Convert 1 Old Mauritanian Ouguiya (MRO) to Optimism (OP)

Convert old Mauritanian ouguiyas to Optimism at the live mid-market rate. Reverse: OP 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 OP.

Amount

From

1 Old Mauritanian Ouguiya =

0.02093 OP +2.05% today

1 MRO = 0.0209288 OP · 1 OP = 47.781 MRO

Mid-market rate, updated 08:59 UTC. Paid plans update as often as every 60 seconds. Get MRO→OP rates via API

MRO to OP over the last year

52-week high: 0.034091
52-week low: 0.003697
52-week average: 0.019286
Change over the year: +440.97%

Conversion tables

MRO to OP
MRO	OP
1 MRO	0.02093 OP
10 MRO	0.2093 OP
100 MRO	2.09288299 OP
1,000 MRO	20.92882990 OP
10,000 MRO	209.28829900 OP
50,000 MRO	1,046.44149500 OP
100,000 MRO	2,092.88299000 OP

OP to MRO
OP	MRO
1 OP	47.78 MRO
10 OP	477.81 MRO
100 OP	4,778.10 MRO
1,000 OP	47,780.98 MRO
10,000 OP	477,809.80 MRO
50,000 OP	2,389,048.99 MRO
100,000 OP	4,778,097.99 MRO

Get MRO→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=MRO -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=MRO -d currencies=OP \
  -d date=2025-10-04 \
  -H "apikey: YOUR-API-KEY"

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Questions about MRO to OP

How much is 1 MRO in OP?

1 Old Mauritanian Ouguiya is 0.02093 Optimism at the mid-market rate of 4 October 2026, 08:59 UTC, when 1 MRO = 0.0209288 OP.

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

Over the last 52 weeks 1 MRO ranged from 0.00369697 to 0.0340907 OP, 0.0192856 OP on average.

Which exchange rate is this?

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