CalcCrunch Blog
Practical guides, real examples, and expert tips to help you make smarter financial and health decisions.
Featured Guides
How Much House Can I Afford? A Complete Guide for 2026
Learn exactly how much house you can afford based on your income, debts, and down payment. Includes the 28/36 rule, FHA limits, and real examples at every salary level.
Compound Interest Explained: How Your Money Grows While You Sleep
Understand how compound interest works, why Einstein called it the 8th wonder, and how to use it to build wealth. Includes real growth examples and a free calculator.
The 50/30/20 Budget Rule: A Simple System That Actually Works
Master the 50/30/20 budgeting method with practical examples at every income level. Learn how to allocate your paycheck for needs, wants, and savings without spreadsheets.
All Articles
How to Calculate a Confidence Interval (With Examples)
Learn how to calculate a confidence interval for a sample mean or proportion, step by step, with worked examples and a free calculator.
How Is a Due Date Calculated? Pregnancy Due Date Explained
Your due date is estimated as 280 days from the first day of your last period. Learn how Naegele's rule works, how ultrasounds adjust it, and why only 5% of babies arrive on their exact due date.
How to Calculate a Z-Score (With Examples)
A z-score tells you how many standard deviations a value is from the mean. Learn the formula, see worked examples, and convert z-scores to percentiles.
Fall Marathon Training Plan: When to Start (16-Week Guide)
Find out exactly when to start training for a fall marathon, how a 16-week plan is structured week by week, and how to adjust if you're starting later than planned.
How to Calculate Standard Deviation (Step-by-Step Guide)
Learn how to calculate standard deviation step by step, the difference between sample and population formulas, and when to use each — with a worked example.
2026 FSA and HSA Contribution Limits: What Changed and How to Plan
The 2026 HSA limit is $4,400 (self-only) / $8,750 (family) and the FSA limit is $3,400. See what changed from 2025, how to plan your paycheck contributions, and key deadlines.
How to Calculate Aspect Ratio (16:9, 4:3, and Custom Sizes)
Learn how to calculate aspect ratio from pixel dimensions using the GCD method, tell 16:9 from 4:3 and 21:9, and resize an image or video without distorting it.
Q3 2026 Estimated Tax Deadline: What Freelancers Need to Know
The Q3 2026 estimated tax deadline is September 15 — one week after Labor Day. Here's who owes, how to calculate your payment, and how to avoid an IRS underpayment penalty.
How to Find GCF and LCM (With Step-by-Step Examples)
Learn how to find the Greatest Common Factor (GCF) and Least Common Multiple (LCM) using prime factorization, listing, and the ladder method — with worked examples.
New Federal Student Loan Rates for 2026-2027: What Borrowers Need to Know
Federal student loan interest rates rise for 2026-2027: 6.52% undergrad, 8.07% grad, and 9.07% PLUS. See how the new rates are set and what they mean for your payment.
How to Calculate Your Running Pace (Plus Race Time Predictor)
Learn the simple formula for calculating running pace, convert between miles and kilometers, and see predicted 5K, 10K, half marathon, and marathon finish times.
How to Calculate the Number of Days Between Two Dates
Learn how to calculate the exact number of days, weeks, or months between two dates by hand and with a free calculator — plus how to count down to school starting, a deadline, or any event.
How Much Water Should You Drink? A Science-Based Guide
Learn exactly how much water you should drink based on your weight, activity, and climate — plus why the '8 glasses a day' rule falls short and how to spot dehydration early.
College Dorm Budget Guide 2026: What Move-In Really Costs
How much does it cost to move into a college dorm? A full item-by-item budget breakdown ($400-$900) plus tips to save on essentials before move-in day.
How to Calculate Unit Price (and Actually Find the Better Buy)
Learn the unit price formula (price ÷ quantity) so you can compare any two package sizes and instantly see which one is the better deal — plus why bigger isn't always cheaper.
Back-to-School Tax-Free Weekend 2026: Dates by State (and How Much You'll Save)
See every 2026 back-to-school sales tax holiday date by state, what qualifies, and exactly how much you save on a typical shopping list using the sales tax calculator.
How to Calculate a Ratio (Simplify, Scale & Solve Proportions)
Learn how to simplify a ratio, scale it up or down, solve for a missing value in a proportion, and tell whether two ratios are equivalent — with worked examples.
How to Calculate the Average: Mean, Median, and Mode Explained
Learn how to calculate the mean, median, and mode — and when each one gives you a more accurate picture. Includes step-by-step examples, a comparison table, and a free average calculator.
Back-to-School Budget Guide: How Much to Spend (and How to Save)
Plan your back-to-school spending with confidence. See average costs by grade level, a category-by-category budget breakdown, and smart strategies to save without skipping essentials.
How to Calculate Road Trip Fuel Cost (and Actually Stick to Your Budget)
Learn the simple formula for estimating road trip gas costs, see a real worked example, and get tips to spend less at the pump this summer.
Average vs. Median: Which One Should You Use?
Learn the difference between mean and median, when each gives you misleading answers, and how to pick the right measure for your data.
Why Is My Electric Bill So High? 10 Appliances That Cost More Than You Think
Find out which appliances are driving up your electricity costs with real kWh calculations. Learn simple changes that can cut your bill by 20-40% without sacrificing comfort.
How to Calculate Percentage Change (Increase, Decrease & Formula Explained)
Learn the percentage change formula with step-by-step examples for increases, decreases, and real-world applications like price changes, salary raises, and test scores.
How to Calculate Your GPA: Weighted vs Unweighted (With Examples)
Learn how to calculate both weighted and unweighted GPA, understand the 4.0 scale, and see what GPA you need for your target colleges. Includes grade conversion charts.
Salary vs Hourly Pay: Which Is Better for You? A Complete Comparison
Compare salary vs hourly pay across overtime, benefits, taxes, and job security. See which pay structure puts more money in your pocket — with real examples.
How to Add, Subtract, Multiply, and Divide Fractions (With Examples)
Master fraction operations with this step-by-step guide. Learn to add, subtract, multiply, and divide fractions and mixed numbers with worked examples and simple rules.
How Tax Brackets Actually Work (Most People Get This Wrong)
Clear up the most common tax misconception and learn how marginal tax rates work with visual examples. See exactly how much tax you owe at every income level.
Celsius to Fahrenheit Explained: The Formula, a Quick Mental Trick, and a Free Calculator
Learn the Celsius to Fahrenheit formula, a fast mental-math shortcut, and when each scale is used — plus a free converter for any temperature.
How Much Does Meal Prepping Actually Save? We Did the Math
A real cost comparison of meal prepping vs eating out vs grocery shopping without a plan. Includes weekly breakdowns, time investment analysis, and tips to maximize savings.
When Should You Refinance Your Mortgage? The Break-Even Rule
Learn the exact math behind refinancing decisions. Calculate your break-even point, see when refinancing saves money, and avoid the common traps that cost homeowners thousands.
What Is TDEE? How to Calculate Your Total Daily Energy Expenditure
Understand TDEE (Total Daily Energy Expenditure), how it's calculated, and how to use it for weight loss, maintenance, or muscle gain with practical daily examples.
Debt Avalanche vs Snowball: Which Payoff Method Saves You More?
Compare the two most popular debt payoff strategies with real numbers. See which method saves the most interest and which keeps you motivated longer.
How to Calculate a Discount (Percent Off Made Easy)
Calculate any discount in seconds: the percent-off formula, mental-math shortcuts, and how stacked discounts really work.
Sales Tax by State: 2026 Rates and How to Calculate It
See how sales tax works by state, which states have none, and how to calculate the tax and total price on any purchase.
How Much Should You Have in an Emergency Fund? (And Where to Keep It)
Find out exactly how much you need in an emergency fund based on your expenses, job stability, and life situation. Plus the best places to keep it earning interest.
How to Convert KG to LBS (With a Simple Formula & Chart)
Learn how to convert kilograms to pounds with a simple formula, a quick mental-math shortcut, and a kg-to-lbs reference chart.
How Much House Can I Afford? A Complete Guide for 2026
Learn exactly how much house you can afford based on your income, debts, and down payment. Includes the 28/36 rule, FHA limits, and real examples at every salary level.
Compound Interest Explained: How Your Money Grows While You Sleep
Understand how compound interest works, why Einstein called it the 8th wonder, and how to use it to build wealth. Includes real growth examples and a free calculator.
The 50/30/20 Budget Rule: A Simple System That Actually Works
Master the 50/30/20 budgeting method with practical examples at every income level. Learn how to allocate your paycheck for needs, wants, and savings without spreadsheets.
How to Calculate BMI: Formula, Chart, and What Your Number Actually Means
Learn how BMI is calculated, what the categories mean, when BMI is misleading, and better alternatives for measuring health. Includes the formula, a chart, and free calculator.
How Much Should You Have Saved for Retirement by Age?
Retirement savings benchmarks for every age from 25 to 65. See if you're on track, how to catch up if you're behind, and the power of starting early with real numbers.