CalcKit Blog
Expert guides, financial tips, and calculator tutorials to help you make smarter decisions.
Pregnancy Due Date Calculator: How to Calculate Your EDD
Learn how to calculate your estimated due date using Naegele's rule, understand pregnancy trimesters, and track key milestones week by week.
Inflation Calculator: How Inflation Affects Your Money Over Time
Understand how inflation erodes purchasing power and learn to calculate the real value of money past and future. Includes inflation rate data and examples.
Gas Mileage Calculator: How to Calculate MPG and Fuel Costs
Learn how to calculate your vehicle's fuel efficiency in MPG or L/100km and estimate trip fuel costs. Save money on gas with these tips.
Grade Calculator: How to Calculate Your GPA and Weighted Average
Learn how to calculate your weighted grade average and GPA on a 4.0 scale. Step-by-step guide with examples for students.
Pace Calculator: How to Calculate Your Running Pace and Speed
Learn how to calculate running pace, convert between pace and speed, and use pace to hit your race goals. Includes pace charts for 5K, 10K, half marathon, and marathon.
Body Fat Calculator: Understand Your Body Composition
Learn how to calculate body fat percentage using the Navy method. Understand healthy ranges and why body fat matters more than BMI.
Hours Calculator: How to Calculate Work Hours and Pay Accurately
Master work hour calculations with our complete guide. Learn to calculate hours worked, handle breaks, and compute overtime pay.
Scientific Calculator Guide: Mastering Advanced Math Functions
Learn how to use a scientific calculator for trigonometry, logarithms, exponents, and more. Complete guide with examples for students and professionals.
Standard Deviation Explained: A Complete Guide with Examples
Understand standard deviation, variance, and statistical analysis. Learn when to use population vs sample standard deviation with clear examples.
Time Calculator: How to Add and Subtract Time Correctly
Learn how to add and subtract time durations accurately. Convert between days, hours, minutes, and seconds with real-world examples.
Fraction Calculator Guide: How to Add, Subtract, Multiply, and Divide Fractions
Master fraction arithmetic with clear explanations and step-by-step examples. Learn how to find common denominators, simplify fractions, and handle mixed numbers.
GST and VAT Calculator Guide: How to Add or Remove Sales Tax Correctly
Learn how to calculate GST and VAT accurately — add tax to a price, extract tax from a total, and understand the difference between inclusive and exclusive pricing.
Age Calculator: How to Calculate Your Exact Age in Days, Weeks, and Months
Learn how to calculate your exact age down to the day, including leap years and month boundaries. Plus, discover fun age-related milestones and statistics.
First-Time Home Buyer's Guide to Mortgage Calculations
Everything first-time home buyers need to know about mortgage payments, interest rates, down payments, and how to use a mortgage calculator effectively.
Tip Calculator Guide: How Much Should You Tip in Every Situation
A complete guide to tipping etiquette in 2025 — how much to tip at restaurants, bars, hotels, and more, plus the math behind splitting bills fairly.
Compound Interest Explained: The Eighth Wonder of the World
Learn how compound interest works, why it's called the most powerful force in finance, and how to use it to grow your wealth over time.
How to Calculate Your Savings Goal: A Step-by-Step Guide
Learn how to calculate exactly how much you need to save each month to reach your financial goals, with real examples and a free savings calculator.
The Complete Guide to Unit Conversion: Length, Weight, Temperature & More
Master unit conversions with this comprehensive guide covering length, weight, temperature, volume, and speed conversions with formulas and examples.
HEX, RGB, HSL: Understanding Color Formats for Web Design
A complete guide to color formats used in CSS and web design. Learn when to use HEX, RGB, or HSL and how to convert between them.
What Is a Healthy BMI? Understanding Your Body Mass Index
Learn what BMI ranges mean, limitations of BMI, and how to use it alongside other health metrics for a complete picture.
Celsius to Fahrenheit: The Complete Conversion Guide
Master temperature conversion between Celsius, Fahrenheit, and Kelvin. Learn the formulas, quick tricks, and common reference points.
Percentage Calculations You Use Every Day (Without Realizing It)
From shopping discounts to tip calculations, discover the percentage math you use daily and how to calculate them instantly.
BMI Guide: What Your Body Mass Index Really Means
Understand what BMI is, how it's calculated, what the numbers mean, and the limitations of BMI as a health indicator.
Password Strength Guide: How to Create Hack-Proof Passwords
Learn what makes a strong password, how hackers crack passwords, and best practices for creating secure passwords in 2025.
How to Calculate Loan Payments: A Complete Guide
Learn how loan payments are calculated, understand the formula behind monthly payments, and discover tips to save money on your loans.