Draw a Perfect Circle

Draw a circle roond the dot in ae go an see hoo roond it is, as ye draw. Free, nae sign-up.

Bi the Helibrain teamChecked bi Robert(Inglis), PhD candidate in biophysicsPit oot Last checked

Hoo tae read yer score

  • Roundness: 100% minus hoo far yer line strayed fae the circle that fits best, on average, as a share o that circle's radius. A line that wavers by 2% on average scores 98%.
  • The colours o yer line: green whaur the line sits on the circle, through yellae, tae reid whaur it strays far.
  • The dashed circle: the circle that fits best yer drawin. The closer yer line hugs it, the higher the score.
  • Yer best: yer highest score in this browser, kept separate for touch an moose, acause a finger an a moose draw gey different.
  • Direction: clockwise or counterclockwise. Maist fowk in the US draw counterclockwise; in Japan maist draw clockwise [1].

Can ye draw a perfect circle bi haund?

No quite, but ye can come close. A circle drawn bi haund aye wavers a wee, acause the haund slows doon an speeds up as it steers roond the curve [2]. On oor scale, a line that strays fae its circle by 2% on average scores 98%. The weel-kent viral circle bi a Canadian maths teacher measures aboot 99.7% roond, by ae blogger's estimate [3].

Quick facts

  • Direction depends on whaur ye grew up: in aboot 50,000 US drawings in Google's Quick, Draw! gemme, 86% o circles were drawn counterclockwise; in aboot 800 Japanese drawings, 80% went clockwise [1].
  • Writin habits shape it: Japanese bairns draw mair clockwise as they gang through schuil, an US bairns mair counterclockwise; Japanese bairns livin in the US drew less clockwise [4].
  • The haund's speed rule: the haund gangs mair slowly in tight curves an faster on flatter pairts (the "two-thirds power law"). On a circle the curve is the same aa the wey roond, sae the rule predicts an even speed [2][5].
  • The "warld champion": the maths teacher in the viral circle video later said his "warld freehand circle drawin champion" title wis a joke he telt his classes [6].
  • No a sign o ill-health: an idea fae the 1970s that drawin circles clockwise wis a warnin sign o mental illness got nae support in later research [7].

Hoo the circle test works

  1. Draw. Pit yer finger (or the moose button) doon onywhaur an draw yin circle roond the dot, in ae stroke.
  2. Watch as ye gang. Ance ye've gane pairt o the wey roond, the roundness shows in the middle an the line chynges colour.
  3. Lift. Whan ye're feenished, the circle that fits best appears dashed an yer drawin gets a score.

For a drawin tae count, it maun gang at least 320° o the wey roond, end near whaur it stertit, be big eneuch (a radius o at least 15% o the drawin area's width) an tak less than 30 seconds. Ae loop alane, please. We fit a circle tae yer points by least squares an measure their average distance fae it. Finger circles are compared wi finger circles alane.

Why is a perfect circle sae hard?

Drawin a circle asks yer shouther, elbow, wrist an fingers tae work thegither while the direction o the movement chynges aa the time. Yer haund naturally speeds up an slows doon wi the curve [2], an ilka chyng in speed is a chance tae drift ootwart or inwart. On a phone, yer finger hides the line ye're drawin an aw. A moose moves yer hale airn, which is why moose circles an finger circles get different scores.

Tips for a mair roond circle

  • Draw bigger an use yer hale airn. Wee circles drawn wi the fingers alane waver mair.
  • Keep an even speed. No ower slow: drawin gey slowly tends tae mak ye shake.
  • Look at the centre dot, no the line. Keepin the same distance fae the centre is the hale task.
  • Close the loop smoothly. Mony circles lose points at the end, whaur fowk rush tae meet the stert.

Whit this test can an cannae tell ye

The circle test is a fun challenge for control o the haund. Yer score depends on yer device, the size o yer screen, whether ye use a finger, pen or moose, an on practice. It's no a medical test or a test for tremor; doctors use ither drawin tasks, sic as spirals, for that [8]. The direction ye draw says naethin aboot yer health.

Aften-asked questions

Can ye draw a perfect circle bi haund?

Nae circle drawn bi haund is perfectly roond, but fowk can come close. In the Helibrain circle test, roundness is 100% minus the average wavering o yer line, sae a line that strays by 2% on average scores 98%. Tae reach exactly 100%, the line wad need nae wavering ava.

Do maist fowk draw circles clockwise or counterclockwise?

It depends on whaur ye grew up. In Google's Quick, Draw! drawings, 86% o aboot 50,000 US circles were counterclockwise, while 80% o aboot 800 Japanese circles were clockwise [1]. Writin habits seem tae matter mair than which haund ye use [4].

Hoo is ma roundness score wrocht oot?

The Helibrain circle test fits the best circle through aa the points o yer line (a least-squares fit), then measures hoo far ilka point is fae that circle. The average distance, as a share o the circle's radius, is yer wavering; roundness is 100% minus the wavering. An oval, a dent or an oerlap aa bring it doon.

Why is ma score different on ma phone an ma computer?

A finger an a moose use different muscles an different movements, an a phone screen is smaller. That's why the Helibrain circle test keeps yer best score separate for touch an moose, an compares results only wi the same kind o input.

Hoo dae ye draw a perfect circle withoot a compass?

Keep yer haund in place at the centre, uisin yer wee finger or wrist as a pivot, an turn the paper or yer airn roond it. Draw large circles freehand wi yer hale airn at an even speed. Practise on the test an watch the colours o yer line tae see whaur ye drift.

Is the Helibrain circle test really free?

Aye. The test an yer hale result are free: nae sign-up, nae email, nae peyment. Helibrain maks siller frae its app, which has a free plan an peyed plans; ye dinnae need the app tae tak the test.

Related tests

See aw 43 free brain tests

Want tae wark on this ilka day? The Helibrain app (in Inglis for noo) has a free plan an paid plans.

Cite this page: Draw a Perfect Circle. Helibrain. 2026. https://helibrain.com/sco/draw-a-perfect-circle. CC BY 4.0.

How this test works

This game tests how steady and even your hand is. Put your finger or the mouse button down and draw one circle around the dot in a single stroke. When you lift, we fit the best circle to your line and measure how far your line strays from it, on average. Your roundness score is 100% minus that average wobble, so a line that wobbles by 2% scores 98%. Motor-control labs have measured hand-drawn curves like this since the 1980s.

Version 1 · Cite this test:

Helibrain (2026). Draw a perfect circle, v1. https://helibrain.com/draw-a-perfect-circle/methods

Full method →

Soorces

  1. Sonnad N (2017). How do you draw a circle? We analyzed 100,000 drawings to show how culture shapes our instincts. Quartz, 15 June 2017 (analysis o Google's Quick, Draw! data). qz.com/994486/the-way-you-draw-circles-says-a-lot-about-you/
  2. Lacquaniti F, Terzuolo C, Viviani P (1983). The law relating the kinematic and figural aspects of drawing movements. Acta Psychologica 54(1–3):115–130. doi.org/10.1016/0001-6918(83)90027-6
  3. Höhle M (2018). Judging freehand circle drawing competitions. Blog post, 31 July 2018. mhoehle.github.io/blog/2018/07/31/circle.html
  4. Amenomori Y, Kono A, Fournier J, Winer GA (1997). A cross-cultural developmental study of directional asymmetries in circle drawing. Journal of Cross-Cultural Psychology 28(6):730–742. doi.org/10.1177/0022022197286005
  5. Fraser DS, Di Luca M, Cook JL (2025). Biological kinematics: a detailed review of the velocity-curvature power law calculation. Experimental Brain Research 243(5):107. doi.org/10.1007/s00221-025-07065-0
  6. Wikipedia. Alexander Overwijk. en.wikipedia.org/wiki/Alexander_Overwijk (checked 4 November 2026)
  7. Boake C, Salmon PG, Carbone CR (1983). Torque, lateral preference, and cognitive ability in primary-grade children. Journal of Abnormal Child Psychology 11(1):77–83. doi.org/10.1007/BF00912179
  8. Wang S, Schwirtlich T, et al. (2025). Clinical applications and measurement properties of the digitized Archimedes spiral drawing test: a scoping review. Movement Disorders Clinical Practice 12(11):1742–1755. doi.org/10.1002/mdc3.70278

How we made this page: scrieved bi the Helibrain team fae the studies listed abuin, an checked bi Robert(Inglis) (PhD candidate in biophysics) on 11/4/2026. We update it when the soorces chynges.