A high-wattage rig is a one-time purchase and a recurring bill. The sticker is obvious; the electricity is quiet, and over a few years of daily use it can rival the cost of a component. Estimating it before you build is how you decide whether a power-hungry flagship is worth the lifetime surcharge.
The PC Power Draw Estimator separates the two numbers that matter: idle wattage (what it draws just sitting on, often with RGB and background apps) and load wattage (gaming or rendering). Multiply load by your real hours of use and your local rate, and you get an annual cost instead of a guess. Always use your actual electricity price and usage — placeholders hide the real story.
That annual figure is the input the bigger budget needs. The Build Cost (TCO) Estimator folds energy into the total picture alongside parts and peripherals, so a cheaper-up-front, hungrier machine can lose to an efficient one over the ownership window. The two tools together answer "what does this build cost me," not just "what does it cost at checkout."
Small habits shift the number: turning the machine fully off instead of sleeping, undervolting a capable GPU, or capping frame rates to what your monitor shows all trim the bill without hurting experience. Estimate the draw, fold it into TCO, and pick the build whose running cost you can live with.