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

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

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 OP to MRU.

Amount

From

1 Optimism =

47.78 MRO −2.01% today

1 OP = 47.781 MRO · 1 MRO = 0.0209288 OP

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

OP to MRO over the last year

52-week high: 270.492
52-week low: 29.334
52-week average: 71.187
Change over the year: −81.51%

Conversion tables

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

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

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

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Questions about OP to MRO

How much is 1 OP in MRO?

1 Optimism is 47.78 old Mauritanian ouguiyas at the mid-market rate of 4 October 2026, 08:59 UTC, when 1 OP = 47.781 MRO.

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

Over the last 52 weeks 1 OP ranged from 29.3335 to 270.492 MRO, 71.1871 MRO on average.

Which exchange rate is this?

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