See what your money does when you give it time.
Free calculators and the real math behind every “$1M or…?” video. Type a number, watch it grow, share the link.
8% ≈ the long-run stock market average. Not a promise.
Pick a number. Watch it grow.
Every calculator is free, instant, and shareable: change a number and the link updates so you can send a scenario to anyone.
Compound interest calculator
“$X a month for Y years”: see exactly what it turns into, with a chart you can share.
Open calculator →Millionaire by age calculator
How much to invest each month to hit $1M by 40, 50 or 60.
Open calculator →$1M or…? dilemma calculator
A lump sum today vs. payments over time (or a penny doubled). The channel’s signature question, with real math.
Open calculator →S&P 500 “what if I invested” calculator
What $100 a month in an S&P 500 index fund would have grown to, using honest historical averages.
Open calculator →Coast FIRE calculator
The number where you can stop saving and let compounding finish the job, by age.
Open calculator →Daily habit cost calculator
What a $6-a-day habit really costs over 30 years if that money were invested instead.
Open calculator →The math behind the big money questions
How Do You Become a Millionaire in One Year
How do you become a millionaire in one year? Saving it takes about $80,322 a month at a hypothetical 8%.…
Read the guide →GuideMoney Market Account vs Savings Account
Money market account vs savings account: rates, access, minimums and FDIC coverage compared, with $10,000 worked out at today's average…
Read the guide →GuideGifts for Someone Who Is Bad With Money
Gifts for someone bad with money: friendly money books, a cash envelope wallet, a budget planner and a cash gift…
Read the guide →GuideHow Much to Spend on Christmas Gifts
How much to spend on Christmas gifts: take the cash you will have by December 25, subtract travel and food,…
Read the guide →GuidePay Off Debt or Invest? The Rate Test, With Math
Pay off debt or invest? Compare the debt's rate with a realistic return. See $15,000 at 22%, 8% and 4%…
Read the guide →GuideHow Long Will My Savings Last? Withdrawal Tables by Rate
$500,000 at $3,000 a month lasts about 14 years with no growth and about 24 years at a hypothetical 5%.…
Read the guide →GuideBest Personal Finance Books: 13 Classics by Goal
Best personal finance books, compared and ranked by goal: 13 classics for budgeting, investing, FIRE and debt, with who each…
Read the guide →GuideHow to Save a Million Dollars in 10 Years
To save $1 million in 10 years from $0, you need about $5,467 a month at a hypothetical 8%. See…
Read the guide →GuideHow Long Does It Take to Pay Off Student Debt?
Federal student loans take 10 years on the standard plan, up to 25 on newer tiers. See how $20,000 at…
Read the guide →GuideHow to Start an Amazon FBA Side Hustle
How to start an Amazon FBA side hustle: real startup costs with sources, a checked $2,060 example budget, per-unit profit…
Read the guide →GuideHow to Double Your Money: Rule of 72 Math by Rate
How to double your money: divide 72 by your return. At 8% it doubles in about 9 years, at 10%…
Read the guide →GuideWealth Multiplier by Age: What $1 Becomes by 65
Wealth multiplier by age: $1 invested at 25 grows to about $21.72 by 65 at a hypothetical 8%. Full table…
Read the guide →$1M or…? Which would you take?
The questions from the channel, with the full math behind the answer. Most people pick wrong.
60 seconds of money math
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