📝 CalcMatrix Blog · Page 12

"What percentage of your monthly income should go to your mortgage before it becomes too much? The classic 28/36 rule sets two red lines: housing costs at or below 28% of income, and total debt (including car loans and credit cards) at or below 36%. This guide explains the math, a quick table of monthly-payment caps by income, and how to adapt the rule to real-world buying."

"Choosing between equal-principal and equal-installment mortgage repayment is one of the biggest money decisions you'll make. This guide compares monthly payment structure, total interest, early-repayment impact, and how to decide based on your income ratio and loan term, with a decision table."

"Commuting 10 to 20 kilometers every day — motorcycle or car? Put purchase price, fuel, maintenance, insurance, and depreciation into one commuting ledger and choose by your mileage, lifestyle, and income. Do not pay for performance you will not use, and do not suffer to save a little gas."

"Moving costs more than the moving company's quote: packing materials, time off work, deposits, and incidentals all add up. Walk through a line-item checklist to keep your move on budget."

"Active funds promise star managers and outperformance; ETFs offer low fees and transparent rules. Which actually earns more? Put management fees, trading costs, the probability of outperformance, and tax treatment on one 10-year ledger, and the answer depends on your investing style and account size, not a feud over which is better."

"Beyond the purchase price, closing on a new home in China comes with a sizable one-time bill. This guide itemizes deed tax, the housing maintenance fund, prepaid property fees and area-difference settlements, with real numbers for first and second homes."

How much should you be paid for overtime? 1.5× for extra weekday hours, 2× for weekends, 3× for public holidays — here's how the overtime pay calculation actually works, how the base rate is set, and the common mistakes that leave workers underpaid. Free salary and percentage calculators included.

Calculating ovulation is the first step to conceiving scientifically. This guide covers the ovulation formula, cycle-based prediction, ovulation test strips, and basal body temperature — plus a free ovulation calculator to lock in your fertile window.

"Got extra cash and want to make a partial mortgage prepayment? Should you shorten the term or lower the monthly payment? This guide compares both options with real numbers and helps you choose."

Have 200,000 in spare cash — pay off your mortgage or invest it? This guide skips the old "interest saved" argument and instead puts both options on a 20-year timeline, using a compound interest calculator to show the real gap, then adds liquidity, psychology, and risk into a clear decision framework.