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📝 Guides & Formulas

Calcivus Blog

Step-by-step guides, formula explanations, and how-to articles — with free working calculators built in.

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Finance
How to Calculate Compound Interest (Formula + Examples)
Master A = P(1 + r/n)^nt with real-world examples, monthly breakdown, and a free interactive calculator.
📖 5 min readJan 2026
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Health
BMI Chart by Age and Height — Complete Guide 2026
Understand BMI ranges for men, women, and children. Includes full chart, limitations, and free calculator.
📖 7 min readJan 2026
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Math
How to Calculate Percentage — 3 Methods Explained
Learn percentage of a number, percentage change, and what percent one value is of another with examples.
📖 4 min readJan 2026
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Finance
EMI Calculation Formula — Home Loan & Car Loan Guide
Learn the EMI formula P×r×(1+r)^n/((1+r)^n-1) with worked examples for home loans and car loans.
📖 6 min readJan 2026
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Engineering
Ohm's Law Explained — Formula, Examples & Calculator
V = IR made simple. Understand voltage, current and resistance with practical examples and an interactive calculator.
📖 5 min readJan 2026
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Health
What is TDEE? Complete Guide to Total Daily Energy Expenditure
Learn how to calculate your TDEE, the difference from BMR, and how to use it for weight loss or muscle gain.
📖 6 min readJan 2026
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Education
How to Calculate GPA — Complete Guide with Formula
Understand GPA on a 4.0 scale, how grade points are assigned, and how weighted GPA is calculated each semester.
📖 5 min readJan 2026
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Finance
How Much Do You Need to Retire? The 4% Rule Explained
The 4% rule, compound growth, and how to calculate your retirement nest egg with our free retirement calculator.
📖 7 min readJan 2026