Docker Memory Limit Calculator — Model Limits, Swap & OOM Protection
Calculate appropriate container memory limits based on JVM or Node.js heap settings and OS overhead
How to Use Docker Memory Limit Calculator — Model Limits, Swap & OOM Protection
How to Use the Docker Memory Limit Calculator
Step 1: Choose Your Runtime
Select JVM (Java/Kotlin/Scala) or Node.js.
Step 2: Enter Your Heap Size
Enter the heap value you already configure — -Xmx for JVM, or --max-old-space-size for Node.js — in megabytes.
Step 3: Adjust the Overhead Factor
The default overhead percentage (25% for JVM, 50% for Node.js) accounts for memory outside the managed heap: metaspace, code cache, and thread stacks for JVM; other V8 memory spaces and native Buffers for Node.js. Increase it if your workload uses many threads, native modules, or off-heap caches.
Step 4: Review the Recommended Limit
The tool shows a breakdown (heap, non-heap base, safety margin) and a recommended container memory limit, rounded up to a clean value.
Step 5: Copy the Snippets
Copy the generated docker-compose.yml block (mem_limit / mem_reservation) or Kubernetes manifest (resources.requests.memory / resources.limits.memory) directly into your deployment configuration.
Frequently Asked Questions
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