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Practical guides on finance, health, math, and more — written to help you get more out of every calculation.
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Roth IRA Explained: How It Works, Limits & Rules
Pay tax now, never again. How a Roth IRA works, who can open one, the 2026 limits, and the withdrawal rules most people get wrong.
Why Your Money Buys Less Every Year (Inflation, Explained)
A coffee that ran $3 a decade back now costs $4.50, and the cash in your savings is quietly shrinking. Here's the plain math behind inflation, plus what $100 today is really worth in 10 and 25 years.
Capital Gains Tax: What You Owe When You Sell (and How to Owe Less)
You bought stock for $5,000 and sold it for $9,000. That $4,000 profit gets taxed, sure. But how much you actually hand over hinges on one thing most people never think about: how long you held it. Here's the math.
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HELOC Explained: How a Home Equity Line of Credit Works
Turn home equity into a credit line you can tap — how a HELOC works, how it differs from a home equity loan, what you can borrow, and the real risks.
Debt Snowball vs Avalanche: The Fastest Way to Get Out of Debt
Three debts. One spare $300 a month. Two ways to swing at them. We run a real $9,500 example both ways so you can see which method clears debt faster, saves more interest, and actually fits the way you budget.
APR vs APY: Why the Rate You See Is Not the Rate You Pay
A 24% APR card quietly costs you about 26.8% a year once monthly compounding does its thing. Here's the tiny formula behind the gap, plus a worked example you can copy and steal.
How Many Calories You Actually Burn When You Exercise
Your watch says 412 calories burned. It's probably off by a hundred or more. Here's the actual MET formula behind exercise calorie burn, a worked example you can follow along with, and why trackers and gym machines keep guessing high.
How Currency Exchange Rates Actually Work (and Why You Get a Worse Rate)
That number on Google is almost never the number you walk away with. Here's how exchange rates actually work, why banks and kiosks quietly shave off a few percent, and how to claw most of it back.
Pregnancy Due Date Calculator: When Is Your Baby Really Coming?
Work out your pregnancy due date free using LMP, conception date, IVF transfer, or ultrasound. You'll get the three standard formulas, two worked examples, trimester milestones, and the reason only about 5% of babies actually arrive on the predicted day.
Time Card Calculator: How to Track Work Hours and Calculate Overtime Pay
Turn clock-in and clock-out times into accurate daily totals, weekly hours, and overtime pay. A free time card calculator that handles unpaid breaks, midnight shifts, split shifts, and US/India/UK overtime rules — no manual math required.
Loan Calculator: How to Compare Personal, Auto, and Home Loans Before You Sign
Compare personal, auto, and home loans with a free loan calculator. See your EMI, total interest, and the full amortization schedule before you sign anything.
Body Fat Percentage Calculator: 3 Free Methods That Actually Work
Work out your real daily calorie needs with the Mifflin-St Jeor BMR formula and an honest activity multiplier for TDEE — two worked examples, the full method, and a free calorie calculator to skip the math.
How Much Money Do You Need to Retire? A Step-by-Step Calculator & Worked Example
Figure out your retirement number using the 4% rule, inflation-adjusted projections, and FIRE math — plus two worked examples and a free retirement calculator that handles the arithmetic for you.
Tip Calculator: How to Split a Restaurant Bill Without Awkward Math
Figure out a fair tip and split any restaurant bill evenly or by what each person actually ordered. You'll get the formula, two worked examples, country-by-country tip standards, and a straight answer on whether to tip on tax or subtotal.
Daily Calorie Calculator: TDEE, BMR & How Many Calories You Actually Need
Work out your real daily calorie target with BMR and TDEE, the Mifflin-St Jeor formula, two worked examples, and a free calorie calculator that does the math for you.
How to Calculate Your Mortgage Payment in 2026: Formula, Examples & Free Calculator
Work out your monthly mortgage payment by hand with the PITI formula, walk through two fully worked examples, and double-check every figure against a free mortgage calculator.
How to Calculate Your GPA on a 4.0 Scale (Weighted & Unweighted Examples)
Learn how to calculate your GPA on the 4.0 scale, with clear weighted vs unweighted examples, semester and cumulative methods, and a free calculator that handles international transcripts.
Age Calculator: How to Calculate Your Exact Age in Years, Months, and Days
Percentage math really comes down to three formulas. Here are 9 worked examples — percent of a number, increase, decrease, reverse, error, and chained discounts — plus a free calculator that solves every variation.
Compound Interest Made Simple: Formula, Worked Examples & a Free Calculator
A plain-English walk through the compound interest formula, with two full worked examples, monthly vs annual compounding, the mistakes that trip people up, and a free calculator to check your own numbers.
SIP Calculator: How to Plan Mutual Fund Investments the Smart Way
A free SIP calculator turns "how much per month?" into a clear answer in seconds. Grab the future-value formula, two worked examples for ₹1 crore and a child's education, plus the inflation and return traps that quietly sink most plans.
How to Calculate Percentage: 9 Real-World Examples Solved Step-by-Step
Percentage math feels slippery until you spot the pattern. Here are 9 worked examples — percent of a number, increase, decrease, reverse, error, chained discounts — plus a free calculator that solves every variation in two clicks.
BMI Calculator: What Your Body Mass Index Score Really Tells You (2026 Guide)
A plain-English guide to BMI — the formula, WHO categories, Asia-Pacific cutoffs, why it misreads muscle, and how to read your own score without panicking, plus a free calculator to run the numbers.
EMI Calculator Explained: The Formula, Amortization Table & How to Pay Off Loans Faster
EMI math is one formula plus an amortization table. See how each payment splits between principal and interest, why a lower EMI can quietly cost more, and how to use a free EMI calculator to test prepayments on any home or personal loan worldwide.