Free Online Calculators
Finance, FIRE planning, real estate, health, education, and everyday math. No signup. No tracking. Just tools that work.
Finance Calculators
401(k) Employer Match Calculator
See how much employer match you're capturing, what you're leaving on the table, and the long-term cost of uncaptured free money
Capital Gains Tax Calculator 2026
Calculate your federal capital gains tax, NIIT surcharge, and state tax — with a full bracket breakdown
Dividend Reinvestment (DRIP) Calculator
See how reinvesting dividends compounds your share count and portfolio value vs. taking dividends as cash
FIRE Calculators
Barista FIRE Calculator
Find the portfolio size you need to semi-retire — combining part-time income with smaller portfolio withdrawals
Mega Backdoor Roth Calculator
Find your available contribution space and see how tax-free growth stacks up against a taxable account
Roth Conversion Calculator 2026
See whether converting traditional IRA or 401(k) funds to Roth makes sense — and how much you'd gain or lose based on your current vs. expected retirement tax rates
Real Estate Calculators
Closing Costs by State 2026
Average buyer closing costs for all 50 states — with a free itemized calculator
Property Tax by County 2026
Find the effective property tax rate for your county — with a calculator to estimate your annual bill
Rent vs. Buy Calculator 2026
Compare your net worth from buying a home vs. renting and investing the difference — with a break-even year and full monthly cost breakdown
Health Calculators
Heart Rate Zone Calculator for Running
Find your 5 training zones using max HR or the Karvonen method with resting heart rate
Hydration Calculator by Weight
Find your daily water intake based on weight, activity level, and climate
Running Pace Calculator
Calculate pace, finish time, or distance — plus race time predictions for 5K to marathon
Online Tools
JSON to CSV Converter — Free Online Tool
Paste JSON, get a CSV file — handles arrays, nested objects, and missing keys instantly
Reading Time Calculator for Articles
Paste your text to get reading time, word count, and speaking time instantly
Words Per Page Calculator
Find how many words fit on a page — or how many pages your word count fills