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

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

Amount

From

100 old Sierra Leonean leones =

1.55 MRO 0.00% today

1 SLL = 0.0155323 MRO · 1 MRO = 64.3821 SLL

Mid-market rate, updated 10:00 UTC. Paid plans update as often as every 60 seconds. Get SLL→MRO rates via API

SLL to MRO over the last year

52-week high: 0.015804
52-week low: 0.015521
52-week average: 0.015654
Change over the year: −1.36%

Conversion tables

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

MRO to SLL
MRO	SLL
1 MRO	64.38 SLL
10 MRO	643.82 SLL
100 MRO	6,438.21 SLL
1,000 MRO	64,382.11 SLL
10,000 MRO	643,821.14 SLL
50,000 MRO	3,219,105.69 SLL
100,000 MRO	6,438,211.38 SLL

Get SLL→MRO rates via API

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

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Questions about SLL to MRO

How much is 100 SLL in MRO?

100 old Sierra Leonean leones is 1.55 old Mauritanian ouguiyas at the mid-market rate of 4 October 2026, 10:00 UTC, when 1 SLL = 0.0155323 MRO.

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

Over the last 52 weeks 1 SLL ranged from 0.0155209 to 0.0158042 MRO, 0.0156541 MRO on average.

Which exchange rate is this?

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