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Old Sierra Leonean Leone (SLL) to Mongolian Tugrik (MNT)

Convert old Sierra Leonean leones to Mongolian Tugrik at the live mid-market rate. Reverse: MNT 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 MNT.

1 Old Sierra Leonean Leone =

0.1565 MNT 0.00% today

1 SLL = 0.15645 MNT · 1 MNT = 6.39181 SLL

Mid-market rate, updated 11:30 UTC. Paid plans update as often as every 60 seconds. Get SLL→MNT rates via API

SLL to MNT over the last year

0.1560.158Nov ’25Jan ’26Mar ’26May ’26Jul ’26Sep ’26
52-week high
0.15909
52-week low
0.15443
52-week average
0.15692
Change over the year
−1.32%

Conversion tables

SLL to MNT
SLL MNT
1 SLL 0.1565 MNT
10 SLL 1.56 MNT
100 SLL 15.65 MNT
1,000 SLL 156.45 MNT
10,000 SLL 1,564.50 MNT
50,000 SLL 7,822.51 MNT
100,000 SLL 15,645.03 MNT
MNT to SLL
MNT SLL
1 MNT 6.39 SLL
10 MNT 63.92 SLL
100 MNT 639.18 SLL
1,000 MNT 6,391.81 SLL
10,000 MNT 63,918.07 SLL
50,000 MNT 319,590.36 SLL
100,000 MNT 639,180.73 SLL

Get SLL→MNT rates via API

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

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Questions about SLL to MNT

How much is 1 SLL in MNT?

1 Old Sierra Leonean Leone is 0.15645 Mongolian Tugrik at the mid-market rate of 4 October 2026, 11:30 UTC, and 1 MNT is 6.39181 SLL.

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

Over the last 52 weeks 1 SLL ranged from 0.154429 to 0.159092 MNT, 0.156923 MNT on average.

Which exchange rate is this?

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