Convert 1 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.

Amount

From

1 Old Mauritanian Ouguiya =

0.01387 ARB −0.08% today

1 MRO = 0.0138656 ARB · 1 ARB = 72.1207 MRO

Mid-market rate, updated 10:09 UTC. Paid plans update as often as every 60 seconds. Get MRO→ARB rates via API

MRO to ARB over the last year

52-week high: 0.038253
52-week low: 0.006135
52-week average: 0.022325
Change over the year: +114.92%

Conversion tables

MRO to ARB
MRO	ARB
1 MRO	0.01387 ARB
10 MRO	0.1387 ARB
100 MRO	1.38656421 ARB
1,000 MRO	13.86564210 ARB
10,000 MRO	138.65642100 ARB
50,000 MRO	693.28210500 ARB
100,000 MRO	1,386.56421000 ARB

ARB to MRO
ARB	MRO
1 ARB	72.12 MRO
10 ARB	721.21 MRO
100 ARB	7,212.07 MRO
1,000 ARB	72,120.71 MRO
10,000 ARB	721,207.13 MRO
50,000 ARB	3,606,035.67 MRO
100,000 ARB	7,212,071.33 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 0.01387 Arbitrums at the mid-market rate of 4 October 2026, 10:09 UTC, when 1 MRO = 0.0138656 ARB.

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, 0.0223253 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.