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.

Statistics

Confidence Interval Calculator

Calculate the confidence interval for a sample mean using sample size, standard deviation

Math

Slope Calculator

Calculate the slope, y-intercept, distance and equation of a line between two points (x1,

Marine

Rhumb Line Distance Calculator

Calculate rhumb line (loxodrome) distance and true course between two latitude/longitude p

Physics

Free Fall Calculator

Calculate the velocity, distance fallen and time for an object in free fall under gravity,

Marine

Compass Deviation Calculator

Convert between compass course and true course by applying magnetic variation and compass

Marine

Sailing Distance Calculator

Calculate the total nautical distance and estimated sailing time of your yacht voyage acro

Math

Customer Lifetime Value Calculator

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

Everyday

Perimeter Calculator

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

Math

GPA Calculator

Calculate your semester GPA and cumulative GPA based on course grades and credit hours.

Date & Time

Unix Timestamp Converter

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

Everyday

Trigonometry Calculator

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

Physics

Ohm Law Capacitor Charge Calculator

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

Everyday

Matrix Calculator

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

Engineering

Tank Volume Calculator

Calculate the volume and capacity of cylindrical, rectangular and horizontal tanks in gall

Everyday

Coordinate Distance Calculator

Calculate the distance between two points on a 2D or 3D coordinate plane using the distanc

Math

Map Scale Calculator

Convert between map distances and real-world distances using any map scale ratio.

Marine

Distance Converter

Convert between nautical miles, kilometers, statute miles, fathoms, cables, meters, and fe

Marine

Plane Sailing Calculator

Calculate the course and distance between two points by modeling the Earth as a flat plane

Marine

Distance, Speed & Time Calculator

Calculate distance, speed, or time for any voyage leg, with an ETA mode, multi-leg passage

Marine

Marine Bunker Fuel Consumption Calculator

Calculate marine bunker fuel consumption accurately for a single voyage or across a whole

Marine

Time to Arc Converter

Convert time values in hours, minutes, and seconds into arc degrees, minutes, and seconds

Marine

Anchor Swinging Radius Calculator

Determine the safe anchoring swing radius using vessel length overall, chain length paid o

Marine

Parallel Sailing Calculator

Calculate course and distance when sailing due East or West along a parallel of latitude,

Marine

ETA Calculator

Precise estimated time of arrival calculations for your destination port based on distance

Marine

Mercator Sailing Course and Distance Calculator

Determine the true course and distance between two coordinates using Mercator sailing, acc

Marine

Maritime Currency Converter

Convert seafarer salaries across major currencies to compare contracts, calculate allotmen

Marine

Great Circle Sailing Calculator

Calculate the shortest path distance and initial course between two points on the Earth su

Marine

Mercator Sailing Arrival Position Calculator

Swiftly discover your arrival coordinates given your departure position, course, speed and