Unit conversion: length, weight, volume and temperature
Need to switch between metric and imperial? Enter a value, pick the units and get the converted result instantly with the factor shown. The tool covers the everyday swaps you meet in recipes, DIY, travel and school: meters to feet, kilograms to pounds, liters to gallons and Celsius to Fahrenheit, all with the exact factor so you can check the math instead of trusting a rounded number.
How it works
Every unit in one category shares a base (meters for length, grams for weight, milliliters for volume, seconds for time). The calculator turns your value into base units by multiplying by the from-factor, then divides by the to-factor to get the target. Temperature is different because 0 C is 32 F, so you first shift to Celsius and then to the target. Choose length, weight, volume, temperature or time, enter the number and the two units; the result, the base value and the formula are shown together so you can reuse the factor without reopening the tool.
The math
For length, weight, volume and time the conversion is a single ratio: result = value x fromFactor / toFactor. For temperature the offset matters: C = (F - 32) x 5/9 and K = C + 273.15, so you must add or subtract before scaling. The factors are exact definitions (1 inch = 2.54 cm, 1 lb = 453.59237 g, 1 gal US = 3785.411784 ml) so the result is reproducible.
FromFactor and ToFactor are the unit sizes in base units. Temperature first normalizes to Celsius, then converts to the target.
Examples
Example 1: 5 km to miles
- Value: 5 km, fromFactor 1000, toFactor 1609.344
- Base = 5 x 1000 = 5000 m
- Result = 5000 / 1609.344 = 3.10686 mi
Example 2: 70 kg to pounds and 20 C to Fahrenheit
- Weight: 70 kg x 1000 / 453.592 = 154.323 lb
- Temperature: 20 C x 9/5 + 32 = 68 F
When to use it
✦ Travel and Navigation
Convert miles to kilometers for road trips and feet to meters for hiking profiles without mental math.
✦ Cooking and Lab Work
Switch grams to ounces and milliliters to cups so a US recipe works with a European scale.
✦ School Equivalences
Check equivalences for homework (meters, liters, grams) and see the factor, not just the answer.
⚠ Common mistakes
- Forgetting temperature offset: 20 C is 68 F, not 20 x 5/9.
- Mixing mass and weight without factor: 1 kg is 2.20462 lb, not 2.
FAQ (6)
How do I convert units?
Multiply by from-factor to get base units, then divide by to-factor to get the target.
Why does temperature need a different formula?
Because 0 C is 32 F, you must shift the zero before scaling.
Are the calculations performed on CalcTracker safe for my privacy?
Yes, all calculations on CalcTracker run exclusively on your local device within the web browser. None of the entered data is sent to external servers or stored remotely. The application is entirely offline-first.
Can I use CalcTracker in offline mode on my smartphone?
Absolutely. CalcTracker is designed as a lightweight, progressive-style web application. Once the page is loaded for the first time, all calculators remain ready to use and fully functional even in the complete absence of an internet connection.
Are the results provided by the calculators accurate for official use?
Our calculators use standard mathematical formulas and verified equations. However, for critical financial, banking, or tax decisions (such as exact car tax or net salary calculations), we always advise consulting with a certified professional or referencing official government portals.
How can I share a specific calculation with someone else?
Simply click the "Share Link" button located in the results panel after performing a calculation. The values entered into the form will be encoded directly into the URL query parameters, allowing anyone who opens the link to see the exact same results instantly.