Convert 1 Old Sierra Leonean Leone (SLL) to Mauritanian Ouguiya (MRU)

Convert old Sierra Leonean leones to Mauritanian ouguiyas at the live mid-market rate. Reverse: MRU 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 MRU.

Amount

From

1 Old Sierra Leonean Leone =

0.001738 MRU −0.42% today

1 SLL = 0.00173773 MRU · 1 MRU = 575.464 SLL

Mid-market rate, updated 11:21 UTC. Paid plans update as often as every 60 seconds. Get SLL→MRU rates via API

SLL to MRU over the last year

52-week high: 0.0017738
52-week low: 0.0017225
52-week average: 0.0017520
Change over the year: −1.36%

Conversion tables

SLL to MRU
SLL	MRU
1 SLL	0.001738 MRU
10 SLL	0.01738 MRU
100 SLL	0.1738 MRU
1,000 SLL	1.74 MRU
10,000 SLL	17.38 MRU
50,000 SLL	86.89 MRU
100,000 SLL	173.77 MRU

MRU to SLL
MRU	SLL
1 MRU	575.46 SLL
10 MRU	5,754.64 SLL
100 MRU	57,546.43 SLL
1,000 MRU	575,464.26 SLL
10,000 MRU	5,754,642.59 SLL
50,000 MRU	28,773,212.97 SLL
100,000 MRU	57,546,425.95 SLL

Get SLL→MRU rates via API

The live rate, the rate on any past day or a whole range, for MRU 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=MRU \
  -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=MRU \
  -d date=2025-10-04 \
  -H "apikey: YOUR-API-KEY"

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Questions about SLL to MRU

How much is 1 SLL in MRU?

1 Old Sierra Leonean Leone is 0.001738 Mauritanian ouguiyas at the mid-market rate of 4 October 2026, 11:21 UTC, when 1 SLL = 0.00173773 MRU.

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

Over the last 52 weeks 1 SLL ranged from 0.00172245 to 0.0017738 MRU, 0.00175201 MRU on average.

Which exchange rate is this?

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