System Design Estimator
Calculate QPS, storage, and bandwidth for system design interviews
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📊 User Base
Monthly Active Users (MAU)
users
Daily Active %
% of MAU
Peak Multiplier
× average QPS
📥 Read Requests (GET)
Include read operations
Reads per User per Day
requests/user/day
Avg Response Size
KB per response
📤 Write Requests (POST)
Include write operations
Writes per User per Day
requests/user/day
Avg Payload Size
KB per request
🖼️ Media Storage
Include media storage calculations
% of Writes with Media
% of POST requests
Avg Media Size
MB per media item
Retention Period
years
📈 Results
Daily Active Users
DAU
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Queries Per Second (QPS)
Read QPS (GET)
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Write QPS (POST)
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Total QPS
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Peak QPS
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Bandwidth
Read Bandwidth
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Write Bandwidth
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Media Storage
Daily Media Storage
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Total Storage
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