Practical guides for tools people actually use.
Step-by-step guides for money, invoices, QR codes, budgeting and everyday business workflows, paired with free CalculatorAI tools so you can act immediately.
Latest collection
Updated Jul 29, 2026
Short guides with the calculator, tracker or document tool already attached.
Read the decision, avoid the common mistake, then open the exact tool that handles the work.
How to Calculate Capital Gains Tax (US Stock & Crypto)
How is capital gains tax calculated in the US? Learn short-term vs. long-term rates, wash-sale rules, and how to report stock and crypto sales.
CalculatorAI Team · Jul 29, 2026
Read the guideTool Handbooks & Guides
How to Maximize Your 401(k): Match & Contribution Rules
How does a 401(k) employer match work? Learn contribution limits, vesting rules, tax choices, and strategies to maximize your retirement savings.
What Salary Do You Need to Buy a Home? Six Countries Compared
We ran the same mortgage on official data from six countries. The US has the cheapest housing per square metre in the study — and one of the heaviest burdens.
Portfolio Diversification: How to Measure Yours (and Actually Improve It)
Diversification is more than owning many stocks. Learn what real diversification looks like, how to measure your concentration, and how to fix it.
How to Track Your Investment Portfolio (Without a Spreadsheet)
Stop guessing what your portfolio is worth. A simple system to track holdings, cost basis, gains and allocation — free, no spreadsheet.
Win Rate, Risk-Reward and Expectancy: The Only Trading Math That Matters
You can win 40% of trades and still be profitable. Learn how win rate, risk-reward and expectancy combine — and how to compute yours.
How to Keep a Trading Journal (What to Track + Free Template)
A trading journal is the fastest way to stop repeating losing trades. Learn exactly what to log, the metrics that matter, and how to review it.
What Your Daily Habits Actually Cost You in a Year
A $6 daily coffee is $1,560 a year and $22,500 over a decade if invested. See what everyday habits really cost — and how to cut the ones not worth it.
Debt Snowball vs. Debt Avalanche: Which Pays Off Faster?
Snowball vs. avalanche run on the same four debts: which saves more interest, which keeps you motivated, and how to choose. With free payoff calculators.
How to Do a Subscription Audit (and Cancel What You Forgot)
A 30-minute subscription audit: find every recurring charge across five hiding places, price each one per year, and cancel what you never use. Free calculator.
How to Track Rental Income and Expenses for Taxes
What to track for rental taxes: deductible expenses, repairs vs. improvements, depreciation, mileage and the records Schedule E needs — without a spreadsheet.
The 50/30/20 Budget Rule: How to Split Your Paycheck
The 50/30/20 rule splits your take-home pay into needs, wants and savings. Learn how to calculate it with an example, and how to actually stick to it.
How to Invoice a Client as a Freelancer (Free Template)
A clear, step-by-step guide to invoicing clients as a freelancer — what to include, how to set payment terms, and how to get paid on time. Free invoice tool.
How to Make a Digital Business Card with a QR Code (Free)
Create a free digital business card as a QR code — people scan it and your contact saves straight to their phone. No app, and you can edit it anytime.
How to Create a QR Code Menu for Your Restaurant (Free, No App)
Make a free QR code menu for your restaurant in minutes — no app, no monthly fee. Print it once, then edit the menu anytime without reprinting.
More practical guides are coming.
New walkthroughs will keep the same format: plain-English steps, honest tradeoffs and direct links to the working tool.