About InfraToolbox

What this is

InfraToolbox is a set of 14 calculators for the everyday arithmetic of data center and network infrastructure work: PDU capacity, cooling load, airflow, UPS runtime, rack space, floor loading, fibre loss budgets, subnetting, colocation pricing and capacity planning.

They exist because this arithmetic is simple, easy to get subtly wrong, and consequential when you do. The 80% continuous-load derate, the difference between two feeds and twice the power, converting a temperature difference rather than a temperature — each of these is a one-line mistake that produces a plausible-looking wrong answer.

How the numbers are verified

Every calculation is implemented as a pure function with unit tests checking it against independently known values — 1 kW is 3412 BTU/hr, a 208 V 30 A three-phase PDU derates to 8.65 kW, a /26 has 62 usable hosts. The test suite runs before every deployment.

Edge cases are handled deliberately rather than accidentally. Any division that could produce infinity returns a dash instead of a nonsense number, because a tool that confidently prints Infinity is worse than one that admits it cannot answer.

That said: these are planning tools. They do not replace a qualified electrical, mechanical or structural engineer, and every page says so where it matters. Verify against manufacturer documentation and local code before committing to a design.

Privacy by construction

Nothing you type is transmitted anywhere. Every calculator runs in your browser as static JavaScript — there is no backend to send data to and no account to create. You can verify this by opening your browser's network tab while using any tool. See the privacy policy for the full detail.

How it is funded

The calculators are free and supported by advertising. There is also a paid tool — the rack elevation diagram builder — which produces client-ready rack documentation with a branded title block, bill of materials and print-quality PDF export.

Being straightforward about this: the free tools bring people here, and some of those people need the paid one. Nothing on this site is artificially limited to push you toward it.

Corrections

If you find a calculation that disagrees with your own working, please say so through the contact page. Include the inputs you used and the figure you expected. Errors in engineering tools deserve to be fixed quickly, and a correction from a working engineer is more valuable than any amount of internal review.