Tools.
Run the numbers yourself.

89 interactive calculators covering Bitcoin, retirement planning, career decisions, equity compensation, tax strategy, debt, and personal finance. Every tool runs in your browser. No sign-up, no data collection, no tracking. Your numbers stay on your device.

This page covers US-specific accounts and tax law. Outside the US? The priority order is the same, the account names differ (ISA in the UK, TFSA/RRSP in Canada, Super in Australia, etc.).

Career Tools

Salary negotiation, career switching, equity compensation, severance.

Retirement & Wealth Tools

Track where you stand, check if you are on track, compare pension offers.

Tax Tools

Full estimation, bracket breakdown, optimization by contribution, tax-loss harvesting, Roth conversions.

Tax Estimator

W-2 form replica. Schedule C for self-employed. All 50 state brackets. 2026 federal brackets. LTCG, SE tax, QBI, NIIT, CTC. Bitcoin gains separated short and long. Projection slider. Shareable PNG. Honest disclaimer: estimation only.

Most comprehensive tool on the site
Paycheck Optimizer

Maxing your 401(k) costs less than you think. See exactly what pre-tax contributions do to take-home, broken down by paycheck.

2026 brackets
Tax Bracket Calculator

Break your income into every 2026 federal bracket. Effective vs marginal. Pre-tax 401(k) savings.

Quick lookup
Tax-Loss Harvesting

Volatility creates tax opportunities. See what harvesting a Bitcoin loss saves, then rebuying at the same price.

Also on: /bitcoin-taxes/
Roth Conversion Ladder

Year-by-year conversion plan. 5-year bridge funding, tax cost, and ACA subsidy interaction.

Also on: /roth-conversions/
Roth Conversion Calculator

Size the optimal single-year conversion to fill your current bracket without spilling into the next one. Break-even analysis included.

2026 brackets
Mega Backdoor Roth

Calculate your remaining mega backdoor Roth capacity. Works only if your plan allows after-tax contributions plus in-service rollovers.

Also on: /mega-backdoor-roth/
Roth Conversion Sweet Spot

Find the largest Roth conversion that keeps you inside your target federal bracket, without spilling into the next one.

Fill your bracket, no spillover
Backdoor Roth Pro-Rata

See exactly how much of your backdoor Roth conversion is taxable when you hold pre-tax IRA balances. The pro-rata rule, quantified.

Also on: /backdoor-roth/

Bitcoin Tools

Price, cost basis, fees, mining, supply, allocation.

Bitcoin DCA Calculator

Simulate dollar-cost averaging from any start date. See total return, BTC accumulated, and a portfolio chart.

Also on: /dollar-cost-averaging/
Bitcoin vs S&P 500

Pick a start date. See what Bitcoin and the S&P 500 returned side by side: total, CAGR, max drawdown. Lump sum or DCA.

Also on: /bitcoin/
Bitcoin DCA Backtest

What if you'd started DCA-ing on a specific date? Enter start date and amount. See total invested, BTC accumulated, current value, and CAGR.

Also on: /dollar-cost-averaging/
Bitcoin Cost Basis Tracker

Log purchases, see weighted average cost basis, unrealized gain or loss, and break-even price.

Saves to your browser
Bitcoin Allocation Risk

Enter your portfolio and BTC allocation. See scenarios: zero, flat, 10x, 100x. The zero test, quantified.

Also on: /bitcoin-allocation/
Tax-Loss Harvesting

Volatility creates tax opportunities. See what harvesting a Bitcoin loss saves, then rebuying at the same price.

Also on: /bitcoin-taxes/
Bitcoin Fee Estimator

How much will your transaction actually cost? UTXO count, address type, fee rate. SegWit vs Taproot vs Legacy.

Also on: /bitcoin-custody-levels/
UTXO Consolidation Analyzer

Consolidate now, or spend UTXOs individually later? See the break-even math on future fees.

Also on: /strategy/hardware-wallets/
Lightning vs On-Chain

When does Lightning save vs on-chain? Based on your payment size and the current fee environment.

Also on: /how-it-works/
Halving Countdown

Live countdown to the next halving. Supply curve from genesis to 2140. Mined vs remaining vs estimated lost.

Also on: /proof-of-work/
Solo Mining Calculator

Your real odds of finding a block. Per day, per year, in a lifetime. Powerball and lightning-strike comparisons.

Also on: /proof-of-work/
Satoshi ↔ USD Converter

Live three-way converter: sats, Bitcoin, and US dollars. See any amount of sats in USD right now.

Shareable
Bitcoin Allocation Range

Four questions on time horizon, drawdown tolerance, purpose, and situation. Get a defensible allocation range, not a single number.

Also on: /bitcoin-allocation/
Sats Accumulator

How long does monthly DCA take to hit a sat target? Timeline at a flat price and under a modest growth assumption.

Time to your sat goal

Retirement & FIRE

FIRE number, Roth ladders, Social Security, HSA, tax wrappers.

Bitcoin Retirement Planner

Project your retirement stack across bear, base, and bull BTC scenarios. Traditional only vs Bitcoin allocation.

Also on: /personal-finance/
FIRE Number Calculator

Lean, Standard, Fat. Years to reach with and without Bitcoin. The target and the path in one view.

Also on: /fire/
Roth Conversion Ladder

Year-by-year conversion plan. 5-year bridge funding, tax cost, and ACA subsidy interaction.

Also on: /roth-conversion-ladder/
Social Security Break-Even

62 vs 67 vs 70. At what age does delaying pay off? Cumulative lifetime benefit chart included.

Also on: /social-security-strategy/
HSA Triple-Tax Calculator

Pre-tax, tax-free growth, tax-free qualified withdrawals. HSA vs taxable over 10, 20, 30 years.

Also on: /tax-advantaged-accounts-compared/
Roth vs Traditional

Which tax wrapper wins for your bracket? Includes a Bitcoin-in-Roth scenario comparison.

Decision tool
72(t) SEPP Calculator

Calculate your 72(t) SEPP annual distribution under all three IRS-approved methods. Penalty-free early withdrawals, done right.

All three IRS methods
Social Security Bridge

Should you delay Social Security to 70? Break-even ages and the IRA cost of bridging the gap from your retirement date.

Also on: /social-security-strategy/
Withdrawal Sequencer

Year-one retirement withdrawal plan: which accounts to tap first and the tax cost, with IRMAA and RMD flags.

Which account first
Floor and Enjoy Planner

Calculate your retirement income floor gap, the portfolio needed to fund it, and what is left over to enjoy.

Cover the floor, enjoy the rest

Personal Finance

Net worth, paycheck, emergency fund, inheritance.

Cost of Living Calculator

Pick your city. Build your real budget. See income needed, savings rate, city comparisons, and where you sit vs local living wage. 75+ metros pre-populated from MIT, BLS, and Zillow data.

Saves to your browser
Portfolio X-Ray

Add all your accounts and holdings. See your actual total allocation across everything. Concentration warnings, asset location flags, sovereignty score.

Saves to your browser
Paycheck Optimizer

Maxing your 401(k) costs less than you think. See exactly what pre-tax contributions do to your actual take-home, broken down by paycheck.

Also on: /personal-finance/
Debt-to-Income Ratio

Your DTI determines mortgage qualification and rate. See where you stand and which debt payoff improves DTI most.

Also on: /saving-for-a-house/
Inflation Break-Even

How long until cash savings lose X% of purchasing power? Big bank vs HYSA vs SPAXX, visualized.

Also on: /banking/
Medicare Cost Estimator

Part B premiums + IRMAA + Part D + Medigap. The actual monthly cost of Medicare given your income.

Also on: /life-stages/in-retirement/
Opportunity Cost Calculator

That $50 dinner, $200 jacket, $1,200 vacation upgrade. What would it be worth if you'd invested it instead? Three return scenarios and a preset table of common trade-offs.

Also on: /spending-less/
Paycheck Allocator

Input your take-home pay and see where every dollar should go: 401(k), Roth, emergency fund, Bitcoin DCA.

Also on: /personal-finance/
Emergency Fund

Your real fixed costs. 3, 6, 9, and 12 month targets. Includes a saved-so-far progress bar.

Also on: /banking/
Net Worth Milestones

Where you are on the path. $1K through $10M+. Sovereignty score based on Bitcoin share.

Saves to your browser
Net Worth + Sovereignty Score

Track assets, liabilities, and Bitcoin allocation. Get a sovereignty score with actionable steps.

Saves to your browser
Mortgage vs Rent

Ben Felix 5% Rule. Includes opportunity cost of the down payment. Buy vs rent net worth over 5, 10, 20 years.

Also on: /saving-for-a-house/
House Savings Calculator

How long until you can afford a down payment. Rent-vs-buy check built in.

Also on: /saving-for-a-house/
Inheritance Calculator

Stepped-up basis math. Selling now vs holding until death. Estate tax exposure against the federal exemption.

Also on: /inheritance/
Financial Order of Operations

Five questions route you to the right step in the 9-step Financial Order of Operations. Know exactly what to fund next.

Find your next step
Deductible Coverage

Add up your auto, health, home, and other deductibles to find your Step 1 cash target, the buffer before everything else.

FOO Step 1 cash target
Budget Builder

Enter take-home and current expenses. Get a personalized budget with a percentage breakdown and adjustment guidance.

Personalized allocation
IRMAA Estimator

Estimate your 2026 Medicare Part B premium from MAGI two years prior. Cliff warnings before a small raise costs you a bracket.

Also on: /irmaa/
Refinance Break-Even

How many months until refinancing closing costs are recovered through a lower payment. Refinance only if you stay past it.

Months to recoup closing costs
NPV Decision Calculator

Net present value for three common calls: pay off debt vs invest, take the job, make the purchase. One honest number.

Should you do it?
Baby Cost Estimator

Most parents underestimate first-year baby costs by 40 to 60%. Birth, the leave gap, childcare, and gear, totaled.

First-year total

Debt & Spending

Debt payoff, credit cards, subscriptions.

Money & Rates

Compound interest, inflation, banking yield, tax brackets.

Compound Interest

Initial, monthly, return, years. The hockey stick, and what waiting 5 years costs you.

Also on: /investing-for-beginners/
Real Inflation Calculator

What your old budget costs today. Official CPI vs real per-category increases.

Also on: /the-problem/
Tax Bracket Calculator

Break your income into every 2026 federal bracket. Effective vs marginal. Pre-tax 401(k) savings.

Also on: /personal-finance/
Banking Yield Calculator

How much interest you give up by keeping savings at a big bank vs a HYSA.

Also on: /banking/
Lump Sum vs DCA

Have a lump sum to invest? Compare all-at-once to spreading across 6/12/18/24 months using real S&P 500 or Bitcoin history. See which wins and by how much.

Historical backtest
Money Market After-Tax Yield

Compare SPAXX, FZFXX, FDLXX, HYSAs, T-bills, and CDs on an after-tax basis given your federal and state bracket.

Also on: /cash-management/
CD Ladder Builder

Build a CD ladder with 3 to 7 rungs. Per-rung interest, blended yield, and a reinvestment schedule.

3 to 7 rungs
Real Return Calculator

Enter any nominal rate and inflation assumption to see real return, lost purchasing power, and the true after-inflation yield.

Also on: /cash-management/
Treasury Yield Curve Viewer

See the US Treasury yield curve across maturities. Normal, flat, or inverted, the shape that has preceded recessions.

Normal, flat, or inverted
M2 Money Supply Tracker

When M2 grows faster than output, prices follow with a 12-to-18 month lag. The historical relationship, charted.

M2 vs inflation
Monetary Velocity

Same money supply, different velocity, different economy. The Wörgl experiment and the equation of exchange, visualized.

The Wörgl experiment

Have an idea for a tool? shrimpstacked@fiatisfake.org

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