Budget Tools

Nine calculators that run in your browser: the 50/30/20 split, subscriptions, paycheck, emergency fund, net worth, housing, debt, investing, and crypto. What you type stays on this device unless you turn on saving to your account.

Educational estimates only — not financial advice. These calculators use simplified assumptions and don't know your full situation. Check important decisions with a licensed financial professional.

Private by default

Saved on this device.

No account needed to start. Sign up to save your numbers so they are still there on your next phone.

Subscription stack

Track recurring bills, monthly and yearly burn, and what share of take-home they eat.

Monthly $0
Yearly $0 —
For percent of income only.

Quick add

Your subscriptions

50/30/20 split

The starter budget. 50% needs, 30% wants, 20% savings and debt payoff. Enter your take-home to see your targets.

An illustration, not a law, and not a split this page assigns to you.

Your monthly targets

Budgeting module →

Paycheck sanity check

Subtract pre-tax deductions, apply an effective tax rate, and see net pay — quick estimate, not a payroll engine.

Stays in investments/benefits — not spendable cash.
28%

Estimated net / mo

$0

Applies an effective tax rate to your post-pre-tax income — not a payroll calculation.

Take-home $0 Taxes & benefits $0 Pre-tax $0

Emergency fund timer

Goal, what you have now, and what you add monthly — months to the finish line.

Progress

0% of goal · — to go

~— at this pace

Excludes interest — measures contribution pace to a fixed goal.

Milestones at this pace

Most people sleep better at one month saved than at zero, then stretch toward three to six months of must-pay bills.

Budgeting module →

Rent vs buy (monthly)

Mortgage payment + tax + insurance vs rent — closing costs and appreciation not modeled.

Rough monthly carry

$0

Mortgage + tax + ins

vs rent $0

—

Compares core monthly cost — excludes PMI, deductions, moving costs, and price changes.

Rent vs buy module →

APR bleed clock

Estimated monthly interest if you revolve a balance — simple APR÷12 approximation.

Interest drift

About $0.00 / month · $0.00 / year

Payoff planner

See months to $0 and total interest — fixed payment or a shrinking-minimum model.

Time to $0 —
Interest paid —
Principal + interest —
Balance trajectory

Fixed-balance amortization — excludes new charges, fees, and promo rates.

Credit module →

Investment growth calculator

See how compound interest turns regular contributions into real wealth over time.

Your projected outcome

Final value —
Total contributed —
Interest earned —
Balance over time

Assumes a constant rate, monthly compounding, and no taxes or fees.

Investing module →

Drawdown stress test

Volatility is the feature — sizing is the homework.

40%

Rough dollar hit

$0

—

Estimates dollar exposure if crypto drops by the chosen percentage.

If crypto falls this far

For scale: Bitcoin fell about 73% in 2018 and about 64% in 2022. Both took years to recover.

Open crypto foundations →

Net worth

Everything you own minus everything you owe. The one number that tracks real progress.

What you own

What you owe

Net worth

$0

$0 owned minus $0 owed

Budget Tools saves to this device. Signed-in members can turn on a private copy on their account. You can download a spreadsheet of what you typed at any time.