Math & Number Tools

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Percentage Calculator & Formula Solver

Calculate percentages, percentage increases, discounts, and differences with instant step-by-step mathematical formulas.

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Image & Video Aspect Ratio Resizer Calculator

Calculate locked width and height scaling dimensions for standard aspect ratios (16:9, 4:3, 1:1, 9:16).

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Trip Fuel Cost & Mileage Calculator

Estimate road trip fuel costs, fuel volume needed, and cost per mile/kilometer.

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Cryptographic Random Number Range Generator

Generate cryptographically secure random numbers with min/max ranges and unique options.

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Fraction to Decimal & Percentage Converter

Reduce fractions to lowest terms and convert to decimal and percentage.

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Discount & Double Sale Price Calculator

Calculate clearance discounts, additional stacked coupons, and total dollar savings.

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Sales Tax & Reverse VAT Calculator

Calculate forward and reverse Sales Tax, VAT, and GST with gross and net price breakdowns.

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Simple vs Compound Interest Comparator

Side-by-side comparison of simple vs compound interest growth over time.

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Tip & Multi-Person Bill Splitter

Calculate tip percentages and split restaurant bills evenly or with round-up options.

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Universal Unit Converter

Instant unit converter across 8 categories: Length, Weight, Temperature, Volume, Speed, Area, Digital Storage, and Time.

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Compound Interest Calculator

Calculate how your money grows over time with compound interest, regular monthly deposits, and flexible compounding frequencies.

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Loan & Mortgage Calculator

Calculate monthly loan and mortgage payments, total interest costs, and full amortization schedule with CSV export.

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Fraction Calculator with Steps

Add, subtract, multiply, and divide fractions and mixed numbers with step-by-step explanations.

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Aspect Ratio Calculator & Dimensions Tool

Calculate missing image or video dimensions, find simplified aspect ratios (16:9, 4:3, 1:1), and generate CSS aspect-ratio code.

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Tip Calculator & Bill Splitter

Calculate restaurant tips, split bills among multiple people, and round up totals with custom tip percentages and currency support.

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Roman Numeral Converter & Translator

Convert Roman numerals to numbers and Arabic integers to Roman numerals with instant step-by-step subtractive explanation.

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Compass Bearing & Heading Azimuth Calculator

Calculate initial and final compass bearing (0°–360°) and 16-point cardinal direction between two GPS coordinates.

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Sales Tax & VAT Calculator

Calculate sales tax, VAT, and reverse pre-tax amounts with US and international tax rate presets.

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Centripetal Force & Acceleration Calculator

Calculate circular motion Centripetal Force ($F_c = mv²/r$), acceleration, and angular velocity in Newtons.

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Compound Annual Growth Rate (CAGR) Calculator

Calculate investment Compound Annual Growth Rate (CAGR), absolute total returns, and growth multiple.

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Density, Mass & Volume Physics Calculator

Calculate material Density, Mass, or Volume (ρ = m/V) with substance presets (Gold, Water, Steel).

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Retail Discount & Final Price Savings Calculator

Calculate final checkout price, dollar savings, and sales tax from original retail price and discount percentage.

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Elevation Grade, Slope & Incline Calculator

Calculate road slope incline percentage (%), rise/run ratio, and angle of elevation in degrees.

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Haversine GPS Great-Circle Distance Calculator

Calculate spherical great-circle distance between two latitude and longitude coordinates in kilometers, miles, and nautical miles.

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Kinetic & Potential Energy Physics Calculator

Calculate mechanical Kinetic ($E_k = ½mv²$) and Gravitational Potential Energy ($E_p = mgh$) in Joules.

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Light Wavelength, Frequency & Photon Energy Calculator

Calculate electromagnetic photon energy (eV & Joules), frequency (THz), and visible light color from wavelength.

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Ohm's Law & Electrical Power Calculator

Calculate Voltage (V), Current (I), Resistance (R), and Power (P) in electrical circuits.

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Radioactive Decay & Half-Life Calculator

Calculate isotope remaining quantity, decay constant, and elapsed half-lives over time.

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Resistor Color Code 4-Band & 5-Band Decoder

Decode 4-band and 5-band electronic resistor color codes to Ohms, tolerance, and multiplier values.

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Physics Projectile Motion Kinematics Calculator

Calculate projectile flight time, maximum peak height, and trajectory range with visual parabolic canvas.

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GPS Coordinate Format Converter (DD, DMS, DDM)

Convert between Decimal Degrees (DD), Degrees Minutes Seconds (DMS), and Degrees Decimal Minutes (DDM).

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IEEE-754 Floating Point Binary & Hex Converter

Convert decimal floating-point numbers to 32-bit single and 64-bit double IEEE-754 binary representations.

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Maidenhead Grid Locator QTH Converter

Convert Ham radio QTH Maidenhead grid squares (e.g. FN31pr) to and from GPS latitude/longitude.

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BMI Calculator & Healthy Weight Range Solver

Calculate Body Mass Index (BMI), healthy weight range, and WHO classification with metric and imperial units.

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Roman Numeral Converter & Arithmetic Calculator

Convert bidirectional integers (1 to 3,999,999) to Roman numerals with arithmetic operations.

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Circle & Sphere Calculator with Formulas

Calculate radius, diameter, circumference, circle area, sphere surface area, and volume from any single known property.

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Random Number Generator, Dice Roller & Raffle Picker

Generate cryptographically fair random numbers, roll tabletop dice (D6, D20, D100), and pick unique raffle winners.

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Scientific & Engineering Notation Converter

Convert decimal numbers into standard Scientific Notation, Engineering Notation, and E-notation with power of 10 steps.

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Discount, Sale Price & Stacked Coupon Calculator

Calculate final sale prices, dollar savings, double stacked coupon discounts, and sales tax addition.

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Angle Converter (Degrees, Radians, Gradians)

Convert angles between Degrees, Radians, Gradians, Arcminutes, Arcseconds, and Full Revolutions.

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Area Converter (Square Meters, Acres, Hectares)

Convert land and spatial area measurements between Square Meters, Square Feet, Acres, Hectares, and Square Miles.

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Cooking Recipe Volume & Weight Converter

Convert recipe measurements between Cups, Tablespoons, Teaspoons, Fluid Ounces, Grams, and Milliliters.

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Data Rate & Download Time Calculator

Calculate bandwidth transfer speeds and exact download times for any file size over 4G, 5G, and Gigabit connections.

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Force Converter (Newtons, Dynes, lbf, kgf)

Convert physical force between Newtons (N), Kilonewtons (kN), Dynes, Pound-force (lbf), and Kilogram-force (kgf).

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Power Converter (Watts, Kilowatts, Horsepower, BTU/h)

Convert power ratings between Watts, Kilowatts, Megawatts, Metric and Mechanical Horsepower, and BTU per hour.

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Typography Units Converter (PX, REM, EM, PT)

Convert font and layout sizes between Pixels (px), Root-EM (rem), EM, Points (pt), and Inches.

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Auto Loan Financing & Monthly Payment Calculator

Calculate monthly car loan payments, total interest, and total purchase cost with sales tax, down payments, and trade-in allowances.

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Cost of Goods Sold (COGS) & Gross Margin Calculator

Calculate Cost of Goods Sold (COGS), Gross Profit, and Gross Profit Margin % for retail and e-commerce.

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Debt Snowball & Avalanche Payoff Planner

Calculate your debt-free date and total interest saved using the Debt Snowball or Debt Avalanche payoff strategies.

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Emergency Fund Savings Buffer Calculator

Calculate your recommended 3, 6, and 12-month emergency cash buffer based on essential living expenses.

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Freelance & Consultant Hourly Rate Calculator

Calculate your optimal freelance hourly billable rate based on target salary, taxes, overhead, and non-billable hours.

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Net Worth Asset & Liability Calculator

Calculate your personal net worth and liquidity ratio by tallying assets against outstanding liabilities.

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Personal Runway & Burn Rate Calculator

Calculate startup or personal financial runway in months and forecast your zero-cash depletion date.

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Present Value & Discounted Cash Flow (DCF) Calculator

Calculate the present discounted value (PV) of future cash flows and capital investments.

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Stock Dividend Yield & Growth Calculator

Project dividend income, dividend yield on cost, and compound growth with automatic DRIP reinvestment.

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Subscription Cost Annualizer & Expense Auditor

Calculate total annual and 5-year compound costs of recurring software, streaming, and membership subscriptions.

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Binary Bitwise & Logic Gate Calculator

Perform bitwise operations (AND, OR, XOR, NOT, NAND, NOR, Shift Left <<, Shift Right >>) on binary, decimal, and hexadecimal numbers.

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GCD & LCM Calculator

Calculate Greatest Common Divisor (GCD) and Least Common Multiple (LCM) for two or more integers with step-by-step factorization.

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Mean, Median, Mode & Standard Deviation Calculator

Calculate mean, median, mode, sample and population standard deviation, variance, and IQR from any dataset.

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Percentage Change & Increase/Decrease Calculator

Calculate percentage increase or decrease between initial and final values with difference breakdown.

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Permutations & Combinations (nPr & nCr) Calculator

Calculate permutations nPr and combinations nCr with factorials and order importance explanations.

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Quadratic Equation Solver with Steps

Solve quadratic equations ax² + bx + c = 0 with real and complex roots, discriminant, and parabola vertex.

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Significant Figures (Sig Figs) Calculator

Count significant digits in any number, round to target sig figs, and format in scientific notation.

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Z-Score & Normal Distribution Probability Calculator

Calculate standard score (Z-score), percentile rank, and left/right tail p-value probabilities.

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Data Storage & Bandwidth Converter

Convert bits, bytes, KB, MB, GB, TB, and network bandwidth transfer rates (Mbps, Gbps).

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Length & Distance Converter

Convert length and distance between meters, kilometers, feet, inches, yards, miles, and nautical miles.

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Mass & Weight Converter

Convert weights between grams, kilograms, metric tonnes, pounds, ounces, and stones.

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Pressure Unit Converter

Convert pressure across Pascals (Pa), Bar, PSI, Standard Atmosphere (atm), and mmHg.

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Speed & Velocity Converter

Convert speed between kilometers per hour (km/h), miles per hour (mph), meters per second (m/s), knots, and Mach.

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Temperature Scale Converter

Convert temperatures across Celsius, Fahrenheit, Kelvin, and Rankine scales with benchmark markers.

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Volume & Liquid Capacity Converter

Convert volume across liters, milliliters, cubic meters, gallons, quarts, pints, cups, and fluid ounces.

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Break-Even Analysis & Volume Calculator

Calculate the break-even point in unit volume and dollar revenue based on fixed costs, variable costs, and sales price.

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Currency & Number to Words Converter

Convert numerical monetary amounts and numbers into English words for cheques, legal contracts, and invoices.

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Inflation Impact & Purchasing Power Calculator

Calculate how inflation erodes purchasing power over time and determine equivalent future money value.

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Gross Margin & Markup Calculator

Calculate gross profit margin percentage and markup percentage bi-directionally from cost and revenue.

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Mortgage Amortization Schedule Calculator

Calculate monthly mortgage payments, total interest paid, and inspect interactive yearly amortization schedules.

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ROI (Return on Investment) Calculator

Calculate total Return on Investment (ROI), annualized ROI rate, and net capital gains percentage.

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Salary to Hourly Pay Converter

Convert annual salary to hourly wage, weekly, bi-weekly, monthly pay, and overtime rates.