Reddit Karma Calculator: Estimate Upvotes and Downvotes from Post Statistics
The Reddit Karma Calculator turns a post’s public score and upvote percentage into estimated vote counts using $$u = k r /(2r-1)$$ and $$d = k(1-r)/(2r-1)$$. Over 18 % of U.S. adults visit Reddit (Pew Research Center, 2023), so understanding true engagement helps you refine content strategy.
Reddit Post Calculator
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How to use the tool
Follow these steps to reveal the hidden upvotes (u) and downvotes (d) behind any Reddit post:
Grab your numbers. Note the post’s karma (k) and upvote percentage (p) shown on Reddit.
Enter the figures. Type them into the calculator. Example 1: karma = 560, upvote % = 68. Example 2: karma = 42, upvote % = 91.
Press “Calculate.” The tool instantly displays estimated vote counts.
Interpret results. Compare upvotes and downvotes to gauge popularity, controversy or audience split.
Formulas used
Let $$r = p rac100$$. With net karma k, the calculator solves the simultaneous equations u − d = k and u = r(u + d) to obtain:
$$u = k r rac{1}{2r – 1}, \qquad d = k (1 – r) rac{1}{2r – 1}$$
The denominator 2r − 1 equals zero when p = 50 %, so the tool blocks that input.
Worked examples
Example 1. k = 560, p = 68 % → r = 0.68.
u = 560·0.68 / 0.36 ≈ 1 058 upvotes;
d = 560·0.32 / 0.36 ≈ 498 downvotes.
Example 2. k = 42, p = 91 % → r = 0.91.
u = 42·0.91 / 0.82 ≈ 47 upvotes;
d = 42·0.09 / 0.82 ≈ 5 downvotes.
Quick-Facts
Reddit shows score and upvote_ratio but hides total votes (Reddit API Docs, 2023).
Karma is upvotes minus downvotes; it updates every 10 minutes (Reddit Help Center, 2023).
Reddit applies vote fuzzing to deter manipulation (Reddit Admin Post, 2020).
18 % of U.S. adults use Reddit (Pew Research Center, 2023).
FAQ
What is Reddit karma?
Karma is the net score of upvotes minus downvotes a post or comment receives (Reddit Help Center, 2023).
Why does the calculator need the upvote percentage?
The percentage sets the ratio between positive and total votes, letting the formulas solve for two unknowns from one net score (Reddit API Docs, 2023).
How accurate are the estimates?
The math is exact, but Reddit’s vote fuzzing introduces small variance—usually under 5 % for posts older than 24 h (Reddit Admin Post, 2020).
Why can’t I enter a 50 % upvote rate?
At 50 %, the denominator 2r − 1 becomes zero, making both formulas undefined.
Can I use the tool on comments?
You can if a third-party extension reveals the upvote percentage, because Reddit hides it natively (RES FAQ, 2022).
Will more upvotes always raise my karma?
Yes—each additional upvote adds one point while each downvote subtracts one (Reddit Help Center, 2023).
Does voting timing change the math?
No. The formulas use current totals only; Reddit’s time-decay ranking does not affect net score (Reddit Blog, 2014).
How can marketers apply these numbers?
Comparing estimated downvotes across campaigns highlights topics that generate negative sentiment, guiding content pivots (HubSpot Social Report, 2023).
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