Convert 100 Old Sierra Leonean Leone (SLL) to Optimism (OP)

Convert old Sierra Leonean leones to Optimism at the live mid-market rate. Reverse: OP to SLL

The Old Sierra Leonean Leone is no longer in use

Old Sierra Leonean Leone (SLL) was replaced by the Sierra Leonean Leone (SLE) in 2022. For today’s money, convert SLE to OP.

Amount

From

100 old Sierra Leonean leones =

0.03226 OP +1.28% today

1 SLL = 0.00032261 OP · 1 OP = 3,099.74 SLL

Mid-market rate, updated 07:02 UTC. Paid plans update as often as every 60 seconds. Get SLL→OP rates via API

SLL to OP over the last year

52-week high: 0.00053319
52-week low: 0.00005811
52-week average: 0.00030169
Change over the year: +429.59%

Conversion tables

SLL to OP
SLL	OP
1 SLL	0.0003226 OP
10 SLL	0.003226 OP
100 SLL	0.03226 OP
1,000 SLL	0.3226 OP
10,000 SLL	3.22607300 OP
50,000 SLL	16.13036500 OP
100,000 SLL	32.26073000 OP

OP to SLL
OP	SLL
1 OP	3,099.74 SLL
10 OP	30,997.44 SLL
100 OP	309,974.40 SLL
1,000 OP	3,099,743.98 SLL
10,000 OP	30,997,439.82 SLL
50,000 OP	154,987,199.10 SLL
100,000 OP	309,974,398.21 SLL

Get SLL→OP rates via API

The live rate, the rate on any past day or a whole range, for OP and 170+ other currencies, as JSON. Free plan included. See the exchange rate API.

Get a free API key API documentation

curl https://api.currencyapi.com/v3/latest \
  -G -d base_currency=SLL -d currencies=OP \
  -H "apikey: YOUR-API-KEY"

# the rate on a past day
curl https://api.currencyapi.com/v3/historical \
  -G -d base_currency=SLL -d currencies=OP \
  -d date=2025-10-04 \
  -H "apikey: YOUR-API-KEY"

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Questions about SLL to OP

How much is 100 SLL in OP?

100 old Sierra Leonean leones is 0.03226 Optimism at the mid-market rate of 4 October 2026, 07:02 UTC, when 1 SLL = 0.00032261 OP.

What was the SLL to OP rate over the last year?

Over the last 52 weeks 1 SLL ranged from 0.00005811 to 0.00053319 OP, 0.00030169 OP on average.

Which exchange rate is this?

The mid-market rate: the midpoint between what currency markets pay and ask for SLL/OP, without the margin a bank or card issuer adds, so the rate you are charged is usually a little worse.