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Professional online calculators for math, finance, health, and more. Free, fast, and beautifully designed.
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pH Calculator - Free Online pH, pOH, H+ and OH- Calculator
Calculate pH from H+ concentration or vice versa. Also compute pOH and OH- values instantly. Essential tool for chemistry students and labs.
Ideal Gas Law Calculator - Free Online PV=nRT Calculator
Calculate pressure, volume, moles, or temperature using the ideal gas law PV=nRT. Supports multiple units with step-by-step solutions.
Profit Margin & Markup Calculator - Free Online Sales Calculator
Calculate profit margins, markups, selling prices, and cost prices instantly. Essential tool for sales executives and business owners.
Ohm's Law Calculator - Free Voltage, Current, Resistance & Power Calculator
Calculate voltage, current, resistance, and power using Ohm's Law. Essential electrical engineering tool with interactive formulas and circuit examples.
Thread Pitch Calculator - Free Online Thread Specification Calculator
Calculate thread specifications including pitch diameter, thread depth, and dimensions for metric and imperial threads with our professional calculator.
Wire Gauge Calculator - Free Online AWG & mm² Wire Size Calculator
Calculate the correct wire gauge (AWG/mm²) for your electrical project based on current, length, and voltage drop. Essential tool for electrical safety.
Triangle Area Calculator - Free Online Geometry Calculator
Calculate triangle area using multiple methods: base-height, three sides (Heron's formula), or coordinates. Perfect for students and educators.
Circle Calculator - Free Online Circle Area & Circumference Calculator
Calculate circle area, circumference, diameter, and radius instantly. Free online circle calculator with visual diagram and step-by-step solutions.
Rectangle & Square Calculator - Free Online Area, Perimeter & Diagonal Calculator
Calculate rectangle and square area, perimeter, and diagonal length instantly. Free online calculator with visual diagrams and step-by-step solutions.
Pythagorean Theorem Calculator - Free Online Right Triangle Calculator
Calculate missing sides of right triangles using the Pythagorean theorem. Find hypotenuse or legs with our free visual calculator and step-by-step solutions.
Polygon Area Calculator - Free Online Regular Polygon Calculator
Calculate area and perimeter of regular polygons (pentagon, hexagon, octagon, etc.). Free calculator with visual diagrams and formulas.
3D Volume Calculator - Free Online Cube, Sphere, Cylinder & Cone Calculator
Calculate volume and surface area of 3D shapes including cubes, spheres, cylinders, cones, and pyramids. Free calculator with visual diagrams.
Recently Added.
Scale Model Calculator - Free Online Scale Conversion Tool
Convert between model scale and real-world dimensions. Perfect for architecture, model trains, cars, and miniatures.
Map Distance Calculator - Free Online Map Scale Tool
Convert map measurements to real-world distances using map scales. Perfect for geography students, hikers, and travelers.
Athletic Track Distance Calculator - Free Online Track & Field Tool
Calculate running distances on athletic tracks. Convert laps to meters, miles, and kilometers for standard and non-standard tracks.
Fabric Length Converter - Free Online Sewing Calculator
Convert fabric measurements between yards, meters, inches, and centimeters. Calculate fabric requirements for sewing and crafts projects.
Construction Measurement Calculator - Free Building Calculator
Convert between feet-inches notation and decimals. Calculate board feet, square footage, and construction measurements.
Scientific Notation Length Converter - Free Online Calculator
Convert very large and small lengths using scientific notation. Perfect for astronomy, physics, and microscopy measurements.
Pace Length Calculator - Free Walking & Running Calculator
Calculate your pace length, stride distance, and step count. Convert between steps and distance for walking and running.
Celsius to Fahrenheit Converter - Free Online Temperature Calculator
Convert temperatures between Celsius and Fahrenheit instantly. Perfect for science classes, cooking, and weather comparisons.
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