Free IT Tools for Engineers | Calculators & Utilities

Featured tools (own URL)

The most-used calculators each live at their own URL. Easier to share, faster to load, and indexed individually:

Subnet calculator — IPv4 CIDR, mask, host range
Azure & AWS pricing — monthly VM cost across regions
SQL Server licensing — per-core licensing in GBP

ZFS RAID Calculator

Calculate capacity and IOPS for ZFS RAID configurations (RAIDZ1/Z2/Z3).

RAID Type

Number of Disks

Disk Size (TB)

Disk Type

Number of Pools

Multiple pools allow parallel I/O

Ceph Storage Calculator

Calculate Ceph cluster capacity and estimated IOPS.

Replication Factor

Number of OSDs

OSD Disk Size (TB)

OSD Disk Type

Download Speed Calculator

Calculate download times for various file sizes and connection speeds.

File Size

Size Unit

Connection Speed (Mbps)

1 Gbps = 1000 Mbps, 10 Gbps = 10000 Mbps

Cloud Pricing Calculator (Azure / AWS)

Quick cost estimates in GBP for popular VM configurations.

Region

VM Type

Number of VMs

Storage (GB)

Disk Type

Pricing varies by region

Region

Instance Type

Number of Instances

EBS Storage (GB)

Volume Type

Pricing varies by region

Note: Pricing is approximate (GBP), pay-as-you-go list rates excluding RIs / Savings Plans / EA discounts. Last calibrated 2026-04-25. Always verify against the vendor calculator before quoting a customer.

SQL Server Licensing Calculator

Estimate SQL Server licensing costs (per core licensing model).

Edition

License Type

Physical Cores

Minimum 4 core licenses per processor

Number of Servers

Oracle Database Licensing Calculator

Estimate Oracle DB licensing costs (Processor licensing).

Edition

Processor Type

Total Cores

Include Annual Support?

RHEL Subscription Calculator

Estimate Red Hat Enterprise Linux subscription costs.

Subscription Type

Term

Number of Subscriptions

VMware Licensing Calculator

Estimate VMware licensing costs after the Broadcom subscription-only model (Nov 2023). Pricing is now per-core, subscription-only; perpetual licences are no longer sold for new customers, and the legacy Essentials / Essentials Plus / Standard / Enterprise Plus SKUs were retired.

VMware SKU (subscription, per core/yr)

Support level

Total cores (across all hosts)

Broadcom enforces a 16-core minimum per CPU socket.

Term (years)

Windows Server Licensing Calculator

Estimate Windows Server licensing costs (per core licensing).

Edition

License Type

Physical Cores

Minimum 16 cores per server, 8 per processor

Number of Servers

CALs Required (User/Device)

Base64 Encoder / Decoder

Encode or decode Base64 strings.

Input

Output

Results will appear here...

ROT13 Encoder / Decoder

Apply ROT13 cipher (encoding and decoding are the same operation).

Input

Output

Results will appear here...

Unicode Lookup

Look up Unicode code points or convert characters.

Enter Character(s)

Enter Code Point (hex)

Result

Results will appear here...

IP Visualization

View your current public IP and basic information.

IP Geolocation

Look up geographical location of an IP address.

IP Address

DNS Lookup

Query DNS records for a domain.

Domain

Record Type

DNS Propagation Checker

Check DNS propagation across multiple global servers.

Domain

Record Type

Tor Exit Node Check

Check if an IP address is a known Tor exit node.

IP Address

Subnet Calculator

Calculate subnet details from IP address and CIDR notation.

IP Address

CIDR / Prefix

WHOIS Lookup

Look up domain registration information.

Domain