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Finance, investment, and planning calculations — explained and demystified.
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Flat Rate vs Reducing Balance: The Same 7% Costs Double
The Rule of 72: The Fastest Way to Estimate Compound Interest Without a Calculator
Divide 72 by the interest rate and you get the approximate years for money to double. At 8%, that's 9 years. At 6% inflation, your purchasing power halves in 12 years. The Rule of 72 is the fastest compound interest mental shortcut — here's how it works, why it's accurate, and how to extend it to tripling, quadrupling, and GDP growth.
SIP vs Lump Sum Investing: What the Evidence Shows and Why Staying Invested Beats Everything Else
Lump sum beats SIP 67% of the time theoretically — and SIPs almost always win in practice, because most people don't have a lump sum, and those who do often never invest it. Here's what the research shows, the cost of missing the market's best days, and what a 15-year SIP actually produces.
Recurring Deposits vs SIPs vs Savings Accounts: Risk, Returns, and Which Suits Your Goal
RDs guarantee returns; SIPs offer higher potential returns with market risk; regular savings accounts provide full liquidity. Here's a comparison of all three by risk, return, tax treatment, and suitable horizon — including why rupee cost averaging makes SIPs particularly effective in volatile markets.
Goal-Based Savings Planning: How to Set Realistic Targets for Emergency Funds, Deposits, and Education
Most savings goals fail because the monthly target was calculated wrong — no inflation adjustment, no allowance for rising house prices, wrong timeline. Here's goal-based financial planning in practice: emergency fund sizing, inflation-adjusted targets, house deposit calculation with rising prices, and education fund planning.
How Income Tax Brackets Actually Work: Progressive Tax, UK's Hidden 60% Band, and Effective vs Marginal Rates
Tax brackets don't apply to all your income — only to the income in that band. Here's exactly how progressive tax works with UK and US examples, the UK's hidden 60% tax band between £100k–£125k, why National Insurance is effectively a second income tax, and the difference between marginal and effective rates.
Fixed Deposits vs Government Bonds, Money Market Accounts, and Premium Bonds: Which Low-Risk Option is Right?
Fixed deposits compete with government bonds, money market accounts, and UK Premium Bonds for the same conservative savings money. Here's how each works, the inflation-adjusted real return calculation, when Premium Bonds beat FDs for higher-rate taxpayers, and how to choose based on liquidity needs.
Treasury Bills, Yield Curves, and Simple Interest: How Short-Term Government Debt is Priced
Treasury bills are priced using simple interest on a discount model — you pay less than face value and receive face value at maturity. Here's how T-bill discount rates work, the yield curve and what inversions signal, real vs nominal yields, and how simple interest appears in overdrafts and trade credit.
Retirement Calculator — Find Your Actual Corpus Target Before It's Too Late
Learn why most retirement estimates are too low, how inflation and longevity compound the planning challenge, the key variables that determine your target corpus, and how a free retirement calculator gives you a defensible number.
RD Goal Calculator — Find the Exact Monthly Deposit for Any Savings Goal
Learn how to work backwards from any savings target to a specific monthly deposit, plan multiple goals simultaneously, and adjust timelines when the monthly amount exceeds budget — with a free RD goal calculator.
Loan Planner — Master Your Amortisation Schedule & Prepayment Strategy
Learn how to read an amortisation schedule, find the crossover point where principal beats interest, why prepayment timing matters, and how to use a free loan planner to take control of any loan.
EMI Calculator — How to Reduce Your Total Loan Cost with 3 Levers
Learn how EMI is structured, why early prepayment saves the most, and how to use the three levers — principal, rate, and tenure — to reduce your total loan cost, with a free EMI calculator.
Simple Interest Calculator — Understand Flat-Rate Loans and Their True Cost
Learn how simple interest differs from compound interest, where it's still used in modern finance, why flat-rate loans cost far more than their headline rate suggests, and how to use a free simple interest calculator.
