Pricing difference
Mutual funds are usually transacted at NAV, while ETFs trade on exchanges during market hours. ETF prices can trade at a premium or discount to NAV.
Cost difference
Both can have expense ratios, but ETFs also involve bid-ask spreads and brokerage. Mutual funds may have exit loads or regular-vs-direct plan differences.
Which calculators help
Use ETF cost calculators for spreads and expenses, and mutual fund calculators for SIP, SWP, XIRR, expense ratio, and tax planning.