BedrockCalc Blog

One plain-English guide per topic — the concepts, formulas and trade-offs behind the calculators, with worked examples. No jargon, no fluff.

Mortgage & Home

Everything for buying, financing and owning a home — from the monthly payment to refinancing, affordability and rental returns.

Finance or lease a car, truck or boat: real monthly payments with tax, trade-in and fees, plus buy-vs-lease and rebate-vs-rate comparisons.

Personal, student and business loans, credit-card payoff, debt consolidation and the ratios lenders use to size what you can borrow.

Grow an emergency fund, hit a savings goal, budget a month or plan for college — see how consistent saving compounds over time.

Project returns and compare opportunities: present and future value, IRR, ROI, bonds, funds, fees and dollar-cost averaging.

Map the road to retirement — 401(k)s, IRAs, pensions, Social Security, annuities and how long your nest egg lasts.

Everyday money and small-business math: take-home pay, commissions, discounts, margins, depreciation and net worth.