Understanding SIP Investment Calculators: A Query

I'm seeking clarification on SIP (Systematic Investment Plan) investment calculators and their functionality. While I've utilized several online calculators to project potential returns on SIP investments, I've encountered discrepancies in results across different platforms of Sip investment calculator. Specifically, I'm puzzled by the variation in projected returns despite inputting the same parameters. Could someone shed light on the factors influencing these variations? Additionally, any recommendations for reliable SIP calculators or insights on refining calculations for more accurate projections would be greatly appreciated. Thank you in advance for your assistance.

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