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Old Mauritanian Ouguiya (MRO) to Arbitrum (ARB)

Convert old Mauritanian ouguiyas to Arbitrums at the live mid-market rate. Reverse: ARB 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 ARB.

1 Old Mauritanian Ouguiya =

0.01377 ARB −0.75% today

1 MRO = 0.0137721 ARB · 1 ARB = 72.6106 MRO

Mid-market rate, updated 05:00 UTC. Paid plans update as often as every 60 seconds. Get MRO→ARB rates via API

MRO to ARB over the last year

0.010.020.030.04Nov ’25Jan ’26Mar ’26May ’26Jul ’26Sep ’26
52-week high
0.038253
52-week low
0.006135
52-week average
0.022325
Change over the year
+113.47%

Conversion tables

MRO to ARB
MRO ARB
1 MRO 0.01377 ARB
10 MRO 0.1377 ARB
100 MRO 1.37720857 ARB
1,000 MRO 13.77208570 ARB
10,000 MRO 137.72085700 ARB
50,000 MRO 688.60428500 ARB
100,000 MRO 1,377.20857000 ARB
ARB to MRO
ARB MRO
1 ARB 72.61 MRO
10 ARB 726.11 MRO
100 ARB 7,261.06 MRO
1,000 ARB 72,610.64 MRO
10,000 ARB 726,106.43 MRO
50,000 ARB 3,630,532.15 MRO
100,000 ARB 7,261,064.30 MRO

Get MRO→ARB rates via API

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

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Questions about MRO to ARB

How much is 1 MRO in ARB?

1 Old Mauritanian Ouguiya is 0.0137721 Arbitrums at the mid-market rate of 4 October 2026, 05:00 UTC, and 1 ARB is 72.6106 MRO.

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

Over the last 52 weeks 1 MRO ranged from 0.00613512 to 0.0382532 ARB, 0.0223251 ARB on average.

Which exchange rate is this?

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