Length Converter
Convert between mm, cm, m, km, inch, foot, yard, and mile.
Weight Converter
Convert between mg, g, kg, oz, lb, and metric ton.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin with quick reference.
Volume Converter
Convert between mL, L, gallons, fl oz, cup, tbsp, tsp, and m³.
Area Calculator
Calculate area of rectangle, triangle, circle, and trapezoid. Multiple units.
Speed Calculator
Convert between m/s, km/h, mph, knots, and ft/s.
Time Zone Converter
Convert time between 30+ major world time zones instantly.
Data Storage Converter
Convert between bit, byte, KB, MB, GB, TB, PB. Binary or Decimal.
Pressure Converter
Convert between Pascal, Bar, PSI, ATM, mmHg, and Torr.
Energy Converter
Convert between Joule, kJ, cal, kcal, Wh, kWh, eV, and BTU.
Power Calculator
Convert between Watt, kW, MW, Horsepower, and BTU/h.
Force Calculator
Convert between Newton, dyne, pound-force, and kip.
Density Calculator
Calculate density from mass and volume. Includes material reference table.
Percentage Calculator
Calculate percentages, percentage increase, decrease, and proportions.
Tip Calculator
Calculate tips and split bills easily.
Mortgage Calculator
Estimate monthly mortgage payments and total interest.
Fuel Calculator
Calculate fuel consumption, cost, and efficiency.
Speed-Distance-Time Calculator
Solve for speed, distance, or time given the other two values.
Quadratic Solver
Solve quadratic equations and find roots with step-by-step display.
Pythagorean Calculator
Calculate the missing side of a right triangle using the Pythagorean theorem.
Ratio Calculator
Simplify ratios, find missing values, and scale proportions.
Proportion Calculator
Solve proportions and cross-multiply to find unknown values.
Significant Figures
Round numbers to significant figures with proper scientific notation.
Scientific Notation Converter
Convert between decimal and scientific notation.
Angle Calculator
Calculate angles in degrees and radians. Includes trig functions.