Financial Independence Retire Early (FIRE) - Definition, Types
Coast FIRE Calculator, Flamingo FI & Traditional FIRE Calculator - Download Our All-in-One Semi-FI Calculator! - Money Flamingo - FIRE & Lifestyle Blog
4 FIRE levels (Financial Independence retire Early)
The Shockingly Simple Math Behind Early Retirement | Mr. Money Mustache
Early Retirement Calculators and Tools - Engaging Data