Converting Units

Use to or in or as to convert into a particular unit.

10 km in m                    | 10,000 m
5 hours 30 minutes to seconds | 19,800 seconds
100 pounds in kg              | 45.36 kg

Or alternatively:

meters in 10 km  | 10,000 m
days in 3 weeks  | 21 days
seconds in a day | 86,400 s

As a shorthand, you can also type two unit names without values to see the conversion:

"km m" (= 1,000 m)

Soulver uses unit symbols (rather than its full name) in the answer column.

Control-click on an answer to see the full unit name

Notes on Units

Mixing Units & Plain Numbers

When mixing plain numbers with units, the nearest unit will be used automatically. This is called unit assimilation.

300 + 20 km | 320 km
$20 + 30    | $50.00

Adding & Subtracting Mixed Units

When doing calculations with mixed unit types, the larger unit wins:

1km + 1,000m | 2 km

When units don't share a common base unit, the last used unit wins:

$200 + €200 | €308.84

Multiplying Units

Soulver only supports units that have been pre-defined in its math engine, not compound units that do "not exist":

10m × 10m       | 100 m² // area, a supported unit type
3 kg × 3 liters | // Not "9 kg liters", this unit does not exist

Soulver will make an implicit rate when a supported unit cannot be created through multiplication:

$30 × 4 days | $120.00
// the above is interpreted as $30/day × 4 days

Creating Custom Units

You can add additional units to Soulver in the Calculator > Custom Units settings.

Custom units are defined in terms of an existing units.

You cannot add new unit categories to Soulver (yet).