Technology & Computing
TLS Handshake Latency Overhead Calculator
Estimate the extra round-trip latency added by TCP and TLS handshakes for TLS 1.2, TLS 1.3 1-RTT and TLS 1.3 0-RTT resumption.
Your inputs
Change any value to update the result instantly.
Total connection setup time
100 ms
TCP handshake time
50 ms
TLS handshake time
50 ms
Total round trips required
2
0-RTT resumption removes handshake latency entirely for repeat connections but carries replay-attack risk for non-idempotent requests.
Formula and working
Total setup time = (TCP RTTs + TLS RTTs) × round-trip time
- 1
Collect the inputs
Network round-trip time (RTT) = 50; Handshake mode = 1
- 2
Apply the formula
Total setup time = (TCP RTTs + TLS RTTs) × round-trip time
- 3
Result
Total connection setup time = 100 ms
Frequently asked questions
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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