ToolSelf Blog
Guides on taxes, finance, business, and practical tools for freelancers and everyone.
Mortgage Pre-Approval vs Pre-Qualification: What is the Difference?
Pre-qualification is a back-of-envelope estimate. Pre-approval is a real conditional commitment from a lender — sellers care about the difference.
Salary to Hourly: Convert Your Annual Salary
Want to know your true hourly rate? This simple formula converts annual salary to hourly wage, accounting for actual working hours.
Why Online Calculators Beat Spreadsheets for Quick Math
Spreadsheets are powerful and dangerous. For one-off calculations, a purpose-built calculator is faster and harder to mistype.
Home Office Deduction: Maximize Your Tax Savings
The IRS lets you deduct your home office. Two methods explained: simplified ($5/sqft) vs actual expenses.
Heart Rate Zones: Train Smarter, Not Harder
Zone 2 builds aerobic base. Zone 5 burns out beginners. Knowing your zones turns every workout into a deliberate stress.
Scaling Your Freelance Business: From Solo to Team
At some point, you might want to hire. Here's what changes when you move from solo freelancer to small agency owner.
How to Calculate Your Freelance Hourly Rate in 2026
Stop underpricing your work. Learn the exact formula to calculate what you should charge per hour based on your target income, taxes, and expenses.
Loan Amortization: Understanding Your Mortgage Payment
Your mortgage payment is mostly interest at first, with principal increasing over time. Here's how amortization works.
Break-Even Calculator: Know Your Minimum Earnings
Before you launch a product or service, calculate your break-even point. How many sales do you need just to cover costs?
Tip Calculator: Fair Tipping Guide for 2026
15%, 18%, 20%? Here's a quick guide to fair tipping at restaurants, bars, salons, and other service businesses.
HTTP Status Codes: The 15 You Actually See in Production
You will not see 418 in your logs. You will see lots of 200, 301, 401, 404, 422, 429, 500 and 502.
PDF to Word Conversion: When It Works and When It Fails
Text-based PDFs convert cleanly. Scanned PDFs need OCR first. Here is how to get usable Word docs from any PDF.