DNS TTL Calculator
Convert TTL seconds to human-readable format. Look up TTL values for all DNS records of any domain.
TTL Calculator converts TTL seconds into human-readable format (1 hour / 24 hours / 7 days). Plus reverse — minutes/hours/days to seconds. Helps when configuring DNS and Cache-Control headers.
TTL Converter
Enter seconds or use presets to convert TTL to days/hours/minutes
Common TTL Values
| Seconds | Duration | Use case |
|---|---|---|
| 60 | 1 minute | DNS migration / temporary |
| 300 | 5 minutes | Frequently updated records |
| 900 | 15 minutes | Dynamic IP / load balancing |
| 3600 | 1 hour | Standard for most records |
| 14400 | 4 hours | Stable records (MX, NS) |
| 86400 | 1 day | Very stable, rarely changed |
| 604800 | 1 week | NS / SOA serial records |
Domain DNS TTL Lookup
Enter a domain to see TTL values for all its DNS records
Why teams trust us
How it works
Enter TTL in seconds
Convert to h/min/days
Calculate propagation window
What is TTL and why does it matter?
TTL (Time To Live) in DNS defines how long resolvers cache a record. Choosing the right TTL affects how fast DNS changes propagate and the load on the authoritative server.
TTL Calculator
Convert seconds to readable format and back: 86400 = 1 day.
Propagation Window
Estimate when a DNS record change will be visible to all users worldwide.
Migration Scenarios
TTL recommendations before server migration: when to lower, when to restore.
Common Values
Reference for standard TTLs: 300, 3600, 86400 — which to use for which records.
Who uses this
DevOps
DNS migration planning
Sysadmins
TTL record optimization
DNS admins
cache time calculation
Developers
TTL understanding for APIs
Common Mistakes
Best Practices
Monitor DNS records automatically
DNS monitor notifies you when A, MX, or TXT records change.
Sign up freeWhat is DNS TTL and How Does Caching Work?
TTL (Time To Live) is a DNS record parameter that specifies how many seconds a resolver can cache the record before requesting a fresh copy from the authoritative nameserver. A low TTL (60–300 s) means changes propagate quickly but increases load on DNS servers. A high TTL (3600–86400 s) reduces lookup latency and server load but delays propagation after a record change. Use this calculator to convert between seconds and human-readable formats before updating your DNS records.
Learn more
Glossary
Frequently Asked Questions
What is TTL?
TTL (Time To Live) is how long a DNS record stays cached. Determines how long resolvers keep the record without re-querying.
What TTL should I set?
300 sec (5 min) for frequently changing records. 3600 (1 hour) for stable ones. 86400 (1 day) for rarely changing MX/NS.
Related guides
Longer-form reading on this topic from the knowledge base.
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