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How good is a 300 chess player?

Rates are per 100 live moves: moves played while the game is not already decided.

What the terms mean
Centipawn.
A hundredth of a pawn, the unit a chess engine scores a position in. Giving up a pawn for nothing costs about 100.
Centipawn loss.
How much worse a move is than the best move in the position. The average (ACPL) counts every move a player makes.
Blunder, mistake, inaccuracy.
A move that loses at least 150 centipawns is a blunder, at least 70 a mistake and at least 40 an inaccuracy. Only live moves are counted.
Only move.
A position where one move is clearly better than every other. “Finds the only move” is how often a player plays it.
Time trouble.
Less than a tenth of the starting time left on the clock. “Games in time trouble” is the share of games in which a player's clock got that low on any move, however the game stood.
Winning, better, balanced, worse.
How the engine scores the position for the player about to move. Balanced is within half a pawn either way, better is up to a pawn and a half ahead, winning is from there up to three pawns ahead, and worse is up to a pawn and a half behind.
+1, +2, +4.
A lead of at least one, two or four pawns by the engine's score. A lost position is one that has fallen two pawns behind or worse.
Percentile.
The share of a site's players who are rated lower. Blitz and rapid players are ranked separately.
Site
Time control

How strong is 300 Elo?

28%of Chess.com blitz players are rated below 300

72% are rated 300 or higher.

28.3blunders per 100 live moves

Chess.com blitz 3+0Chess.com blitz players at each rating
0204050010001500200025003000300Chess.com rating

What a 300 actually does

Measure200300400
Blunders31.628.325.3
Mistakes17.117.416.9
Inaccuracies10.510.711.1
Average centipawn loss101.394.387.7
Plays the engine's top move25%27%28%
Finds the only moveshare of positions with one real answer54%60%62%
Game length26.828.029.3
Live moves per gamemoves played while the game is not already decided9.410.311.3
How they use the clock
Games in time troubleunder a tenth of the clock31%28%28%
Seconds per move5.24.84.6
Instant movesplayed in two seconds or less31%33%35%
Clock left at move 8share of the starting clock82%84%86%
Clock left at move 15share of the starting clock60%63%66%
Clock left at move 30in games that get there27%30%31%
Clock left at move 50in games that get there16%17%16%
Moves played inside a scrambleown clock under a tenth3.3%3.5%3.3%
What the game looks like
Games that end decisivelywon or lost, not drawn97%98%97%
Reaches an endgame21%23%25%
Capturesper 100 own moves27.828.528.2
Checksper 100 own moves10.111.010.6

How others play against a 300

Measure200vs 300300vs 300400vs 300
Score against them38.5%50.0%58.8%
Score after reaching +146%59%65%
Score after reaching +248%61%68%
Ever loses from +445%32%26%
Score from lost positionsgames where their eval fell to minus two26%35%42%

Each column is how players of that rating do in their games against a 300.

Where a 300 blunders

Measure200300400
When in the game
Opening24.521.118.3
Middlegame40.936.732.8
Endgame34.929.327.1
In what kind of position
Winning31.126.525.3
Better23.921.418.7
Balanced21.317.915.7
Worse24.822.319.8
With how much clock left
Over half28.425.422.5
25 to 50%41.238.535.5
10 to 25%43.538.935.5
Under 10%52.241.940.4
With which piece
Queen35.934.030.5
Rook38.334.730.0
Knight32.628.526.0
Bishop29.425.322.7
Pawn28.925.923.4
King29.325.722.5

The four rows under “In what kind of position” leave out positions that are already won or already lost. Throwing away a won game still counts in the overall blunder rate, which is why that rate can be higher than all four.

When a 300 blunders most

Blunders per 100 live moves

When in the game

Most in the middlegame: 74% more often than in the opening.

  • 300, Opening: 21.1
  • 300, Middlegame: 36.7
  • 300, Endgame: 29.3

In what kind of position

Most when winning: 48% more often than in a balanced game.

  • 300, Winning: 26.5
  • 300, Better: 21.4
  • 300, Balanced: 17.9
  • 300, Worse: 22.3

With how much clock left

Most with under 10% of the clock: 65% more often than with over half the clock.

  • 300, Over half: 25.4
  • 300, 25 to 50%: 38.5
  • 300, 10 to 25%: 38.9
  • 300, Under 10%: 41.9

With which piece

Most on rook moves: 37% more often than on bishop moves.

  • 300, Queen: 34.0
  • 300, Rook: 34.7
  • 300, Knight: 28.5
  • 300, Bishop: 25.3
  • 300, Pawn: 25.9
  • 300, King: 25.7

How much 300-rated players differ

Measure5%25%75%95%
Blunders20.625.632.638.1
Mistakes15.016.418.620.3
Inaccuracies8.49.711.513.0
Finds the only move48%54%64%70%
Seconds per move3.1s4.0s5.4s6.6s
Games in time trouble4%16%38%53%

Each column is a share of 300-rated players: a quarter are at or under the 25% figure, three quarters at or under the 75% one.

The move quality range a 300 plays in

200 to 400is how half of 300-rated players play, going by how often they blunder

Nine in ten: 100 to 650.

Of 100 players rated 300, how many blunder

  • like a 200 or lower26
  • like a 30046
  • like a 400 or higher28

What separates a 300 from a 600

Skill, and what trains it300600Gap
Opening blundersthe first ten moves of your openings21.114.034% lower
Middlegame blundersa check-captures-threats scan every move36.727.026% lower
Composure after an errorresetting after you drop something9.6%7.4%23% lower
Finds the quiet best movepositions where nothing is forcing40%48%+8 pts
Finds the defensive savedefending worse positions instead of collapsing42%50%+8 pts
Endgame blundersrook endings and king activity29.324.018% lower
Trades down when aheadconverting an advantage by liquidating41%46%+5 pts
Takes the free materialspotting hanging pieces before anything else72%80%+8 pts
Sees the deeper wincalculating past the third move of a line27%28%+1 pt
Finds the forkknight and queen forks, both directions36%36%no gain

What a 300 plays

As White

  • 1.e4 King's Pawn 63.5%, scores 45.9%
  • 1.d4 Queen's Pawn 18.8%, scores 47.9%
  • 1.e3 Van't Kruijs 5.5%, scores 45.3%
  • every other move 12%

Against 1.e4

  • 1...e5 Open Game 55.8%, scores 45.0%
  • 1...d5 Scandinavian Defense 14.8%, scores 46.4%
  • 1...e6 French Defense 7.8%, scores 45.6%
  • every other move 22%

Against 1.d4

  • 1...d5 Closed Game 46.1%, scores 46.9%
  • 1...e5 Englund Gambit 13.2%, scores 39.4%
  • 1...e6, usually a French or Queen's Gambit 11.8%, scores 45.1%
  • every other move 29%

300 on each site and time control

Played onBlundersMistakesInaccsACPLOnly move
Chess.com blitz 3+028.317.410.794.360%
Chess.com blitz 5+026.617.110.889.761%
Chess.com rapid 10+033.016.99.798.453%
Lichess blitz 3+0ladder starts at 600
Lichess blitz 5+0ladder starts at 600
Lichess rapid 10+0ladder starts at 600

A rating number only means something inside one pool. Chess.com 300 in blitz 3+0 is about 815 on Lichess. Full conversion tables

What punishes a 300

Share of all blunders, by the idea that refuted them

Most often a piece left hanging: 28% of all blunders, against 26% at 600.

  • 300, Piece left hanging: 28%
  • 300, Fork: 12%
  • 300, Losing exchange: 11%
  • 300, Discovered attack: 10%
  • 300, Pin or skewer: 7%

Frequently asked about 300-rated players

Answered for Chess.com blitz 3+0, the choice at the top of the page.

Is 300 a good chess rating?

300 is near the bottom of the range of chess ratings. 28% of Chess.com blitz players are rated below 300, but the middle player there is rated only about 485. The word is for how a 300 plays, not for where it ranks on Chess.com: move for move, a 300 on Chess.com plays like an 815 on Lichess, where 5% of blitz players are rated lower.

What percentile is 300 Elo?

A 300 rating is about the 28th percentile on Chess.com. 72% of Chess.com blitz players are rated 300 or higher. Every rating side by side: the Chess.com rating guide.

How accurate is a 300 rated chess player?

A 300-rated player plays the engine's top choice on 27% of moves in Chess.com blitz 3+0 and loses 94.3 centipawns per move on average. Going up the ratings, 300 is where the average loss first drops under 95 centipawns a move.

How many blunders does a 300 make per game?

A 300-rated player makes about 2.9 blunders per game in Chess.com blitz 3+0, counting a move that loses at least 150 centipawns while the game is not already decided. A 600 makes about 2.8.

Do 300 rated players blunder more in time trouble?

Yes. With under 10% of the clock left, a 300-rated player blunders 1.6 times as often as with more than half of it. A 300 gets that low on time in 28% of games in Chess.com blitz 3+0. The effect is bigger higher up: 1.9 times as often for a 600.

What mistakes do 300 rated players make?

28% of the blunders a 300-rated player makes in Chess.com blitz 3+0 are a piece simply left hanging, the most common kind. That share is 26% at 600. Next come blunders involving a fork, at 12%.

When in the game do 300 rated players blunder most?

A 300-rated player blunders most in the middlegame in Chess.com blitz 3+0: on 36.7 of every 100 live moves there, against 29.3 in the endgame and 21.1 in the opening.

What openings do 300 rated players play?

As White in Chess.com blitz 3+0, 63.5% of players rated around 300 open with e4, the King's Pawn, and 18.8% open with d4, the Queen's Pawn. Around 600, e4 is opened by 63.0%. Against e4, the most common reply is e5, the Open Game, played in 55.8% of games, ahead of d5, the Scandinavian Defense, at 14.8%.

How does a 300 do against a 400?

A 300 scores 41.2% against a 400 in Chess.com blitz 3+0. Against a 200 they score 61.5%.

What is 300 on Chess.com in Lichess rating?

A 300 on Chess.com is about 815 on Lichess in blitz 3+0, 515 points higher. The gap between the two sites changes with rating, so no single number converts every rating. Every rating converted, both ways: Chess.com vs Lichess ratings.

Is a 300 in blitz as strong as a 300 in rapid?

No, the blitz players are the stronger. On Chess.com, players rated 300 in blitz 3+0 play about as well, move for move, as players rated 384 in rapid 10+0. That compares the quality of the moves, not what one player would be rated at both speeds. Every rating at both speeds: blitz vs rapid ratings.

300 rating everywhere else

This page opens on Chess.com blitz 3+0, and the choice at the top changes every table on it. The same tables and answers for the other two are below.

Chess.com blitz 5+0

What a 300 actually does in Chess.com blitz 5+0

Measure200300400
Blunders30.926.623.7
Mistakes17.217.116.3
Inaccuracies10.210.811.1
Average centipawn loss98.489.783.4
Plays the engine's top move26%28%29%
Finds the only moveshare of positions with one real answer56%61%64%
Game length27.928.529.7
Live moves per gamemoves played while the game is not already decided9.610.611.8
How they use the clock
Games in time troubleunder a tenth of the clock19%18%17%
Seconds per move7.16.86.5
Instant movesplayed in two seconds or less22%23%25%
Clock left at move 8share of the starting clock86%87%88%
Clock left at move 15share of the starting clock68%69%71%
Clock left at move 30in games that get there36%38%40%
Clock left at move 50in games that get there22%23%25%
Moves played inside a scrambleown clock under a tenth2.2%2.4%2.4%
What the game looks like
Games that end decisivelywon or lost, not drawn97%97%97%
Reaches an endgame24%24%24%
Capturesper 100 own moves27.327.627.3
Checksper 100 own moves11.110.610.9

How others play against a 300 in Chess.com blitz 5+0

Result200300400
How the game goes
Score against them37.1%50.0%60.0%
Converting and defending
Score after reaching +151%64%73%
Score after reaching +255%68%76%
Ever loses from +434%24%16%
Score from lost positionsgames where their eval fell to minus two25%35%42%

Each column is how players of that rating do in their games against a 300.

Where a 300 blunders in Chess.com blitz 5+0

Measure200300400
When in the game
Opening24.319.817.0
Middlegame39.434.230.7
Endgame32.529.426.5
In what kind of position
Winning30.125.423.1
Better24.119.817.5
Balanced21.017.315.1
Worse23.420.518.6
With how much clock left
Over half28.824.421.8
25 to 50%40.937.233.5
10 to 25%40.237.233.8
Under 10%48.140.736.4
With which piece
Queen36.130.727.7
Rook38.432.328.9
Knight31.727.023.8
Bishop27.923.821.3
Pawn28.424.922.4
King28.125.121.4

The four rows under “In what kind of position” leave out positions that are already won or already lost. Throwing away a won game still counts in the overall blunder rate, which is why that rate can be higher than all four.

How much 300-rated players differ in Chess.com blitz 5+0

Measure5%25%75%95%
Blunders21.124.429.634.1
Mistakes14.715.918.119.8
Inaccuracies9.110.011.312.3
Finds the only move51%56%65%71%
Seconds per move4.6s5.7s7.6s9.0s
Games in time trouble2%9%23%38%

Each column is a share of 300-rated players: a quarter are at or under the 25% figure, three quarters at or under the 75% one.

What separates a 300 from a 600 in Chess.com blitz 5+0

Skill, and what trains it300600Gap
Opening blundersthe first ten moves of your openings19.813.134% lower
Finds the forkknight and queen forks, both directions35%46%+11 pts
Endgame blundersrook endings and king activity29.421.327% lower
Middlegame blundersa check-captures-threats scan every move34.226.622% lower
Finds the defensive savedefending worse positions instead of collapsing41%50%+9 pts
Composure after an errorresetting after you drop something9.2%7.2%21% lower
Finds the quiet best movepositions where nothing is forcing45%51%+6 pts
Trades down when aheadconverting an advantage by liquidating44%49%+5 pts
Takes the free materialspotting hanging pieces before anything else74%81%+7 pts
Sees the deeper wincalculating past the third move of a line27%32%+5 pts

What a 300 plays in Chess.com blitz 5+0

As White
First moveShareScore
1.e4King's Pawn64.9%47.3%
1.d4Queen's Pawn18.9%48.4%
1.e3Van't Kruijs5.1%44.6%
Every other move11%n/a
Against 1.e4
ReplyShareScore
1...e5Open Game58.1%43.0%
1...d5Scandinavian Defense14.6%47.4%
1...e6French Defense6.2%45.8%
Every other move21%n/a
Against 1.d4
ReplyShareScore
1...d5Closed Game51.3%40.7%
1...e61...e6, usually a French or Queen's Gambit11.9%38.9%
1...e5Englund Gambit9.7%49.3%
Every other move27%n/a

What punishes a 300 in Chess.com blitz 5+0

The idea that refuted the blunderShare of blunders
Piece left hanging27%
Losing exchange13%
Discovered attack11%
Fork10%
Pin or skewer8%

Questions about a 300 in Chess.com blitz 5+0

Chess.com blitz 5+0: Is 300 a good chess rating?
300 is near the bottom of the range of chess ratings. 28% of Chess.com blitz players are rated below 300, but the middle player there is rated only about 485. The word is for how a 300 plays, not for where it ranks on Chess.com: move for move, a 300 on Chess.com plays like an 810 on Lichess, where 5% of blitz players are rated lower.
Chess.com blitz 5+0: What percentile is 300 Elo?
A 300 rating is about the 28th percentile on Chess.com. 72% of Chess.com blitz players are rated 300 or higher. Every rating side by side: the Chess.com rating guide.
Chess.com blitz 5+0: How accurate is a 300 rated chess player?
A 300-rated player plays the engine's top choice on 28% of moves in Chess.com blitz 5+0 and loses 89.7 centipawns per move on average. Going up the ratings, 300 is where the average loss first drops under 90 centipawns a move.
Chess.com blitz 5+0: How many blunders does a 300 make per game?
A 300-rated player makes about 2.8 blunders per game in Chess.com blitz 5+0, counting a move that loses at least 150 centipawns while the game is not already decided. 300 is the first rating to average under 3 blunders a game.
Chess.com blitz 5+0: Do 300 rated players blunder more in time trouble?
Yes. With under 10% of the clock left, a 300-rated player blunders 1.7 times as often as with more than half of it. A 300 gets that low on time in 18% of games in Chess.com blitz 5+0. The effect is about the same for a 600.
Chess.com blitz 5+0: What mistakes do 300 rated players make?
27% of the blunders a 300-rated player makes in Chess.com blitz 5+0 are a piece simply left hanging, the most common kind. That share is 26% at 600. Next come blunders involving a losing exchange, at 13%.
Chess.com blitz 5+0: When in the game do 300 rated players blunder most?
A 300-rated player blunders most in the middlegame in Chess.com blitz 5+0: on 34.2 of every 100 live moves there, against 29.4 in the endgame and 19.8 in the opening.
Chess.com blitz 5+0: What openings do 300 rated players play?
As White in Chess.com blitz 5+0, 64.9% of players rated around 300 open with e4, the King's Pawn, and 18.9% open with d4, the Queen's Pawn. Around 600, e4 is opened by 66.3%. Against e4, the most common reply is e5, the Open Game, played in 58.1% of games, ahead of d5, the Scandinavian Defense, at 14.6%.
Chess.com blitz 5+0: How does a 300 do against a 400?
A 300 scores 40.0% against a 400 in Chess.com blitz 5+0. Against a 200 they score 62.9%.
Chess.com blitz 5+0: What is 300 on Chess.com in Lichess rating?
A 300 on Chess.com is about 810 on Lichess in blitz 5+0, 510 points higher. The gap between the two sites changes with rating, so no single number converts every rating. Every rating converted, both ways: Chess.com vs Lichess ratings.
Chess.com blitz 5+0: Is a 300 in blitz as strong as a 300 in rapid?
No, the blitz players are the stronger. On Chess.com, players rated 300 in blitz 5+0 play about as well, move for move, as players rated 446 in rapid 10+0. That compares the quality of the moves, not what one player would be rated at both speeds. Every rating at both speeds: blitz vs rapid ratings.

Chess.com rapid 10+0

What a 300 actually does in Chess.com rapid 10+0

Measure200300400
Blunders37.133.028.9
Mistakes16.716.917.0
Inaccuracies9.49.710.4
Average centipawn loss106.698.490.2
Plays the engine's top move24%26%28%
Finds the only moveshare of positions with one real answer50%53%59%
Game length29.529.429.8
Live moves per gamemoves played while the game is not already decided8.99.510.2
How they use the clock
Games in time troubleunder a tenth of the clock6%6%6%
Seconds per move9.49.39.1
Instant movesplayed in two seconds or less16%16%18%
Clock left at move 8share of the starting clock90%90%91%
Clock left at move 15share of the starting clock78%78%79%
Clock left at move 30in games that get there54%54%55%
Clock left at move 50in games that get there36%37%40%
Moves played inside a scrambleown clock under a tenth1.2%1.1%1.0%
What the game looks like
Games that end decisivelywon or lost, not drawn95%95%96%
Reaches an endgame29%26%27%
Capturesper 100 own moves26.127.227.3
Checksper 100 own moves11.612.612.7

How others play against a 300 in Chess.com rapid 10+0

Result200300400
How the game goes
Score against them36.8%50.0%58.5%
Converting and defending
Score after reaching +154%64%72%
Score after reaching +256%66%74%
Ever loses from +432%23%18%
Score from lost positionsgames where their eval fell to minus two23%33%39%

Each column is how players of that rating do in their games against a 300.

Where a 300 blunders in Chess.com rapid 10+0

Measure200300400
When in the game
Opening30.826.322.7
Middlegame45.941.536.5
Endgame31.931.028.2
In what kind of position
Winning33.230.627.0
Better29.526.621.9
Balanced25.322.018.7
Worse29.024.822.3
With how much clock left
Over half36.332.028.1
25 to 50%43.742.238.2
10 to 25%41.540.134.3
Under 10%46.041.131.6
With which piece
Queen43.338.234.2
Rook44.639.334.0
Knight36.733.828.7
Bishop34.930.726.7
Pawn34.230.126.9
King32.529.525.9

The four rows under “In what kind of position” leave out positions that are already won or already lost. Throwing away a won game still counts in the overall blunder rate, which is why that rate can be higher than all four.

How much 300-rated players differ in Chess.com rapid 10+0

Measure5%25%75%95%
Blunders27.731.035.639.0
Mistakes14.615.817.719.4
Inaccuracies7.98.810.311.4
Finds the only move43%50%58%65%
Seconds per move5.3s7.4s10.6s12.9s
Games in time trouble0%1%8%20%

Each column is a share of 300-rated players: a quarter are at or under the 25% figure, three quarters at or under the 75% one.

What separates a 300 from a 600 in Chess.com rapid 10+0

Skill, and what trains it300600Gap
Finds the forkknight and queen forks, both directions30%42%+12 pts
Opening blundersthe first ten moves of your openings26.316.538% lower
Sees the deeper wincalculating past the third move of a line25%33%+8 pts
Trades down when aheadconverting an advantage by liquidating37%48%+11 pts
Endgame blundersrook endings and king activity31.022.029% lower
Middlegame blundersa check-captures-threats scan every move41.529.529% lower
Composure after an errorresetting after you drop something10.9%7.9%28% lower
Finds the quiet best movepositions where nothing is forcing40%49%+9 pts
Finds the defensive savedefending worse positions instead of collapsing38%46%+8 pts
Takes the free materialspotting hanging pieces before anything else67%78%+11 pts

What a 300 plays in Chess.com rapid 10+0

As White
First moveShareScore
1.e4King's Pawn65.4%48.0%
1.d4Queen's Pawn17.2%49.4%
1.e3Van't Kruijs5.1%48.4%
Every other move12%n/a
Against 1.e4
ReplyShareScore
1...e5Open Game59.2%44.2%
1...d5Scandinavian Defense12.4%43.7%
1...e6French Defense6.4%43.0%
Every other move22%n/a
Against 1.d4
ReplyShareScore
1...d5Closed Game46.5%44.4%
1...e5Englund Gambit12.3%42.2%
1...e61...e6, usually a French or Queen's Gambit12.2%43.3%
Every other move29%n/a

What punishes a 300 in Chess.com rapid 10+0

The idea that refuted the blunderShare of blunders
Piece left hanging27%
Losing exchange13%
Discovered attack11%
Fork10%
Pin or skewer8%

Questions about a 300 in Chess.com rapid 10+0

Chess.com rapid 10+0: Is 300 a good chess rating?
300 is near the bottom of the range of chess ratings. 26% of Chess.com rapid players are rated below 300, but the middle player there is rated only about 498. The word is for how a 300 plays, not for where it ranks on Chess.com: move for move, a 300 on Chess.com plays like a 734 on Lichess, where 4% of rapid players are rated lower.
Chess.com rapid 10+0: What percentile is 300 Elo?
A 300 rating is about the 26th percentile on Chess.com. 74% of Chess.com rapid players are rated 300 or higher. Every rating side by side: the Chess.com rating guide.
Chess.com rapid 10+0: How accurate is a 300 rated chess player?
A 300-rated player plays the engine's top choice on 26% of moves in Chess.com rapid 10+0 and loses 98.4 centipawns per move on average. Going up the ratings, 300 is where the average loss first drops under 100 centipawns a move.
Chess.com rapid 10+0: How many blunders does a 300 make per game?
A 300-rated player makes about 3.1 blunders per game in Chess.com rapid 10+0, counting a move that loses at least 150 centipawns while the game is not already decided. The first rating to average under 3 blunders a game is 400.
Chess.com rapid 10+0: Do 300 rated players blunder more in time trouble?
A little. With under 10% of the clock left, a 300-rated player blunders 28% more often than with more than half of it. A 300 gets that low on time in 6% of games in Chess.com rapid 10+0. The effect is bigger higher up: 1.5 times as often for a 600.
Chess.com rapid 10+0: What mistakes do 300 rated players make?
27% of the blunders a 300-rated player makes in Chess.com rapid 10+0 are a piece simply left hanging, the most common kind. That share is 24% at 600. Next come blunders involving a losing exchange, at 13%.
Chess.com rapid 10+0: When in the game do 300 rated players blunder most?
A 300-rated player blunders most in the middlegame in Chess.com rapid 10+0: on 41.5 of every 100 live moves there, against 31.0 in the endgame and 26.3 in the opening.
Chess.com rapid 10+0: What openings do 300 rated players play?
As White in Chess.com rapid 10+0, 65.4% of players rated around 300 open with e4, the King's Pawn, and 17.2% open with d4, the Queen's Pawn. Around 600, e4 is opened by 69.8%. Against e4, the most common reply is e5, the Open Game, played in 59.2% of games, ahead of d5, the Scandinavian Defense, at 12.4%.
Chess.com rapid 10+0: How does a 300 do against a 400?
A 300 scores 41.5% against a 400 in Chess.com rapid 10+0. Against a 200 they score 63.2%.
Chess.com rapid 10+0: What is 300 on Chess.com in Lichess rating?
A 300 on Chess.com is about 734 on Lichess in rapid 10+0, 434 points higher. The gap between the two sites changes with rating, so no single number converts every rating. Every rating converted, both ways: Chess.com vs Lichess ratings.
Chess.com rapid 10+0: Is a 300 in rapid as strong as a 300 in blitz?
No, the rapid players are the weaker. On Chess.com, players rated 300 in rapid 10+0 play about as well, move for move, as players rated 216 in blitz 3+0. That compares the quality of the moves, not what one player would be rated at both speeds. Every rating at both speeds: blitz vs rapid ratings.