By Julie-Ann Sherlock
In the world of personal finance, a phenomenon has taken social media by storm—affectionately dubbed “Girl Math.” At first glance, it might seem like a playful, even frivolous, way to rationalise spending. But dig a little deeper, and you’ll find that this trend reveals something far more interesting about the psychology of spending, gender, and how women navigate financial decisions in a world that often scrutinises their purchases.
I am one such woman. I appease my guilt at spending too much by using girl math. But let’s take a closer look at this interesting way of calculating our spending and see if we, the fairer sex, have got it right when it comes to our spending.
What Is Girl Math?
For the uninitiated, it’s a tongue-in-cheek term to describe the mental gymnastics some women employ to justify their spending. It’s not about actual accounting but the emotional and psychological reasoning behind purchases. Some classic examples include:
- If you return an item and get a refund, that money is now “free” to spend.
- Cash payments mean the purchase “doesn’t count” because it wasn’t from your bank account.
- Buying something on sale isn’t spending money—it’s saving money.
- Splurging on a high-quality item that will last years is basically an investment.
While these justifications may seem illogical initially, they highlight a deeper truth: spending is rarely just about the numbers. For many women, purchases are tied to emotions, social pressures, and even self-worth.
The Psychology Behind The Justifications
Why do women feel the need to justify their spending? The answer lies in the way society views women and money. Historically, our financial decisions have been policed more harshly than men’s. A man buying an expensive watch might be considered successful, while a woman purchasing a designer handbag could be labelled frivolous.
This double standard means we often feel the need to defend our purchases, even to ourselves. Girl Math becomes a coping mechanism to alleviate guilt while still enjoying what we want.
Dr Janneke Blijlevens explains that it is “… a perfect display of cognitive dissonance, confirmation bias, and mental accounting being applied to consumption decisions.”
The Social Media Effect
TikTok and Instagram have amplified it into a viral trend. Women share their own versions with humour and camaraderie, creating a sense of solidarity. It’s no longer just about personal justifications; it’s a shared cultural moment where women laugh at their spending quirks while acknowledging the pressures they face.
But there’s a flip side. While the trend is lighthearted, it can also reinforce stereotypes about women being “bad with money.” Some critics argue that framing these justifications as inherently female perpetuates outdated ideas that women are less rational with finances than men.
The reality? Men engage in similar mental accounting—they just call it something else. “Bro Math” might involve justifying a $500 sneaker purchase as a “collector’s item” or a gaming console as a “long-term entertainment investment.” The difference is in the branding, not the behaviour.
When It Works—And When It Doesn’t
There’s some logic behind certain principles. For example:
- The “Cost Per Wear” Justification: If a $200 coat is worn 100 times, that’s only $2 per wear—a smart way to assess value over time.
- The “Sale Savings” Mindset: Buying a needed item on sale is financially savvy as long as it is a planned purchase.
It becomes problematic when it leads to overspending disguised as rationality. Telling yourself, “I’ll use this someday” or “It was such a good deal I couldn’t pass it up” can quickly become clutter and debt.
It is ok to spend on yourself, just make sure that you are doing it for the right reasons and not to satisfy some consumer trend or to mask a mental health issue.
Embracing Financial Confidence
Rather than dismissing it as silly or self-indulgent, perhaps we should see it as a starting point for deeper conversations about women and money. Why do women feel guilty about spending on themselves? How can financial education be more inclusive and less judgmental?
The next step is moving from justification to confidence, owning your spending decisions without apology. Whether it’s a latte every morning or a luxury bag once a year, financial empowerment means making choices that align with your values and budget, not societal expectations.
Girl Math is more than just a meme—it reflects women’s complex relationship with money. It’s about finding joy in spending while navigating the guilt that often comes with it. The key is balance: enjoying the little (or big) treats that make life richer without letting justifications override financial health.
So the next time you catch yourself doing it, smile at the cleverness of your brain and ask yourself: Is this purchase genuinely worth it? If the answer is yes, own it. After all, life’s too short to agonise over every dollar—especially when you’ve already done the (mental) math.