Your next decision, made clearer

Find the right
starting point.

Eight calculator pages, practical guides, three original calculation studies, and the formulas behind them. Choose the question you need to answer—not just the number you want to see.

What are you working on?

14 tools and guides

01 / Home calculator

Mortgage & monthly costs

Separate the loan payment from tax, insurance, HOA, and PMI. Compare extra payments and download the amortization schedule.

See your all-in payment 02 / Home worksheet

What fits your budget?

Build a housing ceiling from take-home pay after debts, essentials, protected savings, and your own buffer.

Check your cash flow 03 / Home worksheet

Cash to close

Count the down payment, closing costs, prepaids, and moving costs. Subtract paid deposits and check the cash left afterward.

Plan your upfront cash 04 / Home comparison

Rent or buy?

Compare modeled rent with net ownership costs over the same period, including sale costs and three appreciation scenarios.

Compare both paths 05 / Car calculator

Auto-loan breakdown

Reconcile price, trade-in value, old-loan payoff, tax, fees, and cash down before comparing loan terms.

Inspect the car deal 06 / Savings calculator

Your savings goal

Project a balance, solve for the monthly deposit needed, and compare beginning- versus end-of-month contributions.

Build a savings plan 07 / Investment calculator

Long-term scenarios

Compare lower, base, and higher return assumptions. See the effect of fees, inflation, and growing contributions.

Explore a range of outcomes 08 / Reserve calculator

A reserve that fits your life

Translate essential expenses and household risks into a cash-reserve target, then test the time needed to build it.

Calculate your emergency reserve Read / Calculation guide

How compounding works

Follow a worked calculation and see why rate conventions and deposit timing can change an otherwise identical example.

Understand the formula Read / Investment guide

Choose better assumptions

Distinguish gross from net returns and future dollars from today's purchasing power. Stress-test a range instead of a forecast.

Read the assumptions guide Reference / All calculators

Check the mathematics

Inspect formulas, rounding conventions, downloadable test cases, model exclusions, and the correction history.

Open the methodology Original / Calculation study

When the housing answer reverses

Compare cash cost with equal-budget investing and follow each year of one reproducible housing case.

Reproduce the analysis Original / Calculation study

A lower payment can cost more

Separate the effects of rate, fees and repayment term in two independent written-offer scenarios.