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  2. MRO to SLL
  3. 100,000 MRO

Convert 100,000 Old Mauritanian Ouguiya (MRO) to Old Sierra Leonean Leone (SLL)

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

The Old Mauritanian Ouguiya is no longer in use

Old Mauritanian Ouguiya (MRO) was replaced by the Mauritanian Ouguiya (MRU) in 2018. For today’s money, convert 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 MRO to SLE.

100,000 old Mauritanian ouguiyas =

6,438,211.60 SLL 0.00% today

1 MRO = 64.3821 SLL · 1 SLL = 0.0155323 MRO

Mid-market rate, updated 16:59 UTC. Paid plans update as often as every 60 seconds. Get MRO→SLL rates via API

MRO to SLL over the last year

63.5064.0064.50Nov ’25Jan ’26Mar ’26May ’26Jul ’26Sep ’26
52-week high
64.429
52-week low
63.274
52-week average
63.882
Change over the year
+1.37%

Conversion tables

MRO to SLL
MRO SLL
1 MRO 64.38 SLL
10 MRO 643.82 SLL
100 MRO 6,438.21 SLL
1,000 MRO 64,382.12 SLL
10,000 MRO 643,821.16 SLL
50,000 MRO 3,219,105.80 SLL
100,000 MRO 6,438,211.60 SLL
SLL to MRO
SLL MRO
1 SLL 0.01553 MRO
10 SLL 0.1553 MRO
100 SLL 1.55 MRO
1,000 SLL 15.53 MRO
10,000 SLL 155.32 MRO
50,000 SLL 776.61 MRO
100,000 SLL 1,553.23 MRO

Get MRO→SLL rates via API

The live rate, the rate on any past day or a whole range, for SLL 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=MRO -d currencies=SLL \
  -H "apikey: YOUR-API-KEY"

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

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Questions about MRO to SLL

How much is 100,000 MRO in SLL?

100,000 old Mauritanian ouguiyas is 6,438,211.60 old Sierra Leonean leones at the mid-market rate of 4 October 2026, 16:59 UTC, when 1 MRO = 64.3821 SLL.

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

Over the last 52 weeks 1 MRO ranged from 63.2743 to 64.4295 SLL, 63.8817 SLL on average.

Which exchange rate is this?

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