CalcBeam Blog
Short, practical posts on the calculations people search for most.
Learn exactly how your loan EMI really works: the amortization formula, why early payments are mostly interest, and how extra paym
The rule of 72 turns any interest rate into years-until-doubling. Learn the math, see worked investing examples, and use it agains
Think 20% + 10% off equals 30% off? It is really 28%. Learn why stacked discounts multiply instead of adding, with real store exam
BMI is a useful screening tool with real blind spots. Learn what body mass index gets right, where it misleads, and the two simple
A $60,000 salary is not really $28.85 an hour. Convert salary to hourly the honest way: PTO, holidays, taxes, benefits, hidden per
APR is what borrowing costs; APY is what savings earn. Learn the compounding math behind both, with credit card and mortgage examp
Debt snowball vs avalanche, run on the same debts with real numbers: which saves more interest, which keeps you motivated, and a h
The 4% retirement rule promises 30 years of safe withdrawals. Learn where it came from, when sequence risk breaks it, and how to a
One mortgage point costs 1% of the loan for about 0.25% off the rate. Learn the breakeven math, when points win or lose, and the l
Three to six months of expenses is the rule, but your number depends on your job, household and backup plans. Learn to size, build
Compound interest turns small, steady savings into serious wealth. Learn the formula in plain English with real numbers, and why s
Learn exactly how GPA is calculated, the difference between weighted and unweighted scales, plus a full worked semester example wi
A clear step-by-step guide to calculating zakat on wealth: the 2.5% rate, nisab thresholds, what counts, what to deduct, and a com
Master tipping math with simple mental tricks: the 10% anchor method, quick 15/18/20/25% calculations, bill-splitting, and US tipp
The 50/30/20 budget rule explained practically: what counts as needs vs wants, a real $4,500 paycheck walkthrough, and how to adap
Set a freelance hourly rate with math, not guesswork. The salary-replacement formula, billable hours reality, costs, taxes, and wh
Inflation silently shrinks your savings every year. See the real math on $100,000 over 20 years, why savings accounts lose, and wh
Planning a concrete patio? Learn to calculate cubic yards for any slab, add the right waste factor, choose bags vs ready-mix, and
EV vs petrol compared on total cost of ownership: fuel, charging, maintenance, purchase price, insurance, and the honest break-eve
Everyday unit conversions in one place: length, weight, kitchen volumes, temperature, and road speed, with exact factors and quick