FinToolSuite

Yield Comparison Calculator

Updated April 20, 2026 · Investing · Educational use only ·

Compare the annual income from three different yields on the same principal.

Compare yields across three investments on the same principal. See which pays the most income per year and the gap between them.

What this tool does

Enter a principal amount and up to three annual yields (savings rate, dividend yield, bond coupon — whatever you're comparing). The tool returns the annual income each yield produces, identifies the highest, and shows the annual gap between the best and worst. Use it to sanity-check whether a higher-yield product is meaningfully better or just marginally so.


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Formula Used
Amount invested
Annual yield as a decimal

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Disclaimer

Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.

On 10,000 of principal, a 5% yield pays 500 a year; a 3% yield pays 300. The 2-point spread is 200 of income — worth chasing if it's truly low-risk, less so if the higher yield comes with more volatility or a lock-up period.

What the result means

The primary result is the highest annual income. The secondary rows show each yield's income and the gap between the top and bottom. A small gap on a big principal can still be worth chasing; a large gap on a small principal often isn't worth the switching effort.

What this tool doesn't capture

Risk, liquidity, tax treatment, and lock-up periods. A 5% yield with a 5-year lock is not directly comparable to a 4% easy-access rate. Use the yield gap as a starting point, not the final decision.

A worked example

Try the defaults: principal of 10,000, yield a of 3%, yield b of 4.5%, yield c of 5.2%. The tool returns 520.00. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.

What moves the number most

The result responds to Principal, Yield A, Yield B, and Yield C. Two inputs usually tip the answer one way or the other. Identify which ones matter most by flipping each value past a round threshold and watching whether the winning option changes.

The formula behind this

Annual income equals principal multiplied by the yield as a decimal. The tool ranks the three yields and shows the spread. Ignores compounding frequency — quoted yields are treated as simple annual rates. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.

Where this fits in planning

This is a "what-if" tool, not a forecast. Use it to test ideas before committing: what happens if the rate is 2% lower than hoped, what happens if you add five more years. The value is in the scenarios you run, not the single answer you get from the defaults.

Example Scenario

The highest yield pays the figure shown above in annual income on your principal.

Inputs

Principal:£10,000
Yield A:3
Yield B:4.5
Yield C:5.2
Expected Result£520.00

This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.

Sources & Methodology

Methodology

Annual income equals principal multiplied by the yield as a decimal. The tool ranks the three yields and shows the spread. Ignores compounding frequency — quoted yields are treated as simple annual rates.

Frequently Asked Questions

Does this account for tax?
No. If one option is wrapped (tax-advantaged savings account, pension) and another isn't, adjust the yields to their after-tax equivalents before comparing.
Does it compound?
No — it shows one year of simple income. If you're reinvesting yields, the compounded gap over many years is larger than the single-year difference shown here.
What about risk?
Yield alone is not the full picture. A 6% corporate bond yield carries more default risk than a 4% government bond. Treat the yield gap as a starting point, not the answer.
Can I compare rental yield to savings?
Yes, but use net rental yield (after costs) for a fair comparison, and remember property is illiquid and management-intensive.

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