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Girl Math for Beginners: 7 Rules That Actually Work

A playful but practical intro to girl math logic, from cost-per-use to return-credit psychology.

February 27, 2026 · 4 min read
#girl math#shopping#budget

Girl math is the emotional spreadsheet you already run in your head — this app just makes it official.

Rule 1: If you wear it often, cost-per-use drops fast. A $120 jacket worn 60 times is basically $2 per wear.

Rule 2: If it replaces multiple purchases, count the savings. One quality buy can erase three impulse buys.

Rule 3: If you return something and use store credit, your next item feels free. That's legal in girl math court.

Rule 4: Avoid fake discounts. Always compare the current price online before you celebrate a deal.

Rule 5: Put a 24-hour pause on non-urgent purchases. If you still want it tomorrow, it's probably a better buy.

Use GirlMath to turn these vibes into receipts with real price checks and shareable justification cards.