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Convert 10 Old Mauritanian Ouguiya (MRO) to Sierra Leonean Leone (SLE)

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

10 old Mauritanian ouguiyas =

0.6455 SLE 0.00% today

1 MRO = 0.064553 SLE · 1 SLE = 15.4911 MRO

Mid-market rate, updated 11:41 UTC. Paid plans update as often as every 60 seconds. Get MRO→SLE rates via API

MRO to SLE over the last year

0.0640.0660.068Nov ’25Jan ’26Mar ’26May ’26Jul ’26Sep ’26
52-week high
0.069048
52-week low
0.063445
52-week average
0.064353
Change over the year
−0.97%

Conversion tables

MRO to SLE
MRO SLE
1 MRO 0.06455 SLE
10 MRO 0.6455 SLE
100 MRO 6.46 SLE
1,000 MRO 64.55 SLE
10,000 MRO 645.53 SLE
50,000 MRO 3,227.65 SLE
100,000 MRO 6,455.30 SLE
SLE to MRO
SLE MRO
1 SLE 15.49 MRO
10 SLE 154.91 MRO
100 SLE 1,549.11 MRO
1,000 SLE 15,491.14 MRO
10,000 SLE 154,911.41 MRO
50,000 SLE 774,557.06 MRO
100,000 SLE 1,549,114.12 MRO

Get MRO→SLE rates via API

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

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Questions about MRO to SLE

How much is 10 MRO in SLE?

10 old Mauritanian ouguiyas is 0.6455 Sierra Leonean leones at the mid-market rate of 4 October 2026, 11:41 UTC, when 1 MRO = 0.064553 SLE.

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

Over the last 52 weeks 1 MRO ranged from 0.0634455 to 0.069048 SLE, 0.064353 SLE on average.

Which exchange rate is this?

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