Free IT Infrastructure Calculators and Tools
21 free calculators and checks for storage, networking, power and licensing, plus end of life dates for 477 products. No sign-up. Every result shows its formula or rule.
End of life lookup
Is it still supported? End of life, end of support and security fix dates for 477 products: Windows, Windows Server, macOS, Ubuntu, SQL Server, PHP, Python and more.
Popular: Apple iPhone · Apple iOS · Android OS · Samsung Mobile · Google Pixel · Apple iPad · Apple iPadOS · Apple macOS · Microsoft Windows · Microsoft Windows Server · All 477 products
Storage
- RAID Calculator
Usable capacity, speed and drive-failure tolerance for RAID 0 to 60. - RAID Rebuild
Rebuild time and unrecoverable read error risk while an array is degraded. - IOPS / Throughput
Convert between IOPS, block size and MB/s. - Transfer Time
How long a migration or backup copy takes at a given link speed. - Backup Capacity
Backup storage needed for your retention and change rate. - CCTV Storage
Video storage for cameras, bitrate and days kept.
Network
- Subnet Calculator
IPv4 network, mask, broadcast and usable host range from a CIDR. - VLSM Planner
Split an IPv4 block into right-sized subnets. - IPv6 Subnet
IPv6 prefix ranges and how many subnets fit. - PoE Budget
Whether a switch PoE budget covers your devices. - VoIP Erlang B
SIP trunks or lines needed for a call load (Erlang B). - SSL Expiry
When a site certificate expires, read live. - Security Headers
Which HTTP security headers a site sends, with the reason for each. - DNS Lookup
A, MX, TXT, NS and other DNS records with TTLs.
Power
- Rack Power
Rack power draw, amps and heat (BTU/hr). - UPS Runtime
UPS battery runtime at your load. - Power Cost
What equipment costs to run per month and year.
Planning
- VM Host Sizing
Hosts needed for your VMs, with failover headroom. - Windows Licensing
Windows Server core licenses for a host or cluster. - SQL Server Licensing
SQL Server 2025 and 2022 core licenses, packs and CALs, with the rule for each line. - Downtime Cost
What an outage costs per hour and per incident. - End of Life Lookup
End of life and support dates for every version of a product.
How RACKCRUNCH works
- Every calculator lists its formula and assumptions on the Methodology page. Licensing and end of life pages cite their sources.
- Calculations run in your browser. Only the SSL, security header and DNS tools send the domain you enter to our server, to read that site's public data.
- Bad input shows an error, not a made-up number. Found a wrong result? Tell us.