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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. Nothing you type leaves this device.

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.

Subscription stack

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

Monthly $0
Yearly $0
For % of income only — stays on this device.

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.

A guideline, not a law. High cost-of-living cities often run closer to 60/20/20.

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

JagInsights Budget Tools runs locally in your browser. Your inputs can be saved on this device only. Nothing is uploaded.