From the desk of ChompCalc
Practical finance, health science, and math insights — written for humans, not spreadsheets.
From the amortization formula to the difference between APR and interest rate, here is everything you need to calculate any loan payment by hand — and understand what the number really means.
Read article →Your real monthly housing cost is more than principal and interest. Here's a plain-English breakdown of PITI — and the hidden costs most mortgage calculators leave out.
Read article →BMI is fast and free but can't tell muscle from fat. Body fat percentage is more precise but harder to measure. Here's how they differ, when each is useful, and which one you should track.
Read article →Time is the most powerful variable in investing. We break down the math behind compound interest and show why a 10-year head start can mean $300K more at retirement.
Read article →From Venmo rounding wars to who-ordered-the-lobster debates — a practical guide to splitting bills fairly, with the math behind tip calculation.
Read article →BMI is a useful screening tool but an incomplete health metric. Here's what it measures, where it falls short, and what complementary metrics tell a fuller story.
Read article →Your nominal salary divided by 2,080 hours isn't your real rate. Factor in taxes, commute, work clothes, and decompression time and the number changes dramatically.
Read article →Your alarm waking you mid-cycle is why you feel worse after 8 hours than 7.5. Understanding 90-minute sleep cycles helps you wake up refreshed every time.
Read article →VAT feels complicated but the mechanics are simple. Learn how value-added tax works, how to calculate it correctly, and when you should be registered.
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