1. Remaining gap
remaining = max(0, target − current). The gap is how much brushing progress stands between where the meter sits now and where you want it. Clamping at zero keeps a target behind you from producing negative brushes.
Brush Angry Cat Calculator
Enter current progress, a target, progress per brush, and your observed brushes per minute for a local planning estimate — the formula, a worked example, and interpretation notes below.
The short version
This estimator turns your own brushing numbers into a time plan: gap to target, brushes needed, minutes required. It runs entirely in your browser and hard-codes no game rate, because Brush Angry Cat's creators document none. Measure once per session, enter four numbers, and you get a session plan that updates the moment your pace does.
Your observations
Enter your brushing pace
Measure your own in-game rate. This tool does not assume hidden upgrade multipliers or an official formula.
Player-input estimate
Time and actions remaining
Fill in all four fields to calculate an estimate.
Results change with your device, upgrades, timing, and session. Treat this as a planning estimate, not a guarantee.
Methodology
How the math works
The tool performs three divisions you can verify by hand — no hidden constants, no claimed in-game formula.
2. Brushes needed
brushes = ceil(remaining ÷ progress per brush). Each brush moves the meter by your measured amount, so the gap divided by that amount is the stroke count, rounded up — a fraction of a brush is still a brush.
3. Minutes required
minutes = brushes ÷ brushes per minute. Your one-minute stroke tally is the pace, and the tool converts the stroke count into session time at that pace — the number you actually plan around.
Worked example
Sample numbers through the tool
Illustration arithmetic with example inputs — not constants from the game; your own readings replace every number.
Say your cat's brushing meter reads 4,200 and you want it at 10,000 before logging off. One brush moves the meter 25, and your 60-second tally counted 30 brushes.
The gap is 10,000 − 4,200 = 5,800. Brush strokes: 5,800 ÷ 25 = 232 brushes, already whole. Session time: 232 ÷ 30 ≈ 7.7 minutes, so a little under eight minutes of steady brushing at the pace you sampled.
Suppose the second half of that meter gains a thicker-fur cat and your measured pace drops to 20 brushes per minute. The same 232 strokes now cost 232 ÷ 20 = 11.6 minutes. The inputs changed, so the plan changes — re-measure instead of reusing an old pace.
Honest limits
What this tool is and is not
It is a personal planning aid
Every input is yours, so the output is a faithful projection of your own measured pace — the only kind of projection this game's public record supports. It is ideal for deciding whether a goal fits tonight's session and for comparing fur samples fairly.
It is not a game-data oracle
It computes no hidden multiplier, drop rate, or leaderboard position — the official page documents none. If the creator ever publishes official rates, the tool's formula stays valid; only your inputs get easier to fill.
FAQ
Calculator questions
What does the Brush Angry Cat calculator actually compute?
Three numbers from your four inputs: the remaining gap (target minus current), how many brushes that gap takes at your observed progress per brush, and how many minutes those brushes take at your observed brushing pace. It is straightforward division on purpose — every input is a number you read off your own game, so the output is as honest as your sample.
Where do the four inputs come from?
All four come from your own session. Current and target progress are whatever the game's brushing meter shows you now and where you want it to land. Progress per brush is the meter movement from one brush. Brushes per minute is a 60-second count: brush at your normal rhythm for one minute and tally the strokes. Take each reading from the same cat and the same fur so the numbers describe one consistent situation.
Why doesn't the calculator use official game rates?
Brush Angry Cat's creators have documented no stat table, upgrade formula, or brushing-rate constant anywhere on the official page or group as of 2026-10-03. Any built-in rate would be invented, so the tool inverts the problem: it uses your measured pace, which is real by definition, and scales cleanly when your pace changes.
My estimate says 40 minutes but the game feels slower. Why?
The math assumes your sample pace holds for the whole session. Pace usually decays as sessions stretch — attention drops, other players hog cats, or fur with more resistance appears. If the first third of a session runs to plan, re-measure and re-enter the fresher pace rather than trusting one sample for an hour.
Can I use the calculator to compare cats or fur?
Yes — that is its best use. Run one 60-second sample per cat, feed each through the tool, and the brushes-per-minute result is a fair personal ranking of which fur you currently handle fastest. Keep the session conditions the same between samples so the comparison measures the cats, not the day.
Next steps
Planning a longer grind? The session planner turns a pace into a session target, and the progress notes explain the measurement routine behind good inputs. For the in-game loop itself, start at the how-to-play guide, and check code status before long sessions so free rewards never go unclaimed. Sources for every claim on this page are listed on the sources page.