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All 40 Free Online Calculators

Every calculator tool available on SmartCalc — organised by category. All free, instant, no signup, no data stored.

⚡ Use Any Tool Now 📖 Read Guides

🔢 Math Calculators ➔

🔢Standard CalculatorMath 🔬Scientific CalculatorMath · 30+ functions 📊Percentage CalculatorMath · 3 modes 📐Ratio CalculatorMath ½Fraction CalculatorMath 🧮Quadratic SolverMath · ax²+bx+c=0 📉Statistics CalculatorMath · Mean, SD, more 🔲Matrix CalculatorMath · 2×2 operations 𝕀Roman NumeralsMath · 1–3999 💻Number Base ConverterMath · BIN OCT HEX

⚖️ Conversion Tools ➔

⚖️Unit ConverterConversion · 200+ units 💱Currency ConverterConversion · Live ECB rates ₿Crypto ConverterConversion · Live CoinGecko 🎨Color ConverterConversion · HEX RGB HSL 🌍Time Zone ConverterConversion · 20 zones 🔌Binary ArithmeticConversion · AND OR XOR

💰 Finance Calculators ➔

🏦Loan / EMI CalculatorFinance 📈Investment / CAGRFinance · SIP & lump sum 🏠Mortgage CalculatorFinance · Home loan 🏷️Discount CalculatorFinance 🧾Tax / GST / VATFinance · Add or extract 🍽️Tip & Bill SplitFinance 💼Salary / CTCFinance · India take-home 🌴Retirement PlannerFinance · Corpus

💪 Health Calculators ➔

💪BMI CalculatorHealth · WHO ranges 🥗Calorie / TDEEHealth · Mifflin–St Jeor 💧Water IntakeHealth · Daily hydration 🤰Pregnancy Due DateHealth · EDD from LMP

📅 Date & Time ➔

🎂Age CalculatorDate & Time · Exact age 📅Date DifferenceDate & Time ⚡Speed / Dist / TimeDate & Time ⛽Fuel Cost CalculatorDate & Time

🎓 Academic Tools ➔

🎓GPA CalculatorAcademic · 4.0 scale 📝Grade CalculatorAcademic · Weighted

🔧 Engineering Tools ➔

⚡Ohm's LawEngineering · V I R P 📏Area & VolumeEngineering · 8 shapes 📐Triangle CalculatorEngineering · All angles

🛠️ Utility Tools ➔

🎲Random Number GenUtility · Dice, UUID 🔐Password GeneratorUtility · Crypto secure #️⃣Text ToolsUtility · Word count
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