Crypto DCA Calculator
Rupee-cost averaging means buying a fixed amount at regular intervals, whatever the price. This shows the coins you would accumulate, your average buy price, and how it compares with investing everything at the start.
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How to use this calculator
- Enter amount per purchase
- Enter number of purchases — For example 24 monthly buys over two years.
- Enter price at the first purchase
- Enter price now — You supply both prices — no live rates are used.
- Enter period covered — Used to annualise the return.
- Read the result — it updates as you type.
The formula used
Coins = Σ (Amount ÷ Price at each buy) · Average cost = Total invested ÷ Total coins
- Amount
- The fixed sum you invest each time
- Price
- The price at each purchase
The key property of rupee-cost averaging: a fixed amount buys more coins when the price is low and fewer when it is high. That makes your average cost lower than the simple average of the prices — a mathematical certainty whenever prices vary.
The assumption in this calculator: real prices jump around, and we cannot know what they were on each of your buying dates. So the price path is modelled as a smooth geometric move from your starting price to your ending price. Real averaging into a volatile asset usually produces a slightly better average cost than this smooth model suggests.
Worked example
₹10,000 invested 24 times, with the price moving from ₹25,00,000 to ₹42,00,000.
- Total invested₹10,000 × 24 = ₹2,40,000
- Price pathsmoothly from ₹25L to ₹42L
- Early buys get more coins per rupee; later buys get fewer
- Coins accumulated ≈ 0.07497
- Value today = 0.07497 × ₹42,00,000 ≈ ₹3,14,881
The average purchase price lands below the midpoint of the two prices — that is rupee-cost averaging doing its job.
Why averaging in suits volatile assets
Dollar-cost averaging — rupee-cost averaging here — means committing to buy a fixed amount on a schedule and ignoring the price. It is the same idea as a SIP, applied to a far more volatile asset.
The mathematical advantage
Because a fixed rupee amount buys more units at low prices, your average cost is always below the average of the prices you paid at. The more the price swings, the bigger that effect.
The behavioural advantage, which matters more
Crypto's biggest falls are exactly when people stop buying, and its biggest rises are when they pile in. A fixed schedule removes that decision entirely.
What it does not do
Averaging does not make a bad asset good, and it does not protect you from a permanent decline. If the price never recovers, you have simply bought more of something that kept falling. Size the total commitment to what you can genuinely afford to lose.
Tips and common mistakes
Getting more out of it
- Weekly and monthly buying give very similar results — monthly usually costs less in fees.
- Decide the total you are prepared to commit before starting, and treat it as money you could lose.
Mistakes to avoid
- Reading the smooth price path as a forecast. It is a neutral assumption, not history.
- Believing averaging protects against a permanent decline. It only helps if the price recovers.
- Stopping the schedule during a fall, which removes the main benefit of averaging in the first place.
Frequently asked questions
What is DCA?
Dollar-cost averaging: investing a fixed amount at regular intervals regardless of price, instead of trying to pick the right moment. In India it is the same idea as a SIP.
Does this use real historical prices?
No. It models a smooth price path between the two prices you enter. Real volatility usually improves the average cost slightly compared with this model.
Is DCA better than investing a lump sum?
In a steadily rising market, no — investing earlier wins. In a volatile or falling market, averaging generally does better and is far easier to stick with.
How often should I buy?
Weekly and monthly give very similar results. Monthly is usually more practical and incurs fewer fees.
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