Savings Rate Calculator
The share of income you keep, and how long that rate takes to buy financial independence.
The savings rate is the single number that decides how long a working life has to last. Saving a tenth of income takes decades to reach independence, and saving half of it takes years, because both the amount saved and the spending that has to be covered move at the same time.
Enter income, what is put aside and what is spent, and this calculator gives the rate, the annual amount, the number the 25 times rule produces and how far away it is at this pace.
At a glance
- What you enter
- Monthly income after tax, Saved each month, Spent each month, Already saved, Expected return, Years to project
- What you get
- Savings rate, Saved each year, Years to cover your spending, Amount needed to cover spending, Savings at the end of the period, Years of spending already covered
- Formula shown
- Yes - every step, right below your results.
- Cost and privacy
- Free, no account needed, and nothing you type is stored.
See worked examples ↓ Read the FAQ ↓ Share this calculator ↓
Results are estimates for general information only - always verify with a professional or official source before acting on them.
How to use the Savings Rate Calculator
- 1 Enter Monthly income after tax
- 2 Enter Saved each month - Everything that is not spent: transfers to savings, investments and pension contributions you make yourself.
- 3 Enter Spent each month - Income minus savings, unless something else is going on.
- 4 Enter Already saved
- 5 Enter Expected return (percent a year)
- 6 Enter Years to project (years)
- 7 Press Calculate. You get Savings rate, Saved each year, Years to cover your spending, Amount needed to cover spending, Savings at the end of the period, Years of spending already covered, and every intermediate step stays visible under “How is this calculated?”
- 8 Change one number at a time to see what moves the result - that is usually the most useful thing a calculator can tell you.
Worked examples
Real numbers run through this calculator. Open any example to load it into the form above and change it.
Saving 600 a month on 4,000 of income
A rate that beats the average and still leaves a long way to go.
You enter
- Monthly income after tax
- $4,000.00
- Saved each month
- $600.00
- Spent each month
- $3,400.00
- Already saved
- $25,000.00
- Expected return
- 5%
- Years to project
- 10 years
You get
- Savings rate
- 15.0%
- Saved each year
- $7,200.00
- Years to cover your spending
- 38.67 years
- Amount needed to cover spending
- $1,020,000.00
- Savings at the end of the period
- $134,344.61
- Years of spending already covered
- 0.61 years
The rate is 15.0 percent, or 7,200 a year. Spending of 40,800 a year needs 1,020,000 to cover at the 25 times rule, and at this pace that is 38.67 years away. The 25,000 already saved covers 0.61 years of spending and reaches 134,344.61 in ten years at 5 percent.
Saving 2,500 a month on 6,000 of income
A high rate, where the same target moves from decades to years.
You enter
- Monthly income after tax
- $6,000.00
- Saved each month
- $2,500.00
- Spent each month
- $3,500.00
- Already saved
- $60,000.00
- Expected return
- 6%
- Years to project
- 15 years
You get
- Savings rate
- 41.7%
- Saved each year
- $30,000.00
- Years to cover your spending
- 17.01 years
- Amount needed to cover spending
- $1,050,000.00
- Savings at the end of the period
- $874,292.39
- Years of spending already covered
- 1.43 years
A rate of 41.7 percent, or 30,000 a year. The target is 1,050,000 because the spending is similar, and this time it is 17.01 years away rather than 38.67. The savings reach 874,292.39 after fifteen years at 6 percent, and the 60,000 already there covers 1.43 years of spending.
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Frequently asked questions
Is the savings rate calculated on gross or net income?
On the income that reaches the account, so after tax and any other deduction taken at source. Using gross income would understate the rate and make it incomparable with a household in a different tax position.
Pension contributions taken from a salary before tax are a complication. They are saving, and they never appear in take-home pay, so the honest approach is to add them back to income and to savings together, which leaves the rate unchanged.
Does paying down a mortgage count as saving?
The capital part does, and the interest part does not, which is why a mortgage is awkward to place in a savings rate. Repaying capital raises your net worth exactly as a transfer to a savings account does, while the interest is a cost like rent.
If a large part of your monthly surplus goes into mortgage capital, the savings rate here will understate what you are actually building. The net worth calculator is the better page for that position.
Why does the time to independence move so much with the rate?
Because the savings rate affects both sides of the equation at once. Saving more reduces the spending that has to be covered, which lowers the target, and it increases the amount added to it every month. Going from 10 percent to 20 percent does not halve the time, it cuts it by far more than half.
That is the whole argument behind the idea that the savings rate matters more than the return. The return is worth having, and it is a smaller lever than the rate at which money is added.
What is the 25 times rule and can I rely on it?
It is the inverse of withdrawing 4 percent a year, so a pot of 25 times annual spending supports that spending indefinitely under the historical conditions the rule was tested on. It comes from studying thirty year periods in a single market, which is a narrow base.
Long retirements, high fees and a bad first decade all argue for a larger multiple, and 30 times is a common alternative. The calculator uses 25 because it is the standard reference point, not because it is a promise.