Manual mode works from ESOP value per share backwards to the implied company sale price. Company sale mode works from company sale price forwards to ESOP value per share.
This is a rough planning calculator. It assumes your ESOP payout is taxed as employment income, and that tax is applied to the gain after deducting the strike price. It does not account for social security, deductions, exact German tax-band effects, timing rules, liquidation preferences, investor preference stacks, dilution, transaction costs, or individual tax advice.