Online unit converter

⏱️ Timestamp 📏 Length 🌡️ Temperature ⚖️ Weight 📐 Area 🧪 Volume 💾 Data storage 🚀 Speed

⏱️ Timestamp conversion

Convert between Unix timestamps (seconds / milliseconds) and date-time values · Defaults to UTC; choose another time zone if needed

Display time zone

Defaults to UTC. Your selection applies to the conversions below and is saved locally.

UTC--

Timestamp (seconds)--

Timestamp (milliseconds)--

📅 Date-time → timestamp

Choose a date and time

Or enter a date-time string (takes priority when provided)

Dates are interpreted in the selected time zone. Ambiguous or nonexistent times during daylight-saving transitions produce an error. Supports YYYY-MM-DD and YYYY-MM-DD HH:mm:ss.

🔢 Timestamp → date-time

Enter timestamp

Unit

Auto-detection uses digit count only. Select the unit manually for early millisecond timestamps or longer second timestamps.

📏 Length conversion

Convert metric, imperial and Chinese customary length units

⇄

🌡️ Temperature conversion

Convert Celsius, Fahrenheit and Kelvin

⇄

⚖️ Weight conversion

Convert metric and imperial weight units

⇄

📐 Area conversion

Convert square meters, square kilometers, hectares, mu, acres and more

⇄

🧪 Volume conversion

Convert liters, milliliters, cubic meters, gallons and more

⇄

💾 Data storage conversion

Convert bytes, KB, MB, GB, TB and PB

⇄

🚀 Speed conversion

Convert km/h, m/s, mph and knots

⇄

Unit conversion for everyday work and development

Unit conversion is easy to get wrong when factors or timestamp units are unclear. These eight converters bring temperature, length, weight, data storage, timestamps and more together with immediate results.

Choose the units and enter a value, including decimals. Use the tools for everyday measurements or quick checks during development and testing. Confirm the measurement system and precision needed for your task.

Eight categoriesTimestamps, length, temperature, weight, area, volume, data storage and speed

Instant conversionEnter a value and select units to calculate the result immediately

Decimal inputAccepts decimals; displayed results are rounded, so verify the precision required for your task

Two-way conversionChoose any supported source and target unit, or swap them

Local calculationCalculations run in your browser without sending tool inputs over the network

Type	Main units	Typical use
Timestamp conversion	Seconds / milliseconds / date-time	Debugging logs and API parameters
Length	Millimeters, centimeters, meters, kilometers, feet	Home projects, renovation and engineering
Temperature	Celsius, Fahrenheit, Kelvin	Weather, cooking and experiments
Weight	Grams, kilograms, jin, pounds, ounces	Shopping, cooking and fitness
Area	Square meters, square feet, mu, hectares	Housing, farmland and property
Volume	Milliliters, liters, gallons, cubic meters	Liquids, storage, transport and irrigation
Data storage	Bytes, KB, MB, GB, TB	Files, drives and capacity estimates
Speed	Meters per second, kilometers per hour, miles per hour	Travel, weather and sports

How do I convert a value?

Select the source unit, enter a value and choose the target unit. The result appears immediately. Both units are selected from dropdown menus.

Choose a category at the top, such as data storage
Enter a value and choose the source unit, such as 1 GB
Choose the target unit, such as MB, to see the result
Check both units and use the swap button for reverse conversion if needed

Which units are supported?

The eight categories cover common units from timestamp seconds and milliseconds to bytes and terabytes, plus everyday measures such as pounds, miles, gallons and Chinese customary units.

Is a timestamp in seconds or milliseconds?

Both are supported, along with conversion to and from calendar date-time values. Select the correct unit when entering a timestamp, such as a 13-digit millisecond or 10-digit second value.

How precise are the results?

The page uses built-in conversion factors or temperature formulas and rounds displayed results. Verify the required precision for engineering or measurement tasks; website output does not replace calibrated instruments.

Can I convert several values at once?

Enter one value and one source unit at a time. Convert mixed notation such as feet and inches into a single unit first. Swap the source and target units for reverse conversion.

Privacy: Conversions run locally in your browser. Entered units and values are not uploaded to a server for tool processing.