Calculators for people who care whether their PC is actually quiet. No sign-up, no upload — everything runs in your browser.
Airflow and case pressure. Place your fans and GPUs on a case diagram, get intake against exhaust with the losses that filters and radiators actually cause — plus how much your graphics cards heat the air inside.
Open the calculator →What several fans sound like together. Sound adds logarithmically and rises with the fifth power of rpm, so four slow fans can beat two fast ones — or not. This works out which.
Where your coolant temperature actually settles. How much heat a 240, 280 or 360 radiator carries at a given fan speed — and what it costs in rpm to run five degrees cooler.
Power supply sizing that counts the millisecond spikes, not just the average draw — the reason a nominally sufficient PSU still trips.
Most airflow calculators subtract one catalog number from another. That number is measured in free air: a dust filter eats about a third of it, a radiator more. Ignore that and you can be off by a factor of two — which is how a build ends up dusty despite "positive pressure" on paper.
These tools account for the mounting, show a range instead of one confident-looking figure, and tell you when the answer is a close call. Where a number is an estimate, it says so.