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Signature Size Calculator

Understand how post-quantum signature sizes will impact your bandwidth, storage, and infrastructure costs.

Coming Q1 2026

The Problem

PQC signatures are larger than classical ECDSA or RSA signatures. ML-DSA-65 signatures are ~3.3KB vs 64 bytes for ECDSA. Before migrating, you need to understand the impact on:

  • Certificate chain transmission (TLS handshakes)
  • Document signing (PDF, email, code)
  • Storage requirements (certificate stores, logs)
  • Network bandwidth (especially for IoT/constrained devices)
ECDSA P-256
64 B
signature
ML-DSA-65
3.3 KB
signature
SLH-DSA-128f
17 KB
signature

What You'll Get

  • Input your monthly signing volumes
  • Compare bandwidth impact across algorithms
  • Storage projections for certificate databases
  • TLS handshake size estimates
  • Export projections as CSV or PDF
  • Share results with stakeholders

Who It's For

  • Infrastructure Teams — Plan capacity for PQC migration
  • Project Managers — Build business cases with real numbers
  • Architects — Choose algorithms based on constraints
  • CISOs — Understand migration costs

Get Notified at Launch

Be the first to calculate your PQC migration impact.