Meaning and calculation
ROI = (final value − initial investment) ÷ initial investment × 100%. When the final value is twice the initial investment, ROI is exactly 100%.
So a 100% ROI simply means: the money you made equals the money you put in.
Formulas
(final value − initial investment) ÷ initial investment × 100%initial investment × ROIfinal value = initial investment × 2Worked example (recompute it yourself)
Fees excluded: invest 1,000 USDT, end at 2,000 USDT, profit = 1,000 USDT, ROI = (2,000 − 1,000) ÷ 1,000 × 100% = 100%.
With a 0.1% fee on both sides: buy at 30,000 and sell at a doubled 60,000. Coins = 1,000 × 0.999 ÷ 30,000 = 0.0333, gross proceeds = 0.0333 × 60,000 = 1,998 USDT, and net proceeds after the sell fee = 1,996.002 USDT.
Now ROI = (1,996.002 − 1,000) ÷ 1,000 × 100% ≈ 99.60%, which is 0.40 points below 100% — a doubled price does not give a 100% account ROI.
Notes
ROI is the cumulative return over the whole holding period and ignores duration. Doubling in one year and doubling in five years annualise very differently.
To compare across holding periods, use CAGR = (final value ÷ initial investment)^(1 ÷ years) − 1.
FAQ
Is a 100% ROI a double?
Yes. When net profit equals the initial investment, the final value is twice the initial investment — the capital doubled.
Why is it below 100% once fees are included?
Fees cut the coins received on the buy and the cash received on the sell, so a 100% price rise gives a return slightly below 100% — 99.60% in the example.
What is a 100% ROI annualised over two years?
Over one year it is 100%; over two years CAGR = 2^(1÷2) − 1 ≈ 41.42%.