CalculatorCamp

7 tools

Universal Unit Converters

Any unit → any unit: length, weight, time, and more.

The universal converters on this page handle an entire unit family at once. Instead of hunting for a separate page for every pair, pick the family (length, weight, temperature, time, volume, area, or speed), enter a value, and switch freely between metric and imperial units.

Every conversion runs through a single base unit — metres for length, kilograms for mass, seconds for time — using the exact factors published in the SI Brochure and NIST SP 811. That means 1 inch is always 2.54 cm, 1 mile is always 1609.344 m, and there is no accumulated rounding between steps. Results are rounded only for display.

If you already know the exact pair you need (feet to cm, kg to lbs, °C to °F), the quick-link categories below give you a dedicated page with a worked example and formula for that conversion.

All universal unit converters

Pick a tool to see the calculator, formula, worked example, and FAQs.

Universal Length Converter (All Units) Convert mm, cm, m, km, in, ft, yd, mi — includes feet → cm. Universal Weight Converter (All Units) Convert mg, g, kg, oz, lb, stone, tonnes. Universal Temperature Converter (All) Convert °C, °F, K, and Rankine. Universal Time Converter (All Units) Convert ms, seconds, minutes, hours, days, weeks, months, years. Universal Volume Converter (All Units) Convert ml, L, cups, tsp, tbsp, pints, quarts, gallons. Universal Area Converter (All Units) Convert mm², cm², m², ft², acres, hectares, and more. Universal Speed Converter (All Units) Convert m/s, km/h, mph, knots, ft/s.

Explore other categories

More free tools across health, finance, math, and unit conversion.

12 tools Health & Fitness BMI, macros, protein, pace, sleep, and more. 8 tools Length Converters Popular length pairs including feet ↔ cm. 6 tools Weight Converters Popular weight pairs like kg ↔ lbs. 4 tools Temperature Converters Celsius, Fahrenheit, Kelvin shortcuts. 5 tools Time Converters Seconds ↔ HH:MM:SS and other time shortcuts. 2 tools Speed Converters km/h ↔ mph shortcuts. 4 tools Volume Converters Liters, gallons, cups shortcuts. 3 tools Area Converters m², ft², acres shortcuts. 4 tools Science Units Pressure, energy, power, and angles. 1 tools Data Size Convert bytes, KB, MB, GB, and TB. 1 tools Cooking & Baking Ingredient cup ↔ gram style conversions. 8 tools Finance Tips, discounts, EMI, tax, salary, interest. 11 tools Everyday Math Percentages, age, GPA, averages, and more.