1% Better Calculator
Compound Growth Tool
Use this 1% better calculator to see how small daily gains compound into outsized results. The 1% rule says that if you improve by just one percent per day, each new gain builds on the last instead of adding in a straight line. That is why the famous formula 1.01^365 = 37.8: after 365 days, a 1% daily improvement is roughly 37.8× your starting point. This free compound growth calculator lets you change the starting level, daily percentage, and number of days to model habits, fitness, skills, career output, or business metrics without a spreadsheet. Use it as a compound growth calculator for a 30-day sprint, a 90-day challenge, or a full year, then compare the better and worse curves side by side. It also shows the flip side of the 1 percent rule calculator: getting 1% worse daily compounds downward toward zero. Try different assumptions to make the math behind tiny consistent progress visible before you choose the habit you want to track next.
Your baseline (e.g. 1.0)
Track your daily habits in UpLvl and turn today's tiny improvement into a visible streak.
Growth curves
+1% daily (green) vs −1% daily (red) over 365 days
The 1% rule — why tiny gains are not tiny forever
Improve by just 1% each day and you'll be 37.78× better in a year — not 365% better, because progress compounds. Popularized by James Clear in Atomic Habits, the 1% rule borrows from compound interest: a small gain looks trivial in isolation, but repeated daily it creates an enormous gap.
The reverse is equally powerful: decline by 1% daily and you'll reach near zero in a year. The asymmetry between growth and decay is why consistent small habits outperform occasional heroic efforts.
Use this calculator to see what your specific improvement rate looks like over any time period — whether it's fitness, a skill, a business metric, or a habit streak.
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1% better calculator questions
What is the 1% rule?+
The 1% rule is the idea that improving by a tiny amount every day can create a much larger long-term result because each gain builds on the previous one.
What is 1.01 to the power of 365?+
1.01^365 equals about 37.8, so a 1% daily improvement compounds to roughly 37.8 times your starting point after one year.
How does 1% daily improvement compound?+
Daily improvement compounds by multiplying your current level by 1.01 each day. After many repeated days, the gains accelerate instead of adding up in a straight line.
How do I use this 1 percent rule calculator?+
Enter your starting level, choose a daily improvement percentage, and set the number of days. The calculator shows both positive compounding and the impact of declining by the same percentage.
Is this only for habits?+
No. You can use this compound growth calculator for habits, fitness, learning, career progress, business metrics, or any area where small repeated changes matter.