無料オンライン計算機｜BMI・ローン・住宅ローンなど
FreeAIBoxの無料計算ツールで数値を瞬時に計算。BMI算出、ローン・住宅ローン返済額の試算、割合計算、正確な年齢計算、日付差計算、GPA計算、給与換算、AdSense収益予測まで。すべて完全プライバシーでローカル処理。学生・住宅所有者・求職者・フリーランサーなど、素早い計算が必要な方に。
40 ツールが利用可能
Financial Calculators
Plan your finances with loan, mortgage, retirement, investment, tax, and savings calculators.
Date & Time Calculators
Calculate date differences, time durations, age, and pregnancy due dates.
Health & Fitness Calculators
Track your health with BMI, TDEE, calorie burn, protein intake, BAC, and strength calculators.
Math & Statistics Calculators
Solve math problems with percentage, GPA, average, fraction, margin, discount, and tip calculators.
Unit & Conversion Calculators
Convert between measurement units and convert height between imperial and metric systems.
Construction & Home Calculators
Plan home projects with square footage, volume, and concrete calculators.
Money & Business Calculators
Calculate salary conversions, paycheck deductions, and online earnings.
Frequently Asked Questions
What calculators does FreeAIBox offer?
FreeAIBox offers 40 free online calculators covering financial planning (loan, mortgage, retirement, 401k, Roth IRA, RMD, SIP, FD, compound interest, inflation, emergency fund, CD, income tax, paycheck), health and fitness (BMI, TDEE, calorie burn, protein, BAC, one rep max), date and time (date difference, time duration, day calculator, age, pregnancy due date), math and statistics (percentage, GPA, average, fraction, margin, discount, tip), unit conversion (unit converter, height), and construction (square footage, volume, concrete).
Are these calculators really free to use?
Yes, all 40 calculators on FreeAIBox are completely free with no hidden charges, premium tiers, usage limits, or sign-up requirements. You can use every calculator as often as you need without any restrictions.
Is my data private when using these calculators?
Yes. Every calculator runs entirely in your browser using JavaScript. Your data never leaves your device — no information is stored on or sent to any server. This means complete privacy for sensitive calculations like income, health data, and personal finances.
Can I use these calculators on mobile devices?
Yes, all calculators are fully responsive and work on smartphones, tablets, and desktop browsers. The interfaces adapt to any screen size for a smooth experience on any device.
What is the most popular calculator on FreeAIBox?
Our BMI Calculator, Age Calculator, Percentage Calculator, Loan Calculator, and GPA Calculator are among the most used tools. The Tip Calculator is also popular for restaurant and service tipping calculations.