The CalculatorXP Blog

Finance6 min read

How Compound Interest Works — The Most Powerful Force in Finance

Einstein called it the eighth wonder of the world. Here's what it means and why starting early makes such a huge difference.

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Maths7 min read

How to Calculate Percentage — Every Type Explained Simply

From 'what is 15% of 80' to percentage change and reverse percentages — every type explained with examples.

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Finance5 min read

How Mortgage Payments Are Calculated

Most people pay a mortgage for 25 years without knowing how the monthly figure is worked out. Here's the formula.

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Finance5 min read

Understanding Tax Brackets — Why Earning More Never Means Taking Home Less

The most common misconception in personal finance, explained clearly with examples.

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Finance4 min read

The 50/30/20 Rule — A Simple Framework for Any Budget

Needs, wants and savings. How this one rule simplifies budgeting for almost any income level.

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Health6 min read

BMI — What It Measures, What It Doesn't, and What to Do With the Number

A balanced look at BMI — its formula, where it's useful, and its well-known limitations.

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Health6 min read

How Many Calories Do You Actually Need?

The science of BMR, TDEE and activity multipliers — how to find your personal calorie requirement.

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Science5 min read

The Metric System vs Imperial — Why the World Is Split

Why most countries use metric but the US still uses imperial — the history and practical differences.

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Maths7 min read

Probability Explained — From Coin Flips to Card Games

What probability means, how to calculate it, and why the Gambler's Fallacy catches everyone out.

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Science6 min read

How to Read the Periodic Table

What every number, symbol and position tells you. Groups, periods and trends explained clearly.

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Finance6 min read

What Is Inflation and How Does It Affect Your Money?

What causes inflation, how it's measured with CPI, and what it does to the real value of your savings.

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Finance5 min read

How to Build an Emergency Fund — and Why It Matters

What an emergency fund is, how much you actually need, where to keep it, and how to build one.

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Finance5 min read

What Is a Good Credit Score and How Is It Calculated?

Credit scores explained — what they measure, the five factors, what counts as good, and how to improve yours.

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Finance7 min read

Renting vs Buying a Home — The Real Financial Comparison

A clear-headed look at both sides — the hidden costs of buying, the advantages of renting, and when each makes sense.

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Finance4 min read

What Is ROI and How Do You Calculate It?

Return on Investment explained — the formula, a practical example, its limitations and when to use annualised ROI instead.

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Health6 min read

How Sleep Works — and How to Calculate Your Ideal Bedtime

Sleep cycles, what happens in each stage, why waking mid-cycle feels awful, and how to time your alarm right.

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Health6 min read

Understanding Macros — Protein, Carbs and Fat Explained

What each macronutrient does in the body, how many grams you need, and how to set targets for your goals.

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Health5 min read

Heart Rate Zones Explained — How to Train Smarter

The five heart rate zones, what happens in each, and the 80/20 principle elite athletes use.

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Health5 min read

Body Fat Percentage vs BMI — Which Tells You More?

Two people can have identical BMIs but very different health profiles. Here's when body fat percentage gives you more.

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Health5 min read

Running Pace Guide — What Your Speed Actually Means

How running pace works, what different zones mean for training, and how to predict race times.

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Maths6 min read

What Is Standard Deviation and Why Does It Matter?

Standard deviation explained simply — what it measures, the 68-95-99.7 rule, and why it matters in finance.

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Maths5 min read

The Pythagorean Theorem — Explained with Real-World Uses

The famous a²+b²=c² explained with real-world applications from construction to GPS.

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Maths6 min read

How Fractions Work — Addition, Subtraction, Multiplication and Division

A complete guide to fraction arithmetic with clear step-by-step examples for each operation.

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Science6 min read

The Speed of Light — What It Is and Why Nothing Can Go Faster

Why 299,792,458 m/s is the universe's speed limit — and what happens as you approach it.

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Science5 min read

Newton's Three Laws of Motion — Explained with Everyday Examples

Inertia, F=ma, and action-reaction explained with everyday examples.

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Science5 min read

How Electricity Works — Current, Voltage and Resistance Explained

The three fundamentals of electricity explained intuitively — and how Ohm's Law ties them together.

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Science5 min read

How GPS Works — The Science Behind Your Location

How satellites, trilateration and atomic clocks combine to pinpoint your location.

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Science4 min read

Why Is the Sky Blue? The Science of Light Scattering

Rayleigh scattering, red sunsets and black space — all explained through the physics of light.

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