The FTSE 100 has loved a strong run in 2025 to date, with investor sentiment buoyed by easing inflation and the prospect of decrease rates of interest. However regardless of the broader rally, there are nonetheless pockets of worth hiding in plain sight. Some shares proceed to commerce on modest valuations, whilst their financials and share costs present indicators of restoration.

By specializing in basic valuation metrics just like the price-to-earnings (P/E) ratio, price-to-sales (P/S) ratio, and price-to-earnings progress (PEG) ratio, traders can establish high quality firms buying and selling beneath their perceived price. 

Listed below are two low cost FTSE 100 shares that I consider traders ought to take into account as we head into the second half of 2025.

BT Group

Because the UK’s largest telecommunications agency, BT Group (LSE: BT.A) wants no introduction. It’s supplied analogue and digital communication providers throughout the nation for nearly 180 years. After an extended interval of underperformance, the shares have staged a comeback in 2025, rising 34% this yr to round 190p, bringing the corporate’s market-cap to £18.78bn.

But regardless of the rally, the shares nonetheless look cheap. The P/E ratio stands at 17.9, whereas the PEG ratio’s simply 0.7, suggesting that earnings progress could also be underappreciated by the market. In the meantime, a P/S ratio of 0.94 implies that traders are paying lower than £1 for each £1 of income — an encouraging signal for worth seekers.

BT’s additionally proving enticing for earnings traders, with a dividend yield of 4.2% and a sustainable payout ratio of 75.7%. Operationally, the corporate’s on strong floor, posting an working margin of 16.3% and a return on fairness (ROE) of 8.3%.

Nonetheless, traders shouldn’t ignore the dangers. Its debt-to-equity (D/E) ratio’s a excessive 1.81, which leaves BT uncovered to rising financing prices. There are additionally challenges from regulatory price controls and the large capital expenditure required for full-fibre broadband rollouts. These components might restrict how a lot shareholder worth it might return within the close to time period.

Nonetheless, for worth traders, I really feel it’s probably the most promising-looking shares on the Footsie proper now.

Centrica

Centrica (LSE: CNA), the mum or dad firm of British Fuel, operates in power provide, buying and selling and storage. Shares have risen 13% in 2025, presently buying and selling at 165p, with a market-cap of £7.8bn. In contrast to many friends, Centrica has emerged from the power disaster with leaner operations and a sharper give attention to profitability.

Valuation-wise, the inventory seems undeniably low cost. The P/E ratio’s simply 6.67, the P/S ratio’s 0.42, and the price-to-free money stream ratio stands at 7.37. These figures counsel the market has but to totally price in Centrica’s improved fundamentals.

It additionally boasts a wonderful working margin of 28.3% and an outstanding ROE of 32.1%. The dividend yield’s modest at 2.7% however the payout ratio’s simply 17.8%, leaving important room for future will increase. Debt’s additionally nicely below management, with a D/E ratio of 0.78.

As at all times, dangers stay. Centrica’s uncovered to risky power markets, political scrutiny over pricing and the transition to renewable power, which can require large-scale funding within the years forward.

General, I feel each shares are presently undervalued, with probability of ending this yr larger.