Math

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal bases instantly.

Date & Time

Time Zone Converter

Convert time between major world time zones instantly. Plan international meetings and cal

Everyday

Speed Distance Time Calculator

Calculate speed, distance, or time from any two known values. Supports km/h, mph, and m/s.

Everyday

Roman Numeral Converter

Convert between Roman numerals and Arabic numbers instantly. Supports values from 1 to 399

Business

Expense to Income Ratio Calculator

Calculate your expense to income ratio to understand your financial health and spending ef

Chemistry

Boyle's Law Calculator

Calculate pressure or volume of a gas using Boyle's Law (P₁V₁ = P₂V₂) at constant temperat

Math

Quadratic Equation Solver

Enter coefficients a, b, and c to solve a quadratic equation and calculate its real roots.

Physics

Kinetic Energy Calculator

Calculate the kinetic energy of a moving object using its mass and velocity. Instant physi

Unit Converter

Length Converter

Convert between all length and distance units — meters, feet, inches, miles, kilometers an

Chemistry

Stoichiometry Calculator

Calculate moles, mass, or molecules of reactants and products using stoichiometric ratios.

Everyday

Pace Calculator

Calculate running pace, finish time, or distance for any race from 5K to marathon.

Everyday

Fuel Efficiency Converter

Convert fuel efficiency between MPG, L/100km, km/L and other units instantly.

Physics

Velocity Calculator

Enter the distance traveled and time taken to calculate the velocity of an object. Instant

Everyday

Fuel Cost Calculator

Calculate your fuel cost for a trip based on distance, fuel efficiency, and fuel price.

Physics

Torque Calculator

Calculate torque from force and lever arm length, or find force or distance given any two

Chemistry

Molar Mass Calculator

Calculate the molar mass of common chemical elements and look up atomic weights instantly.

Unit Converter

Weight Converter

Convert between kilograms, pounds, ounces, grams, stones and more weight units instantly.

Statistics

Standard Deviation Calculator

Calculate population and sample standard deviation, variance, and more for a dataset.

Unit Converter

Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin and Rankine temperature scales instantly.

Construction

Volume Calculator

Calculate the volume of common 3D shapes: cube, sphere, cylinder, cone and rectangular pri

Everyday

Pressure Converter

Convert pressure between Pa, kPa, bar, psi, atm, mmHg and more instantly.

Physics

Ohm's Law Calculator

Calculate voltage, current, resistance or power using Ohm's Law. Solve for any electrical

Statistics

Mean Median Mode Calculator

Calculate mean, median, mode, range and standard deviation for a set of numbers.

Construction

Area Calculator

Calculate the area of common shapes: rectangle, circle, triangle, trapezoid and more.

Chemistry

Half Life Calculator

Calculate the remaining quantity of a radioactive substance after a given time using half-

Everyday

Binary to Decimal Converter

Convert between binary, decimal, hexadecimal, and octal number systems instantly.

Date & Time

Add Days to Date Calculator

Add or subtract any number of days from a date to find a future or past date instantly.

Physics

Ohm Law Resistor Color Code Calculator

Decode 4-band and 5-band resistor color codes to find resistance value and tolerance.

Math

Prime Number Checker

Check if a number is prime and find all prime factors of any number instantly.

Chemistry

pH Calculator

Calculate the pH of a solution using the H⁺ ion concentration. Enter the concentration in

Physics

Ohm Law Power Triangle Calculator

Calculate voltage, current, resistance, and power using any two known electrical values.

Everyday

Angle Converter

Convert angles between degrees, radians, gradians, and turns instantly.

Statistics

Z-Score Calculator

Calculate the Z-score of a data point and find the corresponding percentile rank.

Physics

Ohm Law Capacitor Charge Calculator

Calculate the charge, energy stored, and voltage across a capacitor given capacitance and

Everyday

Trigonometry Calculator

Calculate sin, cos, tan, asin, acos, atan and all trig values for any angle in degrees or

Everyday

Matrix Calculator

Add, subtract, multiply 2×2 and 3×3 matrices and calculate the determinant instantly.

Everyday

Perimeter Calculator

Calculate the perimeter of common shapes: square, rectangle, triangle, circle, and more.

Math

Customer Lifetime Value Calculator

Calculate the Customer Lifetime Value (CLV) to understand the long-term revenue potential

Date & Time

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates instantly. Supports current time