ConverTool
A fast, clean unit converter. Type a number and every result updates as you type: no "Convert" button, no system keyboard covering the screen. Free, works offline, no account.
18 categories, 240+ units
Everyday
- Length
- Area
- Volume
- Mass
- Temperature
- Time
On the road
- Speed and running pace (min/km, min/mi)
- Fuel economy (L/100 km, km/L, mpg US and UK)
Science and engineering
- Pressure
- Energy
- Power
- Force
- Torque
- Angle
- Density
Digital
- Data (kB, MB, GB and KiB, MiB, GiB as separate units)
- Data rate
Kitchen
- Cups, glasses and spoons to millilitres
- Cups to grams for 24 ingredients (≈)
Why ConverTool
Results as you type
The target value and every other unit in the category update with each key.
Its own keypad
Digits, decimal point, ±, backspace and swap, always at the bottom of the screen.
Search
Find any unit by name or symbol (psi, inch, oz) and jump straight to it.
Pinned and recent
Keep the conversions you use most, like °C → °F or kg → lb, on the home screen; your latest pairs are one tap away.
Exact definitions
"1 in = 2.54 cm · exact" right under the result. Every factor is taken from its official definition (SI, NIST, BIPM, international agreements).
Readable numbers
Your language's decimal separator and digit grouping, ×10ⁿ for very large or very small values, and 4, 7 or 10 significant digits.
Copy and share
Copy the result with one key, or share the conversion.
Kitchen, clearly marked
Ingredient weights come from USDA FoodData Central. Kitchen results are always marked as approximate (≈), and approximate values never appear in the other categories.
Private, works offline
No account, no sign-up, no internet needed. Your pinned and recent pairs stay on your device: only the units, never the numbers you type. The app shows a small, non-personalised banner ad.
Light and dark, 12 languages
English, Türkçe, Kurdî (Kurmancî), Azərbaycan dili, Kiswahili, Español, Português, Français, Deutsch, Русский, Bahasa Indonesia and Italiano.
Results are rounded to the number of significant digits you choose. Kitchen results are approximate: they depend on the ingredient and how the cup is filled.