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The Calcfolio

All Guides

Every human-written guide — the stories behind the numbers. No fluff.

📚 All Guides

50 guides in English — fees, money, overtime, settlements. Plus guides in Deutsch, Português and Italiano below.

How to Calculate Loan Interest

Simple, amortized, total — the 3 formulas behind every loan.

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What Is a Good APY?

The 3 tests: market-competitive, beats inflation, no fine-print games.

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Salaried Overtime Pay

$684/week threshold + duties test. When salary still earns 1.5x.

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eBay Seller Fees Explained

13.6% + $0.30. Real examples at $25, $100, $500.

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What Is a Mortgage Refinance?

The break-even math: $197/mo savings vs $6,000 costs.

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Simple vs Compound Interest

The $1,470 difference on $10K at 5% — and why time matters more than rate.

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What Is APY?

APY is what savings earn, APR is what loans cost. 5% monthly = 5.12% APY.

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The Rule of 72

72 ÷ rate = years to double your money. 6% → 12 years.

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Compounding Frequency

Daily beats monthly by ~$16 on $10K. What actually moves your outcome.

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Can Employers Refuse Overtime Pay?

No — hours worked = hours paid. But they can discipline you for it.

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How Insurers Calculate Settlements

Bills × 1.5–5x multiplier. Why the first offer is never the real number.

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PayPal vs Stripe Fees

Stripe wins on price at every amount. PayPal wins on conversion.

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Square vs Stripe Fees

Stripe wins online, always. In person there's an exact $100 tie point.

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Refinance Closing Costs

2-5% of your loan at closing. What each fee is and the break-even math.

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Etsy Offsite Ads Fee

The 12-15% fee nobody warned you about — and when you can opt out.

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Average Settlement Amounts

Why the "average" lies, realistic ranges, and what moves your number.

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Depop vs Poshmark Fees

0% vs 20% — the math is not close. But there is one twist.

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How to Reduce Etsy Fees

6 ways sellers actually save, starting with the 15% you can turn off.

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Venmo vs Cash App Fees

Venmo wins over $12, Cash App under. The full math.

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Is Overtime Taxed?

Yes, but a federal deduction made headlines. What is true and what to verify.

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What Is Time and a Half?

1.5x your rate — the math, who gets it, and real examples.

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California Overtime Rules

Daily OT, double time after 12h, and the 7th-day rule.

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How to Calculate Overtime Pay

3 steps with worked examples for hourly, salaried, and bonus pay.

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Back & Neck Injury Settlements

How these claims are really valued, what moves the number, and how to check your offer.

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Seller Fee Report 2026

eBay, Etsy, Poshmark, Depop, Grailed and Whatnot fees compared at six sale prices.

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eBay vs Etsy Fees

Real 2026 numbers side by side — plus the Etsy offsite-ads trap new sellers miss.

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When Should You Refinance?

The 1% rule, the break-even test that matters more, and when refinancing is a mistake.

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PayPal Transaction Fees

Every US PayPal fee in one table: selling, sending, instant transfers and conversion.

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How to Reduce PayPal Fees

7 legit ways to pay less — micropayments, currency traps, and what NOT to do.

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How Long Does a Settlement Take?

The 5 stages of a car accident case, what slows it down, and what's normal.

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What You'll Really Pay on a Personal Loan

Monthly payment and total interest — read your EMI like a pro.

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Don't Overpay for Your Next Car

The true cost of your auto loan — and how term length quietly adds thousands.

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Mortgage Overpayment: Save Thousands

Even small extra payments shave years off your loan. Here's the math.

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Should You Pay Off Your Car Loan Early?

Saves interest — but not always the smartest move. Decide with real numbers.

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Fixed vs Variable Interest Rate

Fixed = predictable. Variable = cheaper, until it isn't. How to choose.

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How to Improve Loan Eligibility

Lenders decide your rate before you apply. The moves that actually help.

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How to Calculate Debt-to-Income Ratio

The DTI formula in 3 steps, what counts as debt, and the limits lenders really use.

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Personal Loan vs Credit Card

Borrowing $10,000? The loan usually wins by thousands. Real comparison.

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How Much Car Can You Afford?

Forget the sticker price — find the payment that fits your life.

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Gold Price Today, Explained

Fear, rates, and the dollar drive the price. What to know before buying.

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Loan Amortization, Explained

Why early payments barely touch principal — in plain English.

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How Credit Card Interest Works

Average daily balance × daily rate × days. The $60/month breakdown.

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Poshmark Seller Fees, Explained

20% on $15+ or $2.95 under. The under-$15 trap to avoid.

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Cash-Out Refinance vs Home Equity Loan

One replaces your mortgage, the other adds a second loan. How to choose.

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Personal Loan Foreclosure in India

RBI's zero-foreclosure rule + repo hike — is prepaying worth it now?

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How Your CIBIL Score Sets Your Rate

Same loan, ₹60,000 difference — the score gap that decides your EMI.

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Top-Up Loan vs Personal Loan

One costs far less than the other. The ₹128K question, answered.

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Remortgage or Overpay? (UK 2026)

1.8M fixed deals expiring — the homeowner's decision guide.

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The 10% Overpayment Rule

ERCs and allowances explained — overpay without the penalty.

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Offset Mortgage vs Overpayments

Which saves more? The math behind the 2026 offset comeback.

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Financing an Electric Car in 2026

The $7,500 credit is gone — the loan is now the incentive.

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Dealer vs Credit Union Auto Loans

Record $787 payments — where's the best deal hiding?

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