Bond Calculator UK
Calculate the price, current yield, and total return of a UK bond or gilt instantly. Enter the bond’s details below for a clear, worked breakdown of the valuation maths.
Bond Details
Enter the bond’s terms to calculate its price and yield
The amount repaid to the holder at maturity.
The fixed annual interest rate paid on the face value.
Most UK gilts pay coupons semi-annually.
Number of years remaining until the bond matures.
The prevailing annual yield for bonds of similar risk and maturity.
Valuation Results
Bond price, yield, and income breakdown
Enter your bond’s terms above, then click Calculate Bond Price to see its estimated value and yield.
How Bond Pricing Works
A bond’s fair price is the present value of every future cash flow it pays, its regular coupons plus the face value returned at maturity, discounted back at the prevailing market yield.
Where C is the coupon per period, r is the market yield per period, n is the number of periods, and F is the face value.
A simple measure of income return based on the bond’s current market price rather than its face value.
How Coupon Rate vs Yield Affects Price
A quick-glance table showing how a bond’s price moves relative to its £1,000 face value depending on how its coupon rate compares to the market yield (10-year bond, semi-annual coupons).
| Coupon Rate | Market Yield | Approx. Price vs Par |
|---|---|---|
| 3% | 5% | Discount (below £1,000) |
| 5% | 5% | Par (£1,000) |
| 7% | 5% | Premium (above £1,000) |
| 4% | 4% | Par (£1,000) |
| 2% | 4.5% | Discount (below £1,000) |
| 6% | 3.5% | Premium (above £1,000) |
UK Bond Calculator FAQ
Everything you need to know about calculating and understanding UK bond prices and yields.
A bond’s price is the present value of all its future coupon payments plus the present value of its face value repaid at maturity, discounted at the prevailing market yield. When the market yield is higher than the coupon rate, the bond trades at a discount; when lower, it trades at a premium.
The coupon rate is the fixed annual interest paid as a percentage of face value. Current yield is the annual coupon divided by the bond’s current market price. Yield to maturity (YTM) is the total return an investor earns if the bond is held until maturity, accounting for price, coupons, and time.
UK government bonds, known as gilts, typically pay coupons semi-annually, meaning investors receive two interest payments per year. Most UK corporate bonds also pay semi-annually, though some pay annually or quarterly depending on the issuer.
A bond trades at a premium when its market price is above its face value, which happens when its coupon rate exceeds prevailing market yields. It trades at a discount when its price is below face value, typically because its coupon rate is lower than current market yields.
In the UK, interest from most bonds, including gilts and corporate bonds, is generally subject to Income Tax, though gilts held directly are exempt from Capital Gains Tax. Bonds held within an ISA or SIPP are typically sheltered from tax. Rules can be complex, so it’s worth checking current HMRC guidance or speaking with a tax adviser for your specific situation.