Most Coast FIRE calculators stop at one number. Coast FIRE Planner finds the month you can stop saving for retirement, then tests that plan in 1,000 simulated markets to show your odds of success. What-if rows show how saving more, retiring later, lower returns or higher fees move your date. Also includes Barista FIRE, Coast FIRE number and FIRE number calculators. Free, no sign-up, your numbers stay in your browser, and every formula is published.