Calculator Guides
Clear explanations and worked examples for EMI, SIP, salary, GST, BMI and more, with free calculators.
Calculator Guides · 6 min read
How to Calculate a Mortgage Payment (PITI) — With Example
The formula behind your monthly mortgage payment, what PITI means, and a worked $400k example.
Read guideCalculator Guides · 5 min read
How to Calculate a Car Payment — With Tax & Trade-In
How the amount financed and monthly car payment are worked out — tax and trade-in included.
Read guideCalculator Guides · 6 min read
How a 401(k) Employer Match Works — And Why It Matters
What '50% up to 6%' really means, how to capture the full match, and how it compounds over a career.
Read guideCalculator Guides · 5 min read
How to Pay Off Credit Card Debt Faster — The Math
Why minimum payments trap you, and how a bigger payment cuts both the time and the interest.
Read guideCalculator Guides · 4 min read
How to Calculate Sales Tax: Add & Remove It — Formula
How to add sales tax to a price and how to reverse it out of a total — with formulas and examples.
Read guideCalculator Guides · 4 min read
How to Calculate the Days Between Two Dates
Count days between two dates accurately — including the inclusive/exclusive trap and how to count only working days.
Read guideCalculator Guides · 4 min read
How to Convert Units: Length, Weight & Temperature
The conversion factors that actually matter — cm↔in, kg↔lb, °C↔°F — with worked examples and a free converter.
Read guideCalculator Guides · 3 min read
How to Count Words and Characters (Free, No Upload)
Count words, characters, sentences and reading time — and hit strict limits with confidence — free and private in your browser.
Read guideCalculator Guides · 3 min read
How to Calculate a Tip and Split the Bill (Quick Guide)
Fast mental math for a 15/18/20% tip, splitting the bill evenly, and the tip-on-tax question answered.
Read guideCalculator Guides · 4 min read
How to Calculate Your Exact Age (Years, Months & Days)
The manual method for an exact age in years, months and days — plus the leap-year trap most people miss.
Read guideCalculator Guides · 5 min read
How to Read a Loan Amortization Schedule (With Example)
How each loan payment splits into interest and principal, why prepaying early saves the most, and the true total cost.
Read guideCalculator Guides · 4 min read
How to Calculate a Discount and Sale Price (With Examples)
The discount and sale-price formulas, quick mental tricks, stacked discounts, and how to find the percent off.
Read guideCalculator Guides · 6 min read
How to Calculate Your Daily Calorie Needs (BMR & TDEE)
Work out your BMR and TDEE with the Mifflin-St Jeor formula, then set calories for cutting, maintaining or gaining.
Read guideCalculator Guides · 6 min read
How to Calculate In-Hand Salary from CTC (With Example)
Why your CTC and your bank credit differ — the gross-to-net breakdown with a worked example.
Read guideCalculator Guides · 6 min read
How to Calculate Compound Interest (Formula & Example)
The compound interest formula, a worked ₹1-lakh example, and why compounding frequency and time do the heavy lifting.
Read guideCalculator Guides · 5 min read
How to Calculate BMI (Formula, Example & Categories)
The BMI formula in metric and imperial, a worked example, the WHO categories, and where BMI falls short.
Read guideCalculator Guides · 5 min read
How to Calculate GST (Add & Remove) — Formula & Examples
How to add GST to a price and how to back it out of a GST-inclusive amount — with formulas and 18% worked examples.
Read guideCalculator Guides · 5 min read
How to Calculate a Percentage (Formulas & Examples)
The three percentage formulas everyone needs — percent of a number, one number as a percent of another, and percentage change — with worked examples.
Read guideCalculator Guides · 6 min read
How to Calculate EMI (Formula, Example & Free Calculator)
The EMI formula explained, a worked ₹10-lakh loan example, and how rate and tenure change what you really pay.
Read guideCalculator Guides · 6 min read
How to Calculate SIP Returns (With Formula & Example)
The SIP future-value formula, a worked ₹10,000/month example, and why starting early matters.
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