How to convert units on a scientific calculator
Sumi has 40 unit conversions built in. Type a value, choose a conversion from the ••• menu, and tap =. Here’s 12 inches in centimetres.
Convert a value
- Type the value, such as 1 2.
- Tap •••, then Conversions.
- Type the conversion’s two-digit number, 0 1 for inches to centimetres, or tap it in the list.
- Tap =. The answer is 30.48.
More examples:
- 100 °F to °C (code 37): 37.77777778
- 20 °C to °F (code 38): 68
- 1 ft to m (code 03): 0.3048
To convert a result you’ve just calculated, tap ••• Conversions and the code straight after it, then =. Sumi carries on from Ans.
Every conversion
Each pair converts both ways. The first code goes left to right, and the next code goes back.
- Length: in ▸ cm (01, 02), ft ▸ m (03, 04), yd ▸ m (05, 06), mile ▸ km (07, 08), n mile ▸ m (09, 10), pc ▸ km (17, 18)
- Area: acre ▸ m² (11, 12)
- Volume: gal (US) ▸ ℓ (13, 14), gal (UK) ▸ ℓ (15, 16)
- Speed: km/h ▸ m/s (19, 20)
- Mass: oz ▸ g (21, 22), lb ▸ kg (23, 24)
- Pressure: atm ▸ Pa (25, 26), mmHg ▸ Pa (27, 28), kgf/cm² ▸ Pa (31, 32), lbf/in² ▸ kPa (35, 36)
- Power: hp ▸ kW (29, 30)
- Energy: kgf·m ▸ J (33, 34), J ▸ cal (39, 40)
- Temperature: °F ▸ °C (37, 38)
Why is my conversion slightly different from another calculator?
Most factors are exact by definition, such as 2.54 cm to the inch. Seven are rounded to seven significant figures: acre, US gallon, parsec, ounce, pound, mmHg and lbf/in². Two depend on a chosen value: Sumi uses 4.1858 J per calorie and 0.7457 kW per horsepower. Check which definition your textbook or specification uses.
For values like the speed of light, see how to use scientific constants.
