Percent Growth Calculator
Percent growth answers one clean question: by what percentage did a value change between a starting point and an ending point? Enter the two values and this calculator returns the growth amount, the percentage, a plain reading of growth, decline, or no change, and the three arithmetic steps in between, so the number can be checked rather than trusted.
The second tab answers the follow-up question. If that same pace continued, what would the value become? Projection mode compounds a rate forward period by period and prints every step, up to 30 periods. Everything on this page is built around those two jobs: measuring a change that already happened, and projecting one rate forward.
Reset clears the fields in the mode you are using. Percent growth needs a positive starting value to read cleanly: the formula divides by the starting value as entered, so a negative baseline flips the sign of the percentage (see the last FAQ).
Quick Answer
Key takeaways
- Percent growth is the change divided by the starting value, times 100. The starting value is always the denominator, which is why the same move gives a different percentage in each direction.
- A positive result is growth, a negative result is decline, and 0.00% is no change. The tool shows the growth amount next to the percentage, because both numbers matter.
- Percent growth cannot be calculated from a starting value of zero. Report the absolute amount instead.
- Projection mode is not a forecast. It compounds one fixed rate exactly, period after period, so it shows what a pace implies, not what will happen.
Percent growth, or an annual growth rate?
This page measures the total change between two values, with no annualizing and no year-by-year breakdown. If your question includes the words per year, the tool you want is different, and using this page for that job is the most common way percent growth gets misquoted.
When you need the total change annualized, the year-by-year pattern, or all three measures side by side, use our growth rate calculator: it runs total growth, CAGR, and AAGR modes in one place, with a doubling time and a per-year table. The two pages are kept separate on purpose. This one is the narrow tool for a single change between two values plus a forward projection; that one exists for annualized and average yearly rates. For an investment framing of the annualized rate itself, our CAGR return calculator presents the same compound math as a return, and for a plain one-step percentage change in a price or quantity with no growth story attached, our change percent calculator covers that narrower wording.
A useful rule: two values and one interval belong here. Two values, an interval, and a number of years belong on the growth rate page. Mixing the two up turns a 30% gain over five years into a false 30% per year.
The formula and the three steps
The formula is one line, and the calculator prints its three steps with your numbers filled in every time it runs. Nothing is hidden behind the percentage.
Projection, per period = Current Value x (1 + Rate / 100), repeated for each period
Three input behaviours are worth knowing before you trust a result. First, a blank or non-numeric ending value is read as 0, so clearing the ending field and pressing Calculate growth returns -100.00% rather than an error; only the starting value is guarded, and a starting value of zero, blank, or non-numeric stops the calculation with an explanation. Second, both values must share the same units and the same definition, or the percentage compares unlike things. Third, if you are working the division step by hand and want to check the decimal as a percentage, our fraction to percent calculator handles that single conversion.
Worked examples for both modes
Every number in this section reproduces exactly in the calculator above, which opens pre-filled with the first example. Run them in order to see the growth steps and the projection table the tool prints.
Growth mode. A small business earned 50,000 last year and 65,000 this year. Step 1: 65,000 - 50,000 = 15,000. Step 2: 15,000 / 50,000 = 0.3000. Step 3: 0.3000 x 100 = 30.00%, labelled Growth. The method is the same one the Indeed guide to calculating growth percentage sets out for workplace figures, and the revenue version is what accounting guides such as the Motley Fool revenue growth walkthrough apply period over period.
A decline reads the other way. The same business falling from 50,000 to 40,000 gives a growth amount of -10,000.00 and -20.00%, labelled Decline. A fall to exactly zero is -100.00%. Note the asymmetry the table below makes concrete: losing 20% and then gaining 20% does not bring you back, because the second percentage is measured against the smaller value.
| Move | Growth amount | Percent growth | Reading |
|---|---|---|---|
| 50,000 to 65,000 | 15,000.00 | 30.00% | Growth |
| 50,000 to 40,000 | -10,000.00 | -20.00% | Decline |
| 100 to 80 | -20.00 | -20.00% | Decline |
| 80 to 100 (the way back) | 20.00 | 25.00% | Growth |
| 5,000 to 5,000 | 0.00 | 0.00% | No change |
Projection mode. Start where the growth example ends: a current value of 65,000 growing at 30% per period. Each period multiplies by 1.30, so the table runs 84,500.00, 109,850.00, and 142,805.00 after three periods. A flat rate of 0% returns the starting value in every row, and a negative rate projects a decline: 10,000 at -10% per period runs 9,000.00, then 8,100.00. The periods field accepts whole numbers from 1 to 30, and a decimal entry such as 2.9 is truncated to 2 periods, so type the whole number you mean. For the reverse direction, starting from a value and a target rate to solve for required growth or present values, our compound annual growth calculator works the compounding formula from the other side.
The bars show why compounding is not just the rate times the number of periods: three periods at 30% do not add 90% of the starting value, they multiply it by 1.30 three times, for a total gain of about 119.7%. The gap between adding and compounding is small over one period and large over thirty, which is why the projection table prints every period instead of only the last one.
The base effect: the starting value decides the story
Percentages put changes of very different sizes on one scale, and that is both their power and their trap. A company growing revenue by 1,000,000 sounds far more impressive than one growing by 100,000, until the starting values enter the picture: the first company started at 100,000,000, the second at 200,000. The real story is 1% growth against 50% growth.
This is why the results box always pairs the percentage with the growth amount, and why serious reporting does the same. Official growth figures work this way too: the GDP releases on the Bureau of Economic Analysis GDP data pages quote percentage change against the previous period, and comparing quarters of different lengths or definitions would distort the story in exactly the same way. Compare equal-length periods, keep the units identical, and read the amount and the percentage together.
What competing calculators miss
Most top-ranked percentage increase calculators stop at the two-value answer: a percentage, sometimes the difference, and nothing after it. Three gaps show up again and again. First, almost none of them project the rate forward, so the natural next question, what this pace would be worth in a few periods, needs a second tool; the projection tab here answers it with a full period table. Second, one ranked percent growth guide teaches a per-period rate by dividing the total percent growth by the number of periods, which is simple averaging, not compounding: a 50% gain over 5 years is not 10% compounded per year, it is about 8.45%, and the difference grows with the total. Third, several percentage change tools silently divide by the absolute value of the starting value, which changes the answer for negative baselines without saying so on the results screen.
This calculator takes the plainer route on each point: it shows the amount, the percentage, the reading, and the three steps with your numbers in them; it compounds projections period by period instead of dividing a total; and it divides by the starting value exactly as entered, with the negative-baseline side effect explained openly in the FAQs rather than hidden. Its one plain limit is the mirror image of the third point: for losses, debts, and other negative starting values, the percentage sign flips and the absolute amounts are the honest comparison.
Frequently asked questions
Subtract the starting value from the ending value, divide the result by the starting value, and multiply by 100. For example, growth from 200 to 260 is (260 - 200) / 200 x 100 = 30%. The calculator shows the same three steps with your own numbers every time it runs, so you can check the math instead of trusting a bare percentage.
Percent growth is undefined with a zero starting value, because the formula divides by the starting value and division by zero has no meaning. The calculator stops with the message that the starting value cannot be zero. If something grew from nothing to something, report the absolute amount instead of a percentage.
It means the value shrank: the ending value is lower than the starting value, and the tool labels the result a decline. A result of -25% means the value lost one quarter of its starting size. A fall to exactly zero is -100%, and the result cannot go below -100% unless the ending value itself is negative.
Yes. Growing from 100 to 250 is 150% growth, and any ending value that more than doubles the starting value shows over 100% growth. There is no upper limit: growing from 1 to 1,000,000 is 99,999,900.00% in this tool, commas included.
Percent growth is the total change between two values, however much time sits between them. CAGR is the steady yearly rate that would compound the starting value into the ending value over a stated number of years. Percent growth answers how much it grew in total; CAGR answers how fast it grew per year. A 30% total gain could be one strong year or a decade of slow progress, and only the annualized rate separates the two stories.
Because each percentage is measured against a different starting value. Falling from 100 to 80 is -20%, but climbing back from 80 to 100 is +25%, not +20%. The deeper the fall, the larger the rise needed to recover: a 50% fall needs a 100% rise just to break even. The growth amount is the same in both directions; the percentage is not.
Projection mode compounds a growth rate forward, one period at a time: each period multiplies the current value by (1 + rate / 100). Enter a current value, a rate per period, and a whole number of periods from 1 to 30. The tool prints the value at the end of every period in a table, so growth of 65,000 at 30% per period runs 84,500.00, then 109,850.00, then 142,805.00 after three periods.
It computes them, but read the result with care. The formula divides by the starting value exactly as entered, with no absolute value step, so moving from -100 to 50 shows a growth amount of +150.00 next to -150.00% and a decline label. That sign flip is an artifact of a negative baseline, not a real decline. Percent growth is designed for positive starting values such as prices, revenue, users, and balances; for losses or debts, compare the absolute amounts instead.
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References
- Indeed Career Guide, "How to Calculate Growth Percentage Change (With Formula)" - step-by-step growth percentage method with the same 50,000 to 65,000 revenue example used on this page. Indeed: How to Calculate Growth Percentage Change. Accessed October 21, 2026.
- The Motley Fool, "How to Calculate Total Revenue Growth in Accounting" - the period-over-period revenue growth formula and why equal-length periods matter when growth rates are compared. Motley Fool: How to Calculate Total Revenue Growth. Accessed October 21, 2026.
- Investor.gov (US Securities and Exchange Commission), "Compound Interest Calculator" - the SEC compounding tool, a cross-check for the projection mode figures on this page. Investor.gov: Compound Interest Calculator. Accessed October 21, 2026.
- Investor.gov (US Securities and Exchange Commission), "Small Savings Add Up to Big Money" - explains compounding with everyday savings amounts, the effect projection mode compounds period by period. Investor.gov: Small Savings Add Up to Big Money. Accessed October 21, 2026.
- Khan Academy, "Compound Interest" - a step-by-step treatment of compounding and repeated percentage growth that matches the projection formula used here. Khan Academy: Compound Interest Tutorial. Accessed October 21, 2026.
- US Bureau of Economic Analysis, "Gross Domestic Product" - the official GDP data pages, the best-known real-world use of period growth rates reported quarter by quarter. BEA: Gross Domestic Product. Accessed October 21, 2026.