How does the Reddit algorithm work?

Reddit's algorithm ranks posts based on a combination of upvote velocity (how quickly a post receives upvotes), the ratio of upvotes to downvotes, the age of the post, and engagement signals like comments. New posts with rapid early engagement get boosted to the top of subreddit feeds and potentially to r/all.

How does Reddit karma work?

Karma is a score that reflects your total upvotes minus downvotes across all posts and comments. It is split into post karma and comment karma. Higher karma gives your account more credibility, but the relationship between upvotes and karma is not 1:1. Reddit applies diminishing returns so a post with 10,000 upvotes does not award 10,000 karma.

What is the best time to post on Reddit?

Generally, early morning US Eastern time (6-9 AM ET) on weekdays sees the highest engagement because posts gain momentum as users in multiple US time zones come online. However, optimal timing varies by subreddit. Niche professional communities may peak during lunch hours, while gaming subreddits peak in the evening.

What is the difference between Hot, Best, New, and Top on Reddit?

Hot ranks posts by recent engagement velocity, favoring newer posts with rapid upvotes. Best uses a confidence-based algorithm that accounts for sample size, so a post with 10 upvotes and 0 downvotes can outrank one with 100 upvotes and 50 downvotes. New shows posts in chronological order. Top ranks by total net upvotes within a time period.

Complete Algorithm Guide

How the Reddit Algorithm Works

Master Reddit's ranking system, understand karma mechanics, and learn the optimal timing strategies to maximize your content's visibility.

Ranking Factors

Karma System

Timing Strategy

Core Mechanics

How Reddit Ranks Content

Reddit's algorithm prioritizes fresh, engaging content. Understanding these factors is key to getting your posts seen.

Vote Score

High

Net upvotes minus downvotes, but with diminishing returns. The first 10 upvotes matter more than the next 100.

Time Decay

Critical

Posts age out quickly. A 12-hour-old post with 500 upvotes ranks lower than a 1-hour-old post with 50. Learn more about time decay.

Velocity

Critical

How quickly a post gains traction in its first hour determines if it surfaces in Hot. Early momentum is everything.

Engagement

Medium

Comments, especially early ones, signal value to the algorithm. Controversial discussions boost visibility.

Simplified Ranking Formula

Score = log(upvotes)+(sign × controversy)−(hours_since_post × decay_rate)

The actual algorithm is more complex, but this captures the core principle: fresh engagement beats old popularity.

Understanding Karma

What Karma Actually Means

Karma is a reputation score, not a currency. It reflects community participation but doesn't directly affect post visibility.

Post Karma

Earned from upvotes on posts you create. Diminishing returns apply—1000 upvotes doesn't equal 1000 karma.

Comment Karma

Earned from comment upvotes. Generally easier to accumulate and valued by many subreddits for participation.

Awarder/Awardee Karma

Earned from giving and receiving awards. Less common but contributes to overall account credibility.

Subreddit Karma Requirements

Many subreddits have minimum karma thresholds to prevent spam:

r/videos10+ karma

r/personalfinanceAccount age + activity

r/startups50+ karma

r/entrepreneurCommunity participation

Karma ≠ Visibility

A common misconception is that high karma accounts get better post placement. This isn't true. Your post's performance depends on:

The quality and relevance of your content
Timing of your post
Early engagement velocity
Subreddit activity levels

Optimal Timing

When to Post for Maximum Reach

Timing can make or break a post. The first hour is critical for gaining the momentum needed to surface in hot rankings.

Day	Best Time	Quality	Why
Monday	9-11 AM EST	Good	Work procrastination peak
Tuesday	8-10 AM EST	Best	Highest weekday engagement
Wednesday	9-11 AM EST	Best	Mid-week browsing peak
Thursday	8-10 AM EST	Good	Solid weekday traffic
Friday	10 AM - 12 PM EST	Medium	Activity drops afternoon
Saturday	10 AM - 1 PM EST	Variable	Depends on subreddit
Sunday	9 AM - 12 PM EST	Good	Evening prep browsing

Know Your Audience's Timezone

Most large subreddits skew US-centric. EST/PST morning times typically perform best for general audiences.

Catch the Morning Scroll

Many users browse Reddit during morning routines. Posts published early have more time to gain momentum.

Avoid Late Night

Posts made late at night EST will age before the next day's traffic arrives, losing valuable early momentum.

Subreddit-Specific Patterns

Niche communities have their own rhythms. Gaming subs peak evenings; professional subs peak work hours.

Sorting Algorithms

Understanding Reddit's Sorting Methods

Each sorting method uses a different algorithm. Understanding them helps you optimize content for where users actually browse.

Hot

The default view. Balances recency with engagement. Best for discovering trending content.

Algorithm

Score decays with time; fresh popular posts rise fast

Strategy

Target this for maximum visibility. Optimize for early engagement.

New

Shows posts in chronological order. Every post starts here before rising or falling.

Algorithm

Pure chronological, no ranking applied

Strategy

Your first hour in New determines if you hit Hot. Early votes matter most.

Rising

Posts gaining momentum but not yet Hot. The proving ground between New and Hot.

Algorithm

Tracks velocity of engagement relative to post age

Strategy

Getting into Rising is the first milestone. Indicates algorithm is noticing.

Top

Highest-scoring posts for a time period. Historical view of best performers.

Algorithm

Pure score ranking within selected timeframe

Strategy

Study Top posts to understand what resonates in a subreddit.

Controversial

Posts with roughly equal upvotes and downvotes. High engagement, divisive content.

Algorithm

Ranks by total votes with near-equal split

Strategy

Can drive visibility but risky. Use cautiously for brand content.

Best

Reddit's confidence-based ranking. Factors in vote count AND percentage positive.

Algorithm

Wilson score interval—accounts for sample size

Strategy

Used in comments. High upvote ratio with decent volume wins.

Myth Busting

Reddit Algorithm Myths Debunked

Separate fact from fiction. These common misconceptions lead to wasted effort and missed opportunities.

"High-karma accounts get better post placement"

Myth

Reality: Karma is a reputation score, not a ranking factor. A new account's great post will outrank a veteran's mediocre one.

"Shadowbans are extremely common"

Mostly Myth

Reality: True shadowbans are rare and usually reserved for spammers. Most 'shadowban' fears are actually AutoMod filters or subreddit-specific rules.

"Deleting poor-performing posts hurts your account"

Myth

Reality: There's no evidence Reddit penalizes accounts for deleting posts. It's a common practice and doesn't affect future post performance.

"The algorithm favors certain accounts or topics"

Myth

Reality: Reddit's algorithm is engagement-based, not content-based. Popular topics get more visibility because they get more engagement, not preferential treatment.

"Posting the same content to multiple subreddits is penalized"

Myth

Reality: Cross-posting is explicitly supported with Reddit's crosspost feature. Manual reposts aren't penalized but may be removed by individual subreddit rules.

"Early downvotes permanently kill a post"

Partially True

Reality: While early downvotes hurt momentum, the algorithm continuously re-evaluates. A post that recovers can still rise—it just needs stronger subsequent engagement.

Expert Implementation

Ready to Put This Knowledge to Work?

Understanding the algorithm is step one. We help brands implement strategies that consistently surface in the right communities at the right time.

Read Best Practices

Or explore more guides: Reddit Advertising Guide · Why Reddit Matters