omacusConvert units by just writing them
Type 3.5 km in miles or 2 cups in ml and the answer appears on the same line. Omacus knows hundreds of units, and it does math with them, so 60 km / 2 hours is a speed.
Omacus is a free notepad calculator for Linux, macOS and Windows. Each line is calculated as you type, and every line keeps its answer, so a recipe, a trip or a spec sheet stays readable.
Quick examples
| You type | Omacus shows |
|---|---|
3.5 km in miles | 2.17 miles |
72 fahrenheit in celsius | 22.22 °C |
2 cups in ml | 473.18 ml |
1 lb in kg | 0.45 kg |
60 mph in km/h | 96.56 km / h |
10 GB / 4 | 2.5 GB |
1 acre in m^2 | 4,046.86 m^2 |
2 hours + 45 min in minutes | 165 minutes |
Length and distance
| You type | Omacus shows |
|---|---|
6 ft in cm | 182.88 cm |
5'11" in cm | 180.34 cm |
26.2 miles in km | 42.16 km |
1 inch in mm | 25.4 mm |
1 nautical mile in km | 1.85 km |
Weight
| You type | Omacus shows |
|---|---|
500 g in oz | 17.64 oz |
2.5 lb in kg | 1.13 kg |
1 metric ton in kg | 1,000 kg |
Temperature
Write fahrenheit and celsius in full, or F and C for short.
| You type | Omacus shows |
|---|---|
350 F in C | 176.67 °C |
20 C in F | 68 °F |
98.6 fahrenheit in celsius | 37 °C |
Cooking and volume
| You type | Omacus shows |
|---|---|
3 tbsp in ml | 44.36 ml |
1 tbsp in tsp | 3 tsp |
750 ml in cups | 3.17 cups |
8 fl oz in ml | 236.59 ml |
1 gallon in liters | 3.79 liters |
Cups, gallons and fluid ounces are US measures. For British ones, say imperial (or UK):
| You type | Omacus shows |
|---|---|
1 imperial pint in ml | 568.26 ml |
40 liters in imperial gallons | 8.8 imperial gallons |
1 uk gallon in gallons | 1.2 gallons |
Speed
| You type | Omacus shows |
|---|---|
100 km/h in m/s | 27.78 m / s |
1 knot in km/h | 1.85 km / h |
Time
| You type | Omacus shows |
|---|---|
90 minutes in hours | 1.5 hours |
30 days in weeks | 4.29 weeks |
1 year in hours | 8,765.81 hours |
Data and storage
Both decimal units (GB, 1,000 MB) and binary ones (GiB, 1,024 MiB) are understood, which is handy when a disk looks smaller than the box said.
| You type | Omacus shows |
|---|---|
1 TB in GB | 1,000 GB |
1 GiB in MB | 1,073.74 MB |
5 MB/s * 10 min in GB | 3 GB |
Area and energy
| You type | Omacus shows |
|---|---|
120 sq ft in m^2 | 11.15 m^2 |
10 square meters in sqft | 107.64 ft^2 |
100 W * 8 hours in kWh | 0.8 kWh |
1 kcal in kJ | 4.18 kJ |
Math with units
Units travel through the math. Divide a distance by a time and you get a speed; divide a distance by fuel economy and you get liters. Add in at the end to choose the unit of the answer.
| You type | Omacus shows |
|---|---|
60 km / 2 hours | 30 km / hour |
1,200 km / 15 km/liter | 80 liters |
2 liters / 250 ml | 8 |
2 hours + 45 min in minutes | 165 minutes |
A recipe, doubled
Name a value once and reuse it below. Change scale and every line updates:
- # Banana bread, doubled
- scale = 22
- Flour: 250 g * scale500 g
- Sugar: 150 g * scale300 g
- Butter: 115 g * scale230 g
- Milk: 0.5 cups * scale in ml236.59 ml
- Bananas: 3 * scale6
- Oven: 350 fahrenheit in celsius176.67 °C
- Bake: 55 min + 10 min65 mins
Questions
How many units does Omacus know?
Hundreds, from everyday ones like miles, cups and pounds to scientific ones like joules, pascals and light years. The unit math comes from fend, an open-source calculator engine.
Are cups and gallons US or imperial?
US by default. Add imperial or UK for the British measures: 2 imperial pints in ml, 40 liters in imperial gallons. Gallons, quarts, pints and fluid ounces all have imperial versions.
Can I convert between units of different kinds?
Only when there's a real relationship, like distance divided by time. Converting cups of flour to grams needs a density, so Omacus doesn't guess.
Does it work offline?
Yes. Unit conversion is calculated entirely on your computer.