All Online Calculators & Converters
Browse our complete directory of 65 free, instant calculation tools covering finance, mathematics, health, conversions, and everyday life.
Percentage Calculator
Calculate percentages, percentage change, and proportions instantly with our free online percentage calculator.
Percentage Increase Calculator
Calculate the percentage increase from an initial starting value to a final value easily.
Percentage Decrease Calculator
Calculate the percentage reduction or decline from an original value to a lower value.
Percentage Difference Calculator
Calculate the percentage difference between two non-zero positive numbers where neither is the initial reference.
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step reduction to simplest terms.
Decimal to Fraction Calculator
Convert any decimal number into its exact simplified fraction and mixed number equivalent.
Fraction to Decimal Calculator
Convert any proper, improper, or mixed fraction into an exact decimal value.
Ratio Calculator
Solve, simplify, scale, and compare ratios A:B = C:D with instant missing value solutions.
Average Calculator
Calculate the arithmetic average (mean), sum, and count for any list of numbers.
Mean, Median, Mode Calculator
Calculate mean, median, mode, range, and statistical summary for any dataset.
Standard Deviation Calculator
Calculate sample and population standard deviation, variance, and mean with step-by-step variance breakdown.
Square Root Calculator
Calculate the principal square root of any positive number with decimal precision.
Cube Root Calculator
Calculate the cube root (³√x) of any positive or negative real number.
Exponent Calculator
Calculate base numbers raised to powers and exponents (x^y) with large number support.
Logarithm Calculator
Calculate natural logarithm (ln), common logarithm (log10), and arbitrary base logarithms log_b(x).
GCF & LCM Calculator
Find Greatest Common Factor (GCF/HCF) and Least Common Multiple (LCM) of two or more numbers.
Prime Number & Factorization Calculator
Check if a number is prime and find its complete prime factorization decomposition.
Scientific Calculator
Solve scientific expressions including trigonometric functions (sin, cos, tan), roots, logarithms, and constants.
Modulo Calculator
Calculate the modulo (remainder) of integer division a mod b, with quotient breakdown.
Loan Calculator
Estimate your monthly loan payments, total interest, and total repayment cost for personal loans, auto loans, or general debt.
Mortgage Calculator
Calculate monthly mortgage payments including principal, interest, property taxes, and home insurance.
Compound Interest Calculator
Calculate future wealth accumulation through compound interest and recurring monthly contributions.
Simple Interest Calculator
Calculate simple interest earnings or loan interest based on the standard I = P × r × t formula.
ROI Calculator (Return on Investment)
Calculate Return on Investment (ROI) and annualized ROI percentage for any financial venture or investment.
Profit Margin Calculator
Calculate gross profit margin, markup percentage, and net profit from cost and revenue values.
Discount & Sale Price Calculator
Calculate discounted sale prices, savings amount, and final total including optional sales tax.
VAT Calculator (Value Added Tax)
Add or remove Value Added Tax (VAT) from any gross or net price with standard European and African tax rates.
Tip & Split Bill Calculator
Calculate gratuity tips and split the total restaurant or service bill evenly among friends.
Break-Even Analysis Calculator
Calculate the break-even sales volume in units and dollar revenue needed to cover total business fixed and variable costs.
Currency Converter
Convert between world currencies including USD, EUR, GBP, RWF (Rwandan Franc), KES, UGX, and more with configurable baseline exchange rates.
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes based on your date of birth.
Date Difference & Days Between Dates
Calculate the total number of days, weeks, months, and years between any two calendar dates.
Business Days Calculator
Calculate working business days (excluding Saturdays and Sundays) between two dates.
Time Duration & Difference Calculator
Calculate time elapsed between two clock times (hours and minutes), or add and subtract time durations.
Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable date and time, and convert any date to Unix seconds or milliseconds.
BMI Calculator (Body Mass Index)
Calculate your Body Mass Index (BMI) and discover whether you fall within underweight, normal, overweight, or obese ranges according to WHO standards.
BMR Calculator (Basal Metabolic Rate)
Calculate your Basal Metabolic Rate (BMR) – the number of calories your body burns at complete rest using the Mifflin-St Jeor equation.
Calorie & TDEE Calculator
Calculate daily calorie needs to maintain, lose weight, or gain muscle based on activity levels.
Ideal Body Weight Calculator
Calculate your healthy ideal body weight range using Devine, Robinson, Miller, and Hamwi formulas.
Water Intake Calculator
Calculate daily hydration and water drinking requirements based on body weight, climate, and exercise level.
Universal Unit Converter
Convert between any metric and imperial units across length, mass, temperature, area, volume, speed, and digital data.
Length & Distance Converter
Convert length measurements between meters, kilometers, centimeters, millimeters, feet, inches, yards, and miles.
Weight & Mass Converter
Convert mass and weight between kilograms, grams, milligrams, pounds (lbs), ounces (oz), and metric tons.
Temperature Converter
Convert temperatures between Celsius (°C), Fahrenheit (°F), and Kelvin (K) with instant formula steps.
Area Calculator
Calculate the surface area of rectangles, squares, circles, triangles, trapezoids, and ellipses.
Circle Calculator
Calculate area, circumference, diameter, and radius of any circle with step-by-step mathematical breakdown.
Pythagorean Theorem Calculator
Find the hypotenuse or missing side of a right triangle using the Pythagorean equation a² + b² = c².
Volume Calculator
Calculate 3D volume and total surface area for cubes, rectangular prisms, cylinders, spheres, and cones.
Business Profit & Margin Calculator
Calculate gross profit, operating profit, and net net profit margin after deducting cost of goods and operating expenses.
Salary to Hourly Wage Calculator
Convert annual salary into hourly rate, weekly paycheck, bi-weekly pay, and monthly income.
Sales Commission Calculator
Calculate sales commissions, base salary plus commission total compensation, and tiered payouts.
GPA & CGPA Calculator
Calculate semester Grade Point Average (GPA) and cumulative CGPA on standard 4.0 scale with credit weighting.
Final Grade Calculator
Calculate the minimum score required on your final exam to achieve your desired target course grade.
Weighted Grade Calculator
Calculate your overall course grade by weighting assignments, quizzes, midterms, and homework.
Fuel Cost & Gas Mileage Calculator
Calculate fuel expenditure, gallons/liters needed, and travel cost per passenger for any road trip.
Paint Quantity Calculator
Calculate how many gallons or liters of paint you need to cover walls, factoring in doors, windows, and coats.
Sleep Cycle Calculator
Calculate ideal bedtimes and wake-up times aligned with human 90-minute REM sleep cycles to wake up feeling refreshed.
Binary Calculator & Base Converter
Convert numbers seamlessly between Binary (Base-2), Decimal (Base-10), Hexadecimal (Base-16), and Octal (Base-8).
Download Time & Bandwidth Calculator
Calculate how long it takes to download or upload files based on file size and internet connection speed.
IP Subnet & CIDR Calculator
Calculate IPv4 network address, broadcast address, subnet mask, usable host range, and total usable hosts from CIDR prefix.
Land Area & Hectare / Acre Converter
Convert agricultural land measurements between Hectares, Acres, Square Meters, and Square Feet.
Fertilizer Application Calculator
Calculate pounds or kilograms of commercial fertilizer (NPK) needed per acre or hectare based on soil nutrient recommendations.
Rwandan Franc (RWF) Currency Converter
Convert Rwandan Francs (RWF) to and from USD, EUR, GBP, Kenyan Shilling (KES), Ugandan Shilling (UGX), Tanzanian Shilling (TZS), and Nigerian Naira (NGN).
Rwanda VAT Calculator (18%)
Calculate Rwanda standard 18% Value Added Tax (TVA) for goods and services in Rwandan Francs (RWF).
Rwanda PAYE Salary Tax Calculator
Calculate employee Pay-As-You-Earn (PAYE) income tax in Rwanda based on the latest Rwanda Revenue Authority (RRA) progressive tax brackets.