IT Calculators (Free & Interactive) | IT Vortex

IT Project Planning Resources

Fast planning tools for cloud, security, networks, DR, and EUC

10 Interactive IT Calculators

These calculators are built for quick, high-signal planning: subnetting, bandwidth, transfer time, storage/RAID, backup sizing, DR bandwidth, password entropy, UPS runtime, power/cooling, and VDI sizing. Use them to estimate, compare options, and sanity-check assumptions before you scope a project.

All
Network
Storage
Security
DR/BCP
EUC/VDI
Power

Tip: Most teams start with Transfer TimeBackup SizingDR Bandwidth to validate feasibility before architecture decisions.

Subnet / CIDR Calculator

Compute network, broadcast, usable range, and host count for IPv4 CIDR blocks.

Network
Network
Mask: —
Usable Host Range
Broadcast: —
Usable Hosts
/31 and /32 handled as special cases.
Use this when scoping VLANs, VPN pools, or segmentation plans.

Bandwidth Converter (Mbps ⇄ MB/s)

Convert between bits and bytes to align ISP links, replication, and backup windows.

Network
50% 85% effective throughput 98%
Effective Mbps
After applying efficiency.
Effective MB/s
Useful for file transfer & repo ingest.
Effective GB/hour
Rough “how much can move per hour”.
A practical default for WAN planning is 80–90% effective throughput.

File / Dataset Transfer Time

Estimate duration to move TB/PB over a given link (with overhead and concurrency).

Network
Estimated Time
Effective rate: —
Per-Stream Target
Helps set expectations for concurrency/limits.
Days (24x7)
For migrations or initial seeding estimates.
Use this for backup seeding, cloud migration windows, or DR initial replication.

RAID Usable Capacity

Estimate usable storage for RAID 0/1/5/6/10 (simplified, planning-grade).

Storage
Raw Capacity
Drive count × drive size.
Usable (RAID)
Usable After Reserve
Planning for snapshots, metadata, growth.
This is a sizing shortcut; vendor implementations vary (hot spares, parity layout, etc.).

Backup Repository Sizing (Planning)

Estimate backup storage needed using data size, change rate, retention, and compression/dedupe.

Storage
Estimated Logical Backup (TB)
Fulls + incrementals (GFS model).
Estimated Physical Repo (TB)
After reduction factor.
Recommended Provisioned (TB)
Includes headroom for growth and variability.
Best for quick repository planning; for production, validate job types (synthetic fulls, immutability, copy jobs).
Explore BaaS

DR Bandwidth Planner (RPO Feasibility)

Estimate bandwidth needed to meet an RPO given data size and change rate.

DR/BCP
Data to Replicate per RPO
Estimated changed data per RPO window.
Required Mbps (effective)
After efficiency factor.
Rule-of-Thumb Link
Rounded to a practical circuit size.
If required Mbps exceeds your circuit, adjust RPO, reduce change rate, or add WAN optimization.
Explore DRaaS

Password Entropy & Crack-Time (Estimate)

Estimate entropy bits and rough offline crack time based on charset and length.

Security
Entropy (bits)
Higher bits = exponentially harder.
Search Space
Total combinations.
Avg Crack Time (offline)
Assumes brute force; real attacks vary.
Promote passphrases + MFA; entropy rises faster with length than complexity.
Explore SECaaS

UPS Runtime Estimator

Estimate runtime from load and UPS watt capacity (planning-grade).

Power
Load % of UPS
Keep typical loads < ~80% for headroom.
Estimated Runtime
Based on usable battery Wh.
Usable Battery Energy
Battery Wh × derating factor.
For precise runtime, use the UPS vendor runtime chart for your exact model/battery pack.

Power → Cooling (BTU/hr) + Cost

Convert IT load (watts) into BTU/hr and estimate monthly energy cost.

Power
Cooling Load
BTU/hr ≈ Watts × 3.412
Total Facility kWh (PUE)
Includes overhead beyond IT watts.
Estimated Monthly Cost
Directional estimate; utility tariffs vary.
Useful for rack planning, colocation comparisons, and “build vs buy” conversations.

VDI / DaaS Sizing (CPU/RAM/IOPS Planning)

Quick estimate for desktop pools. Good for early-stage feasibility and high-level capacity planning.

EUC/VDI
Concurrent Desktops
Users × concurrency.
Total vCPU Required
Concurrent × vCPU/desktop, incl. reserve.
Total RAM Required (GB)
Concurrent × RAM/desktop, incl. reserve.
Total IOPS Required
Concurrent × IOPS/desktop, incl. reserve.
Estimated Physical CPU Cores
Total vCPU ÷ oversubscription (planning-grade).
Reserve Applied
HA/headroom factor applied to totals.
Effective vCPU per Desktop
After profile minimum enforcement (if enabled).
Effective RAM per Desktop (GB)
After profile minimum enforcement (if enabled).
Effective IOPS per Desktop
After profile minimum enforcement (if enabled).
Estimate physical resources required in a VDI environment for proper performance and redundancy
Explore DaaS