Convert 1 Old Sierra Leonean Leone (SLL) to Old São Tomé Dobra (STD)

Convert old Sierra Leonean leones to old São Tomé dobras at the live mid-market rate. Reverse: STD 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 STD.

The Old São Tomé Dobra is no longer in use

Old São Tomé Dobra (STD) was replaced by the São Tomé and Príncipe Dobra (STN) in 2018. For today’s money, convert SLL to STN.

Amount

From

1 Old Sierra Leonean Leone =

0.9489 STD −0.67% today

1 SLL = 0.948939 STD · 1 STD = 1.05381 SLL

Mid-market rate, updated 11:38 UTC. Paid plans update as often as every 60 seconds. Get SLL→STD rates via API

SLL to STD over the last year

52-week high: 0.95837
52-week low: 0.90407
52-week average: 0.93237
Change over the year: +2.68%

Conversion tables

SLL to STD
SLL	STD
1 SLL	0.9489 STD
10 SLL	9.49 STD
100 SLL	94.89 STD
1,000 SLL	948.94 STD
10,000 SLL	9,489.39 STD
50,000 SLL	47,446.93 STD
100,000 SLL	94,893.87 STD

STD to SLL
STD	SLL
1 STD	1.05 SLL
10 STD	10.54 SLL
100 STD	105.38 SLL
1,000 STD	1,053.81 SLL
10,000 STD	10,538.09 SLL
50,000 STD	52,690.44 SLL
100,000 STD	105,380.89 SLL

Get SLL→STD rates via API

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

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Questions about SLL to STD

How much is 1 SLL in STD?

1 Old Sierra Leonean Leone is 0.9489 old São Tomé dobras at the mid-market rate of 4 October 2026, 11:38 UTC, when 1 SLL = 0.948939 STD.

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

Over the last 52 weeks 1 SLL ranged from 0.904068 to 0.958367 STD, 0.932368 STD on average.

Which exchange rate is this?

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