Question 1

How does the payload size calculator work?

Accepted Answer

You can paste a JSON payload or build one using the form. The tool calculates raw size in bytes/KB/MB, then applies compression (gzip ~70% reduction, brotli ~75% reduction) and estimates MessagePack and Protobuf sizes. Bandwidth cost is computed based on daily requests and CDN pricing.

Question 2

What compression ratios are used?

Accepted Answer

Gzip reduces size by approximately 70%, Brotli by 75%. These are realistic averages for JSON payloads.

Question 3

How are MessagePack and Protobuf sizes estimated?

Accepted Answer

MessagePack is estimated as ~80% of JSON size (binary overhead). Protobuf is estimated as ~60% of JSON size (compact schema-based encoding). Actual sizes vary by schema.

📦 Request/Response Size Calculator

📝 Build or paste JSON

📊 Size estimates

📡 Bandwidth cost at scale