FAQ
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?+
Select the Temperature tab, enter your °C value, then choose Fahrenheit as the output unit. The formula used is °F = (°C × 9/5) + 32, and it's shown directly under the result so you can double-check it by hand.
How many miles is 1 kilometer?+
1 kilometer equals 0.621371 miles. You can get this instantly using the Distance tab with kilometers selected as the input and miles as the output, or check the quick-reference values shown below the converter.
How accurate are UnitPortal's conversions?+
UnitPortal uses the exact defined conversion factor for each unit pair (for example, 1 inch is exactly 2.54 cm by international definition) rather than rounded approximations, so results stay precise even at large or very small values.
Is UnitPortal free to use?+
Yes — all six conversion categories are completely free with no sign-up required. UnitPortal Pro is an optional paid tier for users who want an ad-free experience.
Does UnitPortal work offline?+
All conversions run in your browser using JavaScript that's already loaded, so once the page has loaded once, calculations continue to work without a live internet connection for that session.
What unit categories does UnitPortal support?+
Temperature, distance, weight, speed, volume, and area, covering more than 50 individual units in total, from everyday units like Celsius and pounds to specialized ones like nautical miles and hectares.
Does UnitPortal store or send my data anywhere?+
No. Every conversion happens locally in your browser — the values you type are never transmitted to a server. See the Privacy Policy for full details on analytics and advertising cookies.
Why do my results differ slightly from another converter?+
Small differences usually come from when rounding happens. UnitPortal calculates at full precision internally and rounds only the final displayed result, so it typically matches or is more precise than tools that round earlier in the calculation.