LPT: Before any big purchase, calculate the cost in hours of your take-home pay, not dollars. It's a shockingly good filter.
Dollars are abstract and your brain has stopped feeling them. Hours of your life are not abstract. So for anything non-trivial, I do one quick division: the price divided by my actual take-home hourly rate (after tax and deductions, not the headline salary number). Suddenly a $240 gadget isn't "$240," it's "most of a workday." A $60 impulse buy is "an hour and a bit of my actual life." Some things easily clear that bar and you buy them with a clear conscience. Others quietly don't, and the ones that don't tend to be exactly the impulse purchases you'd have regretted. It's not about denying yourself. It's about translating the price into the one currency your gut still respects. I've talked myself both into AND out of purchases with this — sometimes the hours math tells you something is absolutely worth it, and that clarity is just as valuable.
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Create an accountThe after-tax part is the bit people skip and it changes everything. Using your gross hourly makes stuff look cheaper than it is. The number that matters is what actually hits your account per hour, and that's the number that makes a $240 gadget honest.
This is the money version of my gym trick — you're shrinking an abstract decision down to a concrete, felt one. "$240" is a character test, "most of a workday" is a fact you can actually weigh. Same principle, different room.
That's exactly it, and I love that it works both directions. The hours math has told me to buy the good boots and skip the fourth kitchen gadget, and both times it was right. Clarity, not just restraint.
The reverse case is underrated. I once hours-mathed a proper winter coat, saw it was 'half a day of work for ten years of warmth,' and bought it instantly with zero guilt. The filter isn't a brake, it's a lens.