Expert guides on EMI, SIP, GST, BMI, TDEE, percentages, and more. India-first finance, health, and math tutorials reviewed by Mayra.
Every guide on the iCalcApp blog is written and reviewed by Mayra. Guides are linked directly to the relevant calculator so you can apply the formula immediately after reading.
Finance guides use India FY 2025-26 tax slabs, GST rates, and RBI guidelines. Health guides follow WHO and ICMR 2024 standards. All content is updated when regulations change.
I want to borrow smart: begin with how EMI really works — it explains why two loans with the same rate can cost differently, then the EMI vs loan vs amortization piece tells you which calculator fits your exact question. I want to grow money: compound interest first (the maths everything else builds on), then FD vs RD vs SIP for where to put monthly savings. I want to fix my health numbers: BMR vs TDEE answers the question most people get wrong — which number to eat by — and daily calorie needs turns it into a target.
Finance (20 guides): borrowing (EMI, debt payoff, mortgage vs rent), investing (SIP, compound interest, ROI/CAGR), India tax (GST series, income-tax adjacent HRA/gratuity coverage), and retirement (corpus planning, PPF/EPF/NPS). Health (13 guides): energy and weight (calories, TDEE, walking/running), body metrics (BMI limitations, body fat), and training (heart-rate zones, fitness tracking). Math & everyday (4 guides): percentages, age calculation, and grade curves. Every guide links its companion calculator so you can apply each concept as you read.
Every guide on this page pairs with a working calculator — the guide explains the formula, the rules, and the decision logic; the calculator does the arithmetic. The India finance cluster (EMI, GST, income tax, PPF/EPF/NPS, HRA, gratuity) reflects FY 2025-26 rates and Budget changes; health guides follow WHO and ICMR reference standards; and every comparison piece (FD vs RD vs SIP, PPF vs EPF vs NPS, BMR vs TDEE) ends with a worked decision framework rather than a vague “it depends.”
Borrowing: start with how Indian banks calculate EMI, then avalanche vs snowball payoff. Investing: compound interest → SIP vs lump sum → FD vs RD vs SIP. Retirement: the 5-step corpus plan → PPF vs EPF vs NPS. Tax: GST in India and GST calculation formulas. Health: BMR vs TDEE → daily calorie targets.
Every guide follows the same production standard: the formula or rule is traced to its primary source first (Income Tax Act sections, CBIC notifications, EPFO circulars, WHO/ICMR reference ranges, or the original peer-reviewed equation), worked examples are computed by hand and cross-checked against the matching calculator, and the draft is reviewed by Mayra (MBA Finance) before publication. Finance guides are re-verified after every Union Budget; health guides when WHO or ICMR guidance changes. Each page shows its last-reviewed date, and corrections ship within 48 hours under our editorial policy.
Three things. First, every claim is calculable — if a guide says a ₹20 lakh income owes ₹1,92,400 under the new regime, the income tax calculator will reproduce that number with the same inputs. Second, India-first specificity: GST slabs, FY 2025-26 tax rules, EPFO rates, and lakh/crore formatting are native, not an afterthought. Third, comparison guides end in decision frameworks with explicit break-even numbers — the PPF vs EPF vs NPS guide tells you which wins at which deduction level, not just "evaluate your goals."
The blog covers personal finance (EMI, SIP, GST, tax, budgeting, debt payoff), health and fitness (BMI, calories, TDEE, body fat, blood pressure), and mathematics (percentage, compound interest, statistics).
Yes. Finance guides are updated when Indian regulations change (GST rates, income tax slabs, EPF rules). Health guides are updated when WHO or ICMR publish revised guidelines.
Each guide explains the formula and concept behind a specific calculator. After reading, you can use the linked calculator to apply the formula to your own numbers instantly.
All blog content is written by Mayra, financial analyst, and reviewed for accuracy before publication.
Yes — all content is freely available. For academic or professional use, please cite iCalcApp and the specific calculator URL. Sources and methodology are documented at the methodology page.