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506+ free MyCalcsWorld tools with how-to steps, worked examples, formula notes, and FAQs on every page. Pick a category or search.
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Finance
Mortgage Calculator
Estimate monthly principal & interest for a fixed-rate mortgage or home loan — with full amortization chart and year-by-year table (classic EMI / amortizing loan math).
OpenFinanceLoan / EMI Calculator
Calculate EMI for personal, auto, or home loans worldwide with interest breakdown, chart, and yearly schedule.
OpenFinanceCompound Interest Calculator
Project compound growth with optional regular deposits, effective APY, rate of return, time to double, chart, and yearly schedule.
OpenFinanceROI Calculator
Measure return on investment as gain and percentage.
OpenFinanceCurrency Converter
Convert between USD, EUR, GBP, INR, JPY, AED and more using periodically refreshed FX rates.
OpenFinanceRetirement Nest Egg (Simple)
Project retirement savings with regular monthly contributions.
OpenFinanceCompounding Calculator
Compare continuous vs n-times-per-year compounding, effective annual rate, and a year-by-year growth schedule.
OpenFinanceSIP / Recurring Investment
Project SIP / recurring investment maturity with invested-vs-portfolio chart — useful for mutual funds and global DCA.
OpenFinanceDaily Compound Interest Calculator
Project daily compounding with daily or annual rates, optional reinvest %, deposits, and business-day filtering — plus balance chart and snapshots.
OpenTrending
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Finance
Mortgage Calculator
Estimate monthly principal & interest for a fixed-rate mortgage or home loan — with full amortization chart and year-by-year table (classic EMI / amortizing loan math).
OpenFinanceLoan / EMI Calculator
Calculate EMI for personal, auto, or home loans worldwide with interest breakdown, chart, and yearly schedule.
OpenFinanceCompound Interest Calculator
Project compound growth with optional regular deposits, effective APY, rate of return, time to double, chart, and yearly schedule.
OpenFinancePercentage Calculator
Quick percentage of a number — useful for tips, discounts, and taxes.
OpenFinanceTip Calculator
Calculate tip amount and per-person split for dining out.
OpenFinanceDiscount Calculator
Find the sale price and savings from a percent-off discount.
OpenFinanceCurrency Converter
Convert between USD, EUR, GBP, INR, JPY, AED and more using periodically refreshed FX rates.
OpenFinanceCompounding Calculator
Compare continuous vs n-times-per-year compounding, effective annual rate, and a year-by-year growth schedule.
OpenFinanceSIP / Recurring Investment
Project SIP / recurring investment maturity with invested-vs-portfolio chart — useful for mutual funds and global DCA.
OpenFinanceCAGR Calculator
Compound annual growth rate between a beginning and ending value.
OpenFinanceDaily Compound Interest Calculator
Project daily compounding with daily or annual rates, optional reinvest %, deposits, and business-day filtering — plus balance chart and snapshots.
OpenMathBasic Calculator
Add, subtract, multiply, and divide two numbers.
OpenFinance
109 tools
- 401(k) Contribution Growth
- Add / Remove Sales Tax
- Amortization Chart
- Amortization Schedule
- Annuity Calculator
- APR to APY Converter
- APR vs APY Comparator
- Auto Lease Payment Estimator
- Balance Transfer Calculator
- Balloon Loan Calculator
- Biweekly Mortgage Calculator
- Bond Yield Calculator
- Break-Even Calculator
- Budget Percentage Calculator
- CAGR Calculator
- Capital Gains Tax (Rough)
- Capital Gains Tax Estimator
- Car Loan Calculator
- Cash Back Calculator
- CD / APY Calculator
- Closing Cost Estimate
- Coast FIRE Calculator
- Compound Growth 3D Bars
- Compound Interest Calculator
- Compounding Calculator
- Credit Card Payoff Calculator
- Credit Utilization Calculator
- Crypto Profit Calculator
- Currency Convert (Manual Rate)
- Currency Converter
- Daily Compound Interest Calculator
- Debt Avalanche Calculator
- Debt Consolidation Savings Calculator
- Debt Payoff Calculator
- Debt Snowball Calculator
- Debt-to-Income Ratio
- Discount Calculator
- Dividend Yield Calculator
- Doubling Time Calculator
- Down Payment Calculator
- Effective Interest Rate
- EMI with Extra Payments
- FIRE Number Calculator
- Foreign Transaction Fee Calculator
- Forex Compounding Calculator
- Forex Position Size Calculator
- Freelancer Tax Set-Aside Calculator
- Future Value Calculator
- Future Value of Annuity
- GST / VAT Calculator
- GST Invoice Split Calculator
- HELOC Payment Estimator
- Home Affordability Calculator
- HSA Contribution Room Calculator
- Inflation Adjuster
- Inflation Calculator
- Interest Rate Calculator
- Interest-Only Mortgage Calculator
- Investment Calculator
- Investment Return Calculator
- IRA Contribution Room
- IRR Calculator
- Lease vs Buy Calculator
- Loan / EMI Calculator
- Loan Affordability Calculator
- Loan Payoff Calculator
- Money Market Account Calculator
- Mortgage Calculator
- Mortgage Points Calculator
- Mortgage Recast Calculator
- Net Worth Calculator
- NPV Calculator (Simple)
- Overtime Pay Calculator
- P/E Ratio Calculator
- Pay Raise Calculator
- Paycheck / Tax Rough Estimator
- Payday Loan Cost Calculator
- Percentage Calculator
- Present Value Calculator
- Property Tax Calculator
- Property Tax Estimate
- Refinance Break-Even Calculator
- Refinance Calculator
- Rent Affordability Calculator
- Rent vs Buy Calculator
- Retirement Nest Egg (Simple)
- Reverse Sales Tax Calculator
- Risk / Reward Ratio Calculator
- ROI Calculator
- Roth Conversion Tax Estimator
- Rule of 72
- Salary After Tax (illustrative slabs)
- Salary After Tax (US Rough)
- Salary Hike Calculator
- Sales Tax Calculator
- Savings Goal Calculator
- Savings Rate Calculator
- Simple Interest Calculator
- SIP / Recurring Investment
- SIP Growth Chart
- Stacked Discount Calculator
- Stock Average Cost Calculator
- Stock Return Calculator
- Student Loan Payoff Calculator
- Subscription Cost Audit
- Tip + Tax + Split Mega
- Tip Calculator
- Venmo / PayPal Fee Calculator
- Yield to Maturity (Approx)
Math
70 tools
- 2×2 Matrix Determinant
- 3D Cylinder Geometry
- 3D Distance Calculator
- 3D Function Plotter
- 3D Pythagoras / Space Diagonal
- 3D Sphere Geometry
- 3D Vector Addition
- Age Calculator
- Angle Converter (Deg ↔ Rad)
- Arithmetic Sequence Term
- Aspect Ratio Calculator
- Average / Mean / Median / Mode
- Average Calculator
- Base Converter
- Basic Calculator
- Binary Hex Converter
- Binomial Probability Calculator
- Circle Calculator
- Complex Number Calculator
- Cone / Frustum (3D)
- Cone Volume Calculator
- Cylinder Calculator
- Decimal to Fraction Calculator
- Distance Formula Calculator
- Exponent Calculator
- Factorial Calculator
- Factorial Calculator
- Fibonacci nth Term
- Fraction Calculator
- GCF / LCM Calculator
- Geometric Sequence Term
- Logarithm Calculator
- Matrix Multiply 2×2
- Matrix Multiply 3×3
- Million / Billion Converter
- Multi-Step Percentage Change
- Nth Root Calculator
- Numeric Derivative
- Numeric Integral
- Percentage Calculator (Mega)
- Percentage Change
- Percentage Of
- Permutation & Combination
- Prime Number Checker
- Pyramid Volume (3D)
- Pyramid Volume Calculator
- Pythagoras Theorem Calculator
- Quadratic Equation Solver
- Quadratic Equation Solver
- Radians ↔ Degrees
- Random Number Generator
- Ratio Calculator
- Rectangle Area & Perimeter
- Roman Numeral Converter
- Roman Numerals Converter
- Scientific Calculator
- Scientific Notation Converter
- Scientific Notation Converter (bidirectional)
- Series Sum Calculator
- Significant Figures Rounder
- Simple Graphing Calculator
- Slope Calculator
- Sphere Volume & Surface
- Torus Volume (3D)
- Trapezoid Area Calculator
- Triangle Area (Heron's Formula)
- Triangle Sides & Angles Solver
- Unit Circle Calculator
- Vector Magnitude Calculator
- Weighted Average Calculator
Health & Fitness
50 tools
- BAC Rough Estimate (Widmark)
- Blood Pressure Category
- BMI Calculator
- BMR Calculator
- Body Fat (U.S. Navy)
- Body Recomp Calories
- Body Surface Area (Mosteller)
- Caffeine Half-Life Estimator
- Caffeine Sleep Cutoff Calculator
- Calorie / TDEE Calculator
- Calorie Deficit Calculator
- Calories Burned (MET)
- Cat Age Calculator
- Child BMI Calculator
- Cigarette Cost Calculator
- Dog Age Calculator
- Heart Rate Zones Calculator
- Ideal Body Weight (Multiple Formulas)
- Ideal Weight Calculator
- Intermittent Fasting Window
- Jet Lag Planner
- kJ ↔ Calories Converter
- Lean Body Mass Calculator
- Macro Calculator
- Macro Calculator
- Macros by Goal
- One-Rep Max Calculator
- Ovulation Calculator
- Pace ↔ Speed Converter
- Pregnancy Conception Window
- Pregnancy Due Date
- Pregnancy Week Tracker
- Pregnancy Weight by Week
- Pregnancy Weight Gain Estimate
- Protein Need Calculator
- Protein per Dollar Calculator
- Running Cadence Estimator
- Running Pace & Finish Time
- Running Pace Calculator
- Sleep Cycle Calculator
- Sleep Debt Calculator
- Sobriety Calculator
- Standard Drink Calculator
- Steps to Miles & Calories
- Target Heart Rate Calculator
- VO₂ Max Estimate
- Waist–Hip Ratio
- Walk a Mile Time
- Walking Pace Calculator
- Water Intake Calculator
Conversion
24 tools
- Area Converter
- Clothing Size (Rough Tables)
- Cubic Feet Calculator
- Cubic Meters (CBM) Calculator
- Cubic Yards Calculator
- Data Storage Converter
- DPI / PPI Calculator
- Energy Converter
- Fuel Economy Converter
- Fuel Economy Converter
- Length Converter
- Lumens to Watts Converter
- Miles per kWh Calculator
- MPGe Calculator
- Power Converter
- Pressure Converter
- RGB ↔ Hex Color Converter
- Shoe Size Converter
- Shoe Size Converter
- Speed Converter
- Temperature Converter
- Time Unit Converter
- Volume Converter
- Weight Converter
Date & Time
19 tools
- Add / Subtract Days
- Add Hours & Minutes
- Age Difference Calculator
- Age from Date of Birth
- Birthday Calculator
- Business Days Between Dates
- Business Days Calculator
- Date Difference
- Datetime to Unix Timestamp
- Days From Today
- Days Until Date
- Generation Calculator
- Hours Between Date-Times
- ISO Week Number
- Payday Calendar
- Timezone Meeting Planner
- Unix Timestamp Converter
- Workdays Calculator
- Zodiac Sign Calculator
Everyday Life
106 tools
- AC BTU Calculator
- Air Fryer Converter
- Airbnb vs Hotel Calculator
- Aquarium Volume Calculator
- Asphalt Calculator
- Awning / Canopy (3D)
- Baby Cost First-Year Calculator
- Board Feet Calculator
- Bookshelf Planner (3D)
- BTU Cooling / Heating Estimator
- Commute Cost Calculator
- Concrete Bags Calculator
- Concrete Calculator
- Concrete Slab (3D)
- Concrete Volume Calculator
- Cooking Unit Converter
- Deck Boards & Joists (3D)
- Decking Boards Calculator
- Dog Food Portion Calculator
- Driveway Asphalt (3D)
- Drywall Sheets Calculator
- Dumpster Fill (3D)
- Electricity Cost Calculator
- EV Charging Cost Calculator
- Everyday Tip Helper
- Fence Calculator
- Fence Panels & Posts (3D)
- Fence Posts Calculator
- Fireplace Hearth Pad (3D)
- Flooring Cost Calculator
- Flooring How Much Calculator
- Fuel Cost Calculator
- Fuel vs EV Cost
- Generator Wattage Calculator
- GPA Calculator
- Grade Percentage Calculator
- Grams ↔ Cups (by ingredient)
- Gravel / Aggregate Tonnage
- Gravel / Mulch Calculator
- Gravel Calculator
- Gravel Fill (3D)
- Greenhouse Size (3D)
- Grocery Budget per Person
- Gutter & Downspout (3D)
- Heat Index Calculator
- Hot Tub / Spa Volume (3D)
- Hotel Resort Fee Total Calculator
- HVAC Tonnage (Rough Rule)
- Hybrid vs Gas Cost Calculator
- Insulation R-Value Layers
- Insulation Savings (Rough)
- Ladder Lean & Reach (3D)
- LED Savings Calculator
- Lumber Board Feet Calculator
- Lumber Board-Feet / Beam (3D)
- Lumber Linear Feet
- Meal Prep Cost Calculator
- Money Counter
- Moving Boxes Estimator
- Oven Temperature Converter
- Pace (min/km) Helper
- Paint Calculator
- Paint Coverage Calculator
- Parking Bay Fit (3D)
- Parking Fee Calculator
- Password Entropy Estimator
- Password Strength Checker
- Pool Volume (3D)
- Pool Volume Calculator
- Price per Square Foot
- Rain Barrel Catchment (3D)
- Raised Bed Soil Calculator
- Ramp Incline (3D)
- Random Number Generator
- Recipe Scaler
- Remote Work Savings Calculator
- Retaining Wall (3D)
- Roof Pitch & Area (3D)
- Roof Pitch Calculator
- Roofing Calculator
- Room Volume & Ventilation (3D)
- Septic Tank Capacity (3D)
- Shipping Box Fit (3D)
- Simple Carbon Footprint
- Sod Calculator
- Soil Excavation (3D)
- Solar Panel Savings Estimator
- Spiral Staircase (3D)
- Split Bill Calculator
- Square Footage Calculator
- Stair Stringer (Rough)
- Stairs Layout (3D)
- Streaming Data Usage Calculator
- Subscription Cost Rollup
- Tile Calculator
- Time to Decimal Hours
- Time Zone Difference
- Tip + Tax + Split
- Tip + Tax Combo
- Tip by Country
- Trailer Cargo Fit (3D)
- Uneven Bill Split
- Unit Price Calculator
- Wallpaper Rolls Calculator
- Wedding Budget Calculator
- Wind Chill Calculator
Science & Engineering
50 tools
- Acceleration Calculator
- Battery Run-Time Calculator
- Boat Hull Volume Approx (3D)
- Camera FOV & Framing (3D)
- Capacitor Energy Calculator
- Capacitor Series / Parallel
- Conveyor Incline (3D)
- Density Calculator
- Density Calculator
- Density from Mass & Volume
- Doppler Shift Calculator
- Electrical Power (P = VI)
- Electrical Power Calculator
- Flight Carbon Footprint Calculator
- Force (F = ma)
- Free Fall Distance Calculator
- Freefall Calculator
- Frequency ↔ Wavelength Converter
- Guy Wire Length (3D)
- Half-Life Calculator
- Half-Life Decay Calculator
- Ideal Gas Law (PV=nRT)
- Ideal Gas Law Solver
- Kinetic Energy Calculator
- LED Resistor Calculator
- Molarity Calculator
- Momentum Calculator
- Ohm's Law Calculator
- Ohm's Law Solver
- Ohm's Law Triangle
- pH Calculator
- Pipe Volume (3D)
- Pressure Calculator
- Projectile Motion Calculator
- Resistor Color Code Calculator
- Resistor Series / Parallel
- Silo + Hopper Capacity (3D)
- Snell's Law Calculator
- Solar Panel Tilt (3D)
- Speed / Distance / Time
- Subnet Calculator
- Tank Fill Level (3D)
- Thin Lens Equation
- Tree Offset Estimate Calculator
- Velocity Calculator
- Video Bitrate File Size Calculator
- Wavelength ↔ Frequency
- Wavelength Calculator
- Wire Gauge (Rough)
- Work & Kinetic Energy
Business
20 tools
- AdSense Revenue Estimate
- Break-Even Price Calculator
- Burn Rate Runway Calculator
- Business ROI
- Container Load Planner (3D)
- Freelance Rate Calculator
- Hourly to Salary Converter
- Margin & Markup Calculator
- Markup from Margin Calculator
- Meeting Cost Calculator
- MRR to ARR Calculator
- NPS Score Calculator
- Overtime Pay Calculator
- Profit Margin Calculator
- Salary to Hourly Converter
- Sales Commission Calculator
- Side Hustle Break-Even Calculator
- SLA Uptime Nines Calculator
- Stacked Discount Calculator
- YouTube CPM Estimate
Education
41 tools
- Absences Impact Calculator
- ACT to SAT Converter
- AP Score Predictor
- Attendance Percentage Calculator
- Class Rank Percentile
- College GPA Planner
- Credit Hour Study Load
- Cumulative GPA Calculator
- ECTS to US Credit Converter
- Exam Curve Calculator
- Final Grade Needed
- Flashcard Study Load Calculator
- GPA to Percentage (Rough)
- Grade Needed on Final
- Grade Points (4.0 Scale)
- Grade Replacement GPA Calculator
- GRE Quant/Verbal Percentile Calculator
- Homework Time Estimator
- IB Grade Converter
- IQ Percentile Calculator
- Late Work Penalty Calculator
- Pass/Fail Threshold Calculator
- Percentage to GPA (Approx)
- Pomodoro Study Planner
- Quiz Average Calculator
- Reading Speed (Pages) Calculator
- Reading Time Estimator
- Rubric Score Calculator
- SAT to ACT Converter
- Scholarship GPA Check
- Semester GPA Calculator
- Student Loan Repayment (Simple)
- Study Streak Planner
- Study Time Planner
- Test Grade Percentage Calculator
- Tuition Cost per Credit
- Typing Speed WPM Calculator
- Weighted Assignment Planner
- Weighted Grade Calculator
- Word Count to Pages Calculator
- Z-Score Grade Calculator
Statistics
13 tools
- A/B Test Sample Size Calculator
- Combination & Permutation
- Margin of Error (Proportion)
- Margin of Error (Rough)
- Mean Absolute Deviation
- Mean Confidence Interval (Approx)
- Pearson Correlation Calculator
- Percentile Rank (Simple)
- Sample Size Calculator
- Simple Linear Regression
- Standard Deviation Calculator
- Z-Score Calculator
- Z-Score from Raw Score