Unit Converter
Convert between 80+ units across length, weight, temperature, digital data (MB/GB/TB), speed, time, volume, and area. Includes a tip calculator with bill splitting and percentage presets.
Why Use Unit Converter?
Every developer has Googled "5 ft 10 in in cm" and ended up on an ad-heavy site with pop-ups. This converter runs in the browser with no network round-trip and covers the units developers actually hit: MB↔GiB for bandwidth calculations, ms↔seconds for timeouts, px↔pt for typography. It also handles the units you only deal with once a year — acres to square meters when a designer sends a site plan, knots to km/h when scanning flight data, or Mbps to MB/s when checking ISP claims. Precise SI factors and up-to-12-digit output mean you can trust the result for engineering work.
How to Use Unit Converter
- Select the conversion category from the tabs at the top: Length, Weight, Temperature, Data, Speed, Time, Volume, Area, or Tip Calculator.
- Choose the 'From' and 'To' units using the dropdown menus, then enter the value you want to convert.
- The result appears instantly. Use the swap button to reverse the conversion direction, or copy the result to your clipboard.
Worked Examples
API rate limit converted to daily request cap
Time: 100 requests/second → requests/day
8,640,000 requests/day
Useful for planning quotas against provider caps.
Convert a download speed to real-world throughput
Data: 1 Gbps (gigabit) → MB/s (megabyte)
125 MB/s
ISP ads use bits, but file size tools use bytes — the 8× factor catches most people off guard.
Inch-to-cm for a UI spec
Length: 14 in → cm
35.56 cm
Handy when collaborating with designers using mixed unit systems.
About Unit Converter
The Unit Converter is a comprehensive, all-in-one tool that handles conversions across 9 different categories with over 80 unit types. Convert between metric and imperial measurements for length (millimeters to miles), weight (grams to pounds), temperature (Celsius, Fahrenheit, Kelvin), digital data (bytes to terabytes, bits to megabits), speed (km/h to mph to knots), time (milliseconds to years), volume (milliliters to gallons, teaspoons to liters), and area (square meters to acres). The tool also includes a full-featured Tip Calculator with bill splitting, percentage presets, and per-person calculations. Every conversion uses precise mathematical formulas with smart number formatting that switches between decimal and scientific notation based on the magnitude of the result. All calculations happen instantly in your browser — no server, no delays, no rounding errors.
Troubleshooting & Common Issues
Data conversion looks wrong — I expected 1 GB to be 1000 MB
The tool uses the binary (IEC) convention: 1 GiB = 1024 MiB = 1,073,741,824 bytes. Hard drive manufacturers use the decimal (SI) convention — that's why a "500 GB" drive shows as ~465 GiB in your OS. Toggle between the two modes in the converter settings based on which system you're comparing against.
Temperature delta converts incorrectly
Temperature scales have different zero points, so a temperature *value* (°C → °F) is not the same conversion as a temperature *change* (Δ°C → Δ°F). This tool converts values. For deltas, drop the zero-point offset and multiply by the scale factor (Δ°F = Δ°C × 1.8).
Result shows scientific notation when I want a decimal
Very large or very small results default to scientific notation to stay readable (e.g., 1.5e-9 instead of 0.0000000015). Copy the number out and paste it elsewhere — the underlying value is exact. Or switch units to something closer in magnitude (nanoseconds instead of seconds).
Imperial fluid ounce vs. US fluid ounce differs by a few mL
UK and US fluid ounces are not identical: 1 US fl oz ≈ 29.57 mL, 1 UK fl oz ≈ 28.41 mL. The converter defaults to US fluid ounces. If you're converting a British recipe, switch to the UK/imperial setting.
Frequently Asked Questions
How accurate are the conversions?
Our converter uses the official SI conversion factors with full floating-point precision (up to 12 significant digits). Results are formatted using smart precision to avoid unnecessary trailing zeros while maintaining accuracy.
Does the temperature converter handle negative values?
Yes! Temperature conversion correctly handles negative values for all three scales (Celsius, Fahrenheit, Kelvin). For example, -40°C correctly converts to -40°F — the point where both scales intersect.
What data units are supported?
We support both binary (1 KB = 1024 bytes) and bit-based units: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte, Petabyte, Bit, Kilobit, and Megabit. This covers all common use cases from file sizes to network speeds.
How does the tip calculator work?
Enter your bill amount, select a tip percentage (or use presets for 10%, 15%, 18%, 20%, 25%), and optionally split between multiple people. The calculator shows the tip amount, total, per-person cost, and per-person tip.
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