Savings Ladder Income Calculator
Annual interest from a 5-rung fixed-term savings ladder with user-entered values and rates.
Calculate annual interest from a savings ladder calculator across 5 fixed-term rungs with custom amounts, rates, and weighted average return.
What this tool does
A savings ladder spreads cash across five fixed-term accounts maturing in staggered years, combining access to funds with predictable interest rates. You enter the amount and rate for each rung. The calculator then computes three outputs: total annual interest earned across all rungs, the weighted average rate reflecting your blended return, and your total capital deployed. The result shows what interest income the ladder generates each year based on your entered values, helping you model how different allocation and rate combinations affect overall returns. The calculation assumes simple annual interest; it does not account for reinvestment, tax, inflation, or changes to rates after initial deposit. This tool is for illustration only and reflects your inputs at a single point in time.
Enter Values
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Formula Used
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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.
10,000 in each of 5 rungs at 4%, 4.3%, 4.5%, 4.7%, 4.8% earns 2,230 a year — a 4.46% weighted rate. Each year one rung matures, freeing 10,000 for spending or reinvestment at current rates. Ladders balance yield (longer fixes pay more) with liquidity (something matures each year).
Rolling the ladder
When rung 1 matures, reinvest at the longest term (5 years) to maintain the 5-year structure. This keeps always-one-year-away liquidity while maximising yield — the hallmark of a ladder strategy.
Quick example
With rung 1 amount of 10,000 and rung 1 rate of 4% (plus rung 2 amount of 10,000 and rung 2 rate of 4.3%), the result is 2,230.00. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.
Which inputs matter most
You enter Rung 1 Amount, Rung 1 Rate, Rung 2 Amount, Rung 2 Rate, and Rung 3 Amount. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
What's happening under the hood
Total interest is the sum of each rung's amount times rate. Weighted average rate is total interest divided by total capital. Assumes simple annual interest payout; compound accumulation is identical over single-year horizons. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.
Turning the result into a plan
A projection is just a starting point. The real work is setting the monthly amount aside automatically so the saving happens before you can spend it. Most people who hit savings goals set up a standing order on payday; most who miss them rely on willpower at month-end.
What this doesn't capture
The calculation assumes a steady savings rate and a stable interest rate. Real saving journeys include emergencies, windfalls, and rate changes — especially in easy-access products. The figure is a direction of travel, not a guarantee.
A savings ladder with £10,000 at 4 through £10,000 at 4.8 generates 2,230.00 in annual interest.
Inputs
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
The calculator computes total annual interest by multiplying each rung's deposit amount by its corresponding interest rate, then summing across all five rungs. It derives a weighted average rate by dividing total interest by the combined capital across all rungs. The model assumes simple annual interest, where interest is calculated once per year on the original principal without compounding within that year. Over a single-year horizon, simple and compound interest produce equivalent results. The calculator does not model fees, tax deductions, or changes to rates or balances after the initial setup. Results represent interest accrued within one annual period only.
Frequently Asked Questions
Why a ladder vs single fix?
What terms are typical?
Is this inflation-protected?
What about ISAs?
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