Free Online Calculators, Converters & Tools
Accurate, private, and always free. Every calculation runs in your browser — no sign-ups, no data collection.
Popular Calculators
401(k) Calculator
Plan your employer-sponsored retirement savings with inflation-adjusted projections.
Age Calculator
Determine age in years, months, weeks, and days. Leap years and month lengths handled. Total months, weeks, days, hours, minutes, seconds.
Amortization Calculator
Detailed month-by-month breakdown of principal and interest with 2026 interest-efficiency tracking.
Auto Loan Calculator
Calculate monthly car payments, total interest, and trade-in impact with 2026 equity tracking.
BMI Calculator
Calculate your Body Mass Index based on height and weight.
Calorie Calculator
Calculate daily calorie needs using Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formulas. Get TDEE, target intake for weight loss/gain, macro splits, and zig-zag calorie cycling schedules.
Compound Interest Calculator
Compound growth with flexible contribution and compounding schedules, optional employer match and contribution increases, inflation-adjusted results, and shareable links.
Credit Cards Payoff Calculator
Plan for paying off multiple credit cards.
House Affordability Calculator
Compare how much house you can afford with Conventional, FHA, and VA loans. Includes PMI, closing costs, HOA, and a stress test.
Income Tax Calculator
Calculate your 2026 federal income tax liability. Includes 2026 brackets, new senior deductions, FICA taxes, and tax refund estimation.
Loan Calculator
Work out monthly payments and total interest for standard, deferred, or bond-style loans. Add extra paydowns and compare APR and APY in one place.
Mortgage Calculator
Advanced P&I breakdown including PMI, taxes, and risk sensitivity analysis.
Mortgage Payoff Calculator
See how extra monthly payments, lump sums, or biweekly payments can help you pay off your mortgage early.
Percentage Calculator
Quickly solve percentage-based math problems.
Retirement Calculator
Estimate how much you need to save for retirement.