Calculate total wattage needed for PC components or project power supply sizing.
This tool adds up the power draw of every component you plan to power - CPU, graphics card, storage, fans, pump, peripherals - and reports the total wattage your supply must deliver. You work through the list, entering or selecting each part, and the page totals the loads for you. The figure people most often misread is the total itself: it is a floor, not a recommendation. A supply running at 100% of its rating is louder, hotter, and less efficient than one sized with headroom, so the tool recommends a unit rated above the computed load, rounded to a standard size.
A concrete input and expected output from the current implementation.
Input
CPU 100W, GPU 200W, motherboard 40W, 2 RAM sticks 10W, SSD 5W, 2 case fans 5W
Expected output
Total system draw: 360W. Recommended supply: 450W (computed peak load is 80% of the rating).
The six figures sum to 360W (100 + 200 + 40 + 10 + 5 + 5). Sizing so the peak draw is 80% of the unit's rating gives 360 / 0.8 = 450W, a standard supply size, so the recommendation is 450W rather than a unit equal to the total.
Each component contributes a power figure: CPUs are rated by maximum turbo power rather than base TDP, GPUs by their board power, and drives, fans, and pumps by their continuous draws. The page sums every entry you make, so the result is only as accurate as the figures entered; underestimating one part shifts the total down.
The summed wattage is the peak load the supply must carry. A supply is most efficient and quietest between roughly 50% and 80% of its rated capacity, so the tool recommends a unit whose rating clears the total with headroom and rounds up to a standard size: 450, 550, 650, 750, 850, or 1000W. The recommendation exists because the total alone, used directly as a rating, leaves no margin.
No. The calculator totals only what you enter, and the rest of the system still draws power: a motherboard typically adds 30-50W, an SSD 2-5W, a mechanical drive about 10W, and fans and pumps a few watts each. Add everything you plan to run, or the total will come out low and may push your supply choice down a size.
Size up one step. A supply run at its rated maximum sits in its least efficient band, runs hot, and has no margin for transient spikes; some manufacturers also quote peak output as a short-burst figure, not a continuous one. The next standard size costs little more and removes the risk.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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