Unit Converter
Convert between units of measurement
How to Use Unit Converter
- Open Unit Converter above — it loads instantly, no signup or download required.
- Provide your input (paste text, drop a file, or type directly into the tool).
- Get your result instantly — everything is processed locally in your browser and nothing is uploaded.
- Copy or download the output. Refresh the page to clear all data from memory.
About Unit Converter
What this page solves
Googling "3.5 miles to km" opens a page of ads to answer a one-line question. This converter handles length, weight, temperature, volume, area, speed and time in one keystroke-driven UI.
Unit Converter handles length, weight, temperature, volume, area, speed and time conversions using exact conversion factors — 1 mile = 1609.344 m, °F = °C × 9/5 + 32, 1 lb = 0.45359237 kg — so results match SI and NIST definitions to the last decimal, not rounded shortcuts. The UI is keystroke-driven: pick a category, type a value, both sides update as you type, and every common unit is one click away — no dropdown-hunting for "how many milliliters in a US cup". It is built for the practical moments people convert units: cooking from a recipe in the wrong measurement system, checking a shipping weight against a courier limit, sizing furniture in inches when the room was measured in cm, or verifying a scientific result across metric and imperial. Pair it with the Data Storage Converter for bytes/KB/MB/GB math, or the Timezone Converter for time-of-day (not duration) conversion. Runs entirely in your browser — no upload, no signup, no logs.
Common Use Cases
- Convert a recipe from cups & ounces to grams & milliliters
- Check a package weight in pounds against a kg-based courier limit
- Size IKEA furniture measured in cm to fit a room measured in feet
- Convert cruising speed from knots to km/h for a flight or sailing trip
- Translate Fahrenheit oven temperatures to Celsius for a European oven
Related tools in Calculators
- Age CalculatorCalculate exact age from date of birth
- BMI CalculatorCalculate Body Mass Index with visual scale
- Loan EMI CalculatorCalculate monthly loan EMI, total interest and payments
- Compound Interest CalculatorCalculate compound interest and growth over time
See all Calculators.
Frequently asked questions
How to use Unit Converter?
1) Open the tool. 2) Enter or upload your input. 3) Get your result instantly. Everything happens locally — nothing is uploaded.
When should I use Unit Converter?
Use it when following a recipe in a different unit system, converting travel distances, sizing furniture, or checking scientific measurements across metric and imperial.
Is Unit Converter safe?
Yes. Unit Converter runs 100% in your browser. Inputs are never uploaded, stored, or logged — safe for confidential content.
Will quality be affected by Unit Converter?
Unit Converter performs lossless operations — your content is not re-encoded or downgraded.
What formats does Unit Converter support?
Unit Converter supports all common formats — paste, type, or load from a file.
Is Unit Converter free?
Yes — Unit Converter is completely free, with no registration, no watermarks, and no usage limits.
Which units are supported?
Length (mm/cm/m/km/in/ft/yd/mi/nmi), weight (mg/g/kg/t/oz/lb/st), temperature (°C/°F/K), volume (ml/L/US & UK gal/qt/pt/cup/fl oz), area (m²/ha/km²/ft²/acre/mi²), speed (m/s, km/h, mph, kn) and time (s/min/h/d/wk/mo/yr).
Are the conversion factors exact?
Yes — factors are the SI/NIST-defined ratios (1 in = 25.4 mm exactly, 1 lb = 0.45359237 kg exactly). Rounding only happens in the display, not the math.
US or UK gallons?
Both — US gallon (3.785 L) and Imperial/UK gallon (4.546 L) are listed as separate units so a US recipe and a UK petrol tank convert correctly.