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THE SUMFIZZ LIBRARY

Computing and data calculators

Explore 25 free tools for computing and data. Find data size converter, download time, upload bandwidth requirement and more. Each calculator explains its inputs and method, with examples you can try using your own numbers.

THE SUMFIZZ LIBRARY

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25 calculators

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Data size converter

GB is 10⁹ bytes, while GiB is 2³⁰ bytes.

Computing and data

Download time

Decimal gigabytes and megabits.

Computing and data

Upload bandwidth requirement

Bandwidth is measured in megabits per second, not megabytes.

Computing and data

Monthly data usage

Constant bitrate estimate; adaptive streaming and protocol overhead may change usage.

Computing and data

Storage capacity planner

Adds reserve to occupied storage.

Computing and data

Backup window

Sequential throughput estimate excluding scanning, compression CPU time and seek overhead.

Computing and data

Backup retention storage

Counts the explicitly retained full and incremental files.

Computing and data

RAID usable capacity

Equal-capacity drives assumed.

Computing and data

Compression ratio

Use matching units.

Computing and data

Subnet calculator

Reports conventional subnet host counts, with explicit point-to-point /31 and host-route /32 handling.

Computing and data

CIDR range summariser

Returns aligned CIDR blocks exactly covering the inclusive IPv4 range.

Computing and data

IPv6 subnet capacity

Counts address slots, not necessarily assignable devices.

Computing and data

Bandwidth-delay product

Bandwidth-delay product is rate × round-trip time.

Computing and data

Availability downtime

Assumes the percentage applies to the entire entered elapsed period.

Computing and data

Serial versus parallel speedup

Ideal Amdahl model ignoring coordination, communication and memory overhead.

Computing and data

Queue utilisation

Utilisation alone does not determine waiting time.

Computing and data

API usage cost

Linear price only.

Computing and data

Cloud storage cost

Enter provider prices.

Computing and data

Server energy cost

Interpolates mean power between idle and load.

Computing and data

Log storage growth

Retained fraction of 50% means compressed data is half the original size.

Computing and data

Image archive capacity

Decimal units.

Computing and data

Video surveillance storage

Uses constant bitrate and the entered recording schedule.

Computing and data

Password search space

Assumes uniformly random characters and exhaustive search.

Computing and data

Hash collision probability

Birthday approximation for independent uniform hashes.

Computing and data

Rate-limit capacity

Conservative full-window capacity estimate.

Computing and data