Calculate, read and choose better
Free tools to understand the numbers, measure your reading, improve your writing and find the right next book.
Financial calculators
Compound Interest Calculator
Project future value from recurring investments, including fees and inflation.
Open calculator → ROI · CAGRInvestment Return Calculator
Calculate ROI, net profit, CAGR and annualized investment return.
Open calculator → FIREFIRE Calculator
Estimate the portfolio needed for financial independence based on your spending.
Open calculator → 2026Gross to Net Salary
Estimate take-home pay after tax in the US, UK, Canada, Australia and New Zealand.
Open calculator → DCA · LUMP SUMDCA Calculator
Model recurring investments with fees and inflation, then compare them with a lump-sum strategy.
Plan your DCA → WHAT-IFSavings Goal Calculator
Find your finish date, required monthly savings and test scenarios with a live slider.
Build your savings plan →Tools for readers and writers
Reading Speed Test
Measure WPM, check comprehension and get a suggested audiobook speed.
Start the test → Flesch · FogReading Level Checker
Analyze grade level, reading ease, sentence length and complex words.
Analyze text → 6 questionsBook Recommendation Quiz
Get three personalized matches linked directly to real book pages.
Find your next book → LiveCharacter & Word Counter
Count characters, words, sentences and paragraphs, plus reading and speaking time.
Count your text → Myers DiffText Diff Checker
Highlight words and punctuation added, removed or unchanged between two versions.
Compare text →