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Free unit converters & everyday calculators

Convert any unit or run a quick calculation in seconds. Results update as you type, work on any device and use exact conversion factors.

Most popular tools

Kilometers to Miles Converter1 km = 0.6213712 mi Miles to Kilometers Converter1 mi = 1.609344 km Centimeters to Inches Converter1 cm = 0.3937008 in Inches to Centimeters Converter1 in = 2.54 cm Meters to Feet Converter1 m = 3.28084 ft Kilograms to Pounds Converter1 kg = 2.204623 lb Pounds to Kilograms Converter1 lb = 0.4535924 kg Ounces to Grams Converter1 oz = 28.34952 g Celsius to Fahrenheit Converter1 °C = 33.8 °F Fahrenheit to Celsius Converter1 °F = -17.22222 °C Liters to Gallons Converter1 L = 0.2641721 gal Tip calculatorEnter the bill, choose a tip percentage and the number of people.Percentage calculatorThree calculators in one.Sales tax & VAT calculatorChoose a country or province, enter a price and decide whether to add tax to it or remove the tax already included.

Unit converters by category

Length

All length units

Weight

All weight units

Temperature

All temperature units

Volume

All volume units

Area

Speed

All speed units

Data storage

All data storage units

Pressure

All pressure units

Energy

All energy units

Everyday calculators

Tip calculatorEnter the bill, choose a tip percentage and the number of people.Percentage calculatorThree calculators in one.Sales tax & VAT calculatorChoose a country or province, enter a price and decide whether to add tax to it or remove the tax already included.Discount calculatorEnter the original price and the discount.

Blog

Tire Pressure in bar, psi and kPa, ExplainedWhy tire pressure is shown in bar, psi or kPa, how to convert between them, and how to read the pressure your car actually needs.November 11, 2026

Why people use Calcoala

Instant and accurate

Results appear as you type, using exact international definitions for every unit.

Calm and clutter-free

No pop-ups and no ads covering the tool. Ads stay in their own column, away from your numbers.

Explained, not just computed

Every tool shows the formula, worked examples, a conversion table and answers to common questions.