It may feel worthwhile when
You value clearing the mortgage sooner, you already have a cash buffer, and the projected interest saving feels meaningful enough to justify the extra payment.
Overpaying can be worthwhile, but the real value depends on how much interest it saves and what flexibility you give up.
Direct answer
Overpaying is often worth considering if you want to reduce interest and become mortgage-free sooner. It may be less attractive if you need easier access to cash, face overpayment charges, or would feel stretched by giving up extra savings.
People often judge the decision by a mix of savings and peace of mind.
You value clearing the mortgage sooner, you already have a cash buffer, and the projected interest saving feels meaningful enough to justify the extra payment.
Your budget is tight, you may need the money soon, or your mortgage terms mean a charge could apply if you overpay too aggressively.
Use the mortgage overpayment calculator and compare the savings with the flexibility you would lose.
Some of the benefit can disappear if you breach a limit or ignore an early repayment charge, so checking the terms still matters.
Use one page for the principle and another for the numbers.
A useful estimate is still only part of the picture.
Whether overpaying feels worth it is personal as well as mathematical. Use the projected savings as a guide, then compare them with your need for flexibility and your own mortgage terms.
Enter your figures and compare the projected time saved and interest saved against the trade-off in flexibility.