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Calcimator

JSON Size Calculator

Estimate JSON payload size based on key count, value lengths, nesting depth, and array size. See minified and gzipped estimates.

Inputs

chars
chars

Results

Estimated Size

1.48 KB

Total Characters1,520
Minified Size1,064 chars
Gzipped Estimate~456 bytes
Objects per 1MB~690 per 1MB payload
How to Use This Calculator
  1. Enter the number of Keys Per Object in your JSON structure (e.g., 10 for a typical API response object).
  2. Set the average key length in characters (e.g., 8 for names like 'username') and the average value length (e.g., 15).
  3. Enter the Nesting Depth for nested objects — 0 is flat, 2–3 is typical for REST APIs.
  4. Set the Array Size if your payload contains repeated objects (e.g., 100 items in a list).
  5. Review Estimated Size, Minified Size, and Gzipped Estimate to plan API payloads and bandwidth budgets.
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