier takes the normal interval for a card and multiplies it by the interval modifier.
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