Understanding i-Ready Diagnostic Scores & Percentiles

December 15, 2022December 8, 2022 by Mastery Genius

i-Ready is an online learning platform for K-8 students that is used widely throughout schools in the United States. The i-Ready program allows parents and teacher to benchmark a child’s skill level in ready and math and provides personalized lessons depending on diagnostic scores.

If your child has recently taken an i-Ready Diagnostic test, you may be confused about what the score means and how to help your child improve. In this guide we break out typical i-Ready Diagnostic scores based on grade level (kindergarten through 8th grade) and time of year (fall, winter, and spring).

Click on your child’s grade below to see where students should be scoring depending on the time year. Remember – a score in the 50th percentile is considered “average”, so you can get a good idea of whether your student is behind or ahead of the curve and by how far.

Interested in helping your child improve in reading & math? Mastery Genius can help! For only $30 per month, we develop a personalized curriculum that pinpoints your child’s academic gaps and helps them master topics at their own pace – not the pace of an entire classroom.

i-Ready Diagnostic Scores & Percentiles by Grade

Click on your child’s grade below to get a better understanding of what their score means.

Kindergarten
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th Grade
7th Grade
8th Grade

Kindergarten

Fall

Below are the diagnostic scores and corresponding percentiles for kindergarten students taken between the beginning of the school year and November 15th.

Percentile	Math	Reading
1 – 9	<=298 – 312	<=286 – 307
10 – 19	313 – 321	309 – 321
20 – 29	322 – 328	322 – 329
30 – 39	329 – 335	330 – 335
40 – 49	335 – 341	336 – 341
50 – 59	342 – 347	341 – 347
60 – 69	347 – 352	348 – 356
70 – 79	353 – 360	357 – 366
80 – 89	361 – 370	367 – 382
90 – 99	371 – 392+	384 – 422+

Winter

Below are the diagnostic scores and corresponding percentiles for kindergarten students taken between the beginning November 16th and March 1st.

Percentile	Math	Reading
1 – 9	<=306 – 325	<=296 – 325
10 – 19	326 – 338	328 – 341
20 – 29	339 – 346	342 – 352
30 – 39	347 – 353	353 – 361
40 – 49	354 – 360	362 – 370
50 – 59	360 – 366	371 – 380
60 – 69	367 – 372	381 – 392
70 – 79	373 – 379	393 – 403
80 – 89	380 – 388	404 – 413
90 – 99	389 – 414+	414 – 465+

Spring

Below are the diagnostic scores and corresponding percentiles for kindergarten students taken between the beginning March 2nd and the end of the school year.

Percentile	Math	Reading
1 – 9	<=313 – 339	<=305 – 342
10 – 19	341 – 354	344 – 362
20 – 29	355 – 363	364 – 376
30 – 39	364 – 371	378 – 389
40 – 49	371 – 377	390 – 400
50 – 59	378 – 383	401 – 408
60 – 69	384 – 388	408 – 414
70 – 79	389 – 395	414 – 423
80 – 89	396 – 405	424 – 443
90 – 99	406 – 435+	447 – 504+

1st Grade

Fall

Below are the diagnostic scores and corresponding percentiles for 1st grade students taken between the beginning of the school year and November 15th.

Percentile	Math	Reading
1 – 9	<=312 – 338	<=308 – 344
10 – 19	340 – 352	347 – 364
20 – 29	353 – 362	366 – 378
30 – 39	363 – 370	380 – 391
40 – 49	370 – 375	392 – 402
50 – 59	376 – 381	403 – 409
60 – 69	382 – 388	410 – 416
70 – 79	388 – 393	417 – 427
80 – 89	393 – 402	429 – 453
90 – 99	404 – 431+	456 – 508+

Winter

Below are the diagnostic scores and corresponding percentiles for 1st grade students taken between the beginning November 16th and March 1st.

Percentile	Math	Reading
1 – 9	<=323 – 356	<=322 – 368
10 – 19	358 – 371	371 – 392
20 – 29	372 – 380	394 – 406
30 – 39	381 – 387	407 – 415
40 – 49	388 – 392	415 – 423
50 – 59	393 – 398	424 – 434
60 – 69	399 – 405	436 – 452
70 – 79	406 – 413	453 – 469
80 – 89	413 – 425	471 – 491
90 – 99	426 – 449+	494 – 535+

Spring

Below are the diagnostic scores and corresponding percentiles for 1st grade students taken between the beginning March 2nd and the end of the school year.

Percentile	Math	Reading
1 – 9	<=332 – 369	<=332 – 386
10 – 19	370 – 383	390 – 410
20 – 29	385 – 393	411 – 422
30 – 39	393 – 400	423 – 436
40 – 49	401 – 407	438 – 453
50 – 59	407 – 413	454 – 467
60 – 69	414 – 421	468 – 480
70 – 79	422 – 430	482 – 495
80 – 89	430 – 439	497 – 516
90 – 99	441 – 463+	520 – 553+

2nd Grade

Fall

Below are the diagnostic scores and corresponding percentiles for 2nd grade students taken between the beginning of the school year and November 15th.

Percentile	Math	Reading
1 – 9	<=333 – 367	<=339 – 389
10 – 19	369 – 381	393 – 411
20 – 29	382 – 390	413 – 424
30 – 39	390 – 396	425 – 443
40 – 49	396 – 402	443 – 459
50 – 59	402 – 408	460 – 473
60 – 69	409 – 414	475 – 487
70 – 79	414 – 422	489 – 503
80 – 89	423 – 434	505 – 522
90 – 99	435 – 458+	524 – 561+

Winter

Below are the diagnostic scores and corresponding percentiles for 2nd grade students taken between the beginning November 16th and March 1st.

Percentile	Math	Reading
1 – 9	<=348 – 381	<=351 – 407
10 – 19	383 0 395	410 – 431
20 – 29	396 – 404	434 – 457
30 – 39	405 – 411	459 – 474
40 – 49	412 – 417	475 – 488
50 – 59	418 – 424	489 – 500
60 – 69	425 – 432	502 – 513
70 – 79	433 – 441	515 – 527
80 – 89	443 – 449	528 – 542
90 – 99	450 – 471+	544 – 579+

Spring

Below are the diagnostic scores and corresponding percentiles for 2nd grade students taken between the beginning March 2nd and the end of the school year.

Percentile	Math	Reading
1 – 9	<=355 – 391	<=364 – 419
10 – 19	393 – 406	422 – 454
20 – 29	407 – 416	457 – 476
30 – 39	416 – 424	477 – 491
40 – 49	425 – 433	492 – 504
50 – 59	434 – 441	505 – 516
60 – 69	442 – 447	517 – 527
70 – 79	447 – 454	528 – 540
80 – 89	455 – 462	541 – 556
90 – 99	463 – 484+	558 – 592+

3rd Grade

Fall

Below are the diagnostic scores and corresponding percentiles for 3rd grade students taken between the beginning of the school year and November 15th.

Percentile	Math	Reading
1 – 9	<=354 – 387	<=365 – 416
10 – 19	390 – 403	419 – 448
20 – 29	404 – 412	451 – 471
30 – 39	413 – 420	473 – 486
40 – 49	420 – 427	488 – 500
50 – 59	428 – 434	502 – 515
60 – 69	435 – 441	516 – 527
70 – 79	441 – 447	528 – 540
80 – 89	448 – 456	541 – 556
90 – 99	456 – 480+	558 – 595+

Winter

Below are the diagnostic scores and corresponding percentiles for 3rd grade students taken between the beginning November 16th and March 1st.

Percentile	Math	Reading
1 – 9	<=365 – 402	<=372 – 432
10 – 19	404 – 419	437 – 472
20 – 29	420 – 429	474 – 492
30 – 39	430 – 437	494 – 509
40 – 49	437 – 444	512 – 521
50 – 59	444 – 449	522 – 532
60 – 69	450 – 455	534 – 544
70 – 79	455 – 461	545 – 557
80 – 89	462 – 469	558 – 573
90 – 99	471 – 496+	575 – 611+

Spring

Below are the diagnostic scores and corresponding percentiles for 3rd grade students taken between the beginning March 2nd and the end of the school year.

Percentile	Math	Reading
1 – 9	<=370 – 411	<=378 – 446
10 – 19	413 – 429	452 – 484
20 – 29	431 – 441	486 – 505
30 – 39	441 – 449	507 – 520
40 – 49	450 – 458	522 – 533
50 – 59	458 – 464	534 – 545
60 – 69	465 – 471	546 – 557
70 – 79	472 – 479	558 – 570
80 – 89	480 – 489	571 – 586
90 – 99	491 – 513+	588 – 625+

4th Grade

Fall

Below are the diagnostic scores and corresponding percentiles for 4th grade students taken between the beginning of the school year and November 15th.

Percentile	Math	Reading
1 – 9	<=371 – 408	<=382 – 447
10 – 19	410 – 425	453- 483
20 – 29	426 – 436	485 – 503
30 – 39	437 – 444	505 – 519
40 – 49	445 – 451	520 – 532
50 – 59	452 – 459	533 – 543
60 – 69	460 – 466	545 – 556
70 – 79	466 – 473	557 – 569
80 – 89	474 – 482	571 – 586
90 – 99	484 – 508+	588 – 627+

Winter

Below are the diagnostic scores and corresponding percentiles for 4th grade students taken between the beginning November 16th and March 1st.

Percentile	Math	Reading
1 – 9	<=380 – 419	<=390 – 466
10 – 19	421 – 438	472 – 500
20 – 29	439 – 448	502 – 520
30 – 39	449 – 458	522 = 534
40 – 49	459 – 565	536 – 547
50 – 59	465 – 470	548 – 559
60 – 69	471 – 477	560 – 570
70 – 79	478 – 485	572 – 583
80 – 89	486 – 495	585 – 600
90 – 99	496 – 518+	603 – 638+

Spring

Below are the diagnostic scores and corresponding percentiles for 4th grade students taken between the beginning March 2nd and the end of the school year.

Percentile	Math	Reading
1 – 9	<=385 – 426	<=393 – 473
10 – 19	429 – 447	478 – 509
20 – 29	448 – 461	512 – 528
30 – 39	462 – 469	530 – 543
40 – 49	470 – 478	545 – 557
50 – 59	479 – 485	558 – 569
60 – 69	486 – 492	570 – 581
70 – 79	493 – 501	582 – 593
80 – 89	502 – 513	595 – 612
90 – 99	514 – 530+	614 – 648+

5th Grade

Fall

Below are the diagnostic scores and corresponding percentiles for 5th grade students taken between the beginning of the school year and November 15th.

Percentile	Math	Reading
1 – 9	<=382 – 422	<=401 – 475
10 – 19	425 – 443	479 – 509
20 – 29	444 – 454	513 – 529
30 – 39	455 – 462	530 – 543
40 – 49	463 – 470	545 – 556
50 – 59	470 – 477	558 – 568
60 – 69	478 – 483	569 – 581
70 – 79	484 – 491	582 – 594
80 – 89	492 – 502	596 – 614
90 – 99	503 – 524+	616 – 648+

Winter

Below are the diagnostic scores and corresponding percentiles for 5th grade students taken between the beginning November 16th and March 1st.

Percentile	Math	Reading
1 – 9	<=392 – 434	<=405 – 488
10 – 19	437 – 452	493 – 522
20 – 29	453 – 464	524 – 541
30 – 39	465 – 472	543 – 556
40 – 49	473 – 480	558 – 568
50 – 59	480 – 487	570 – 580
60 – 69	487 – 494	582 – 592
70 – 79	494 – 501	593 – 607
80 – 89	502 – 512	609 – 623
90 – 99	512 – 535+	625 – 661+

Spring

Below are the diagnostic scores and corresponding percentiles for 5th grade students taken between the beginning March 2nd and the end of the school year.

Percentile	Math	Reading
1 – 9	<=396 – 439	<=408 – 494
10 – 19	442 – 460	499 – 530
20 – 29	461 – 471	531 – 550
30 – 39	472 – 481	551 – 564
40 – 49	482 – 490	566 – 577
50 – 59	490 – 496	579 – 589
60 – 69	497 – 505	591 – 604
70 – 79	505 – 513	605 – 618
80 – 89	514 – 524	619 – 633
90 – 99	525 – 544+	635 – 671+

6th Grade

Fall

Below are the diagnostic scores and corresponding percentiles for 6th grade students taken between the beginning of the school year and November 15th.

Percentile	Math	Reading
1 – 9	<=391 – 431	<=410 – 486
10 – 19	434 – 451	491 – 522
20 – 29	452 – 463	524 – 542
30 – 39	464 – 473	544 – 558
40 – 49	474 – 482	560 – 571
50 – 59	483 – 489	573 – 584
60 – 69	490 – 496	586 – 598
70 – 79	497 – 504	600 – 614
80 – 89	505 – 514	615 – 630
90 – 99	515 – 540	632 – 669+

Winter

Below are the diagnostic scores and corresponding percentiles for 6th grade students taken between the beginning November 16th and March 1st.

Percentile	Math	Reading
1 – 9	<=396 – 440	<=412 – 495
10 – 19	442 – 459	500 – 531
20 – 29	460 – 471	534 – 552
30 – 39	472 – 481	554 – 567
40 – 49	482 – 489	569 – 581
50 – 59	490 – 496	582 – 593
60 – 69	497 – 504	595 – 608
70 – 79	505 – 513	610 – 622
80 – 89	513 – 524	623 – 638
90 – 99	526 – 550+	640 – 679+

Spring

Below are the diagnostic scores and corresponding percentiles for 6th grade students taken between the beginning March 2nd and the end of the school year.

Percentile	Math	Reading
1 – 9	<=399 – 442	<=413 – 500
10 – 19	444 – 464	505 – 537
20 – 29	466 – 477	540 – 559
30 – 39	479 – 488	561 – 575
40 – 49	489 – 496	576 – 588
50 – 59	497 – 504	590 – 603
60 – 69	505 – 513	604 – 617
70 – 79	513 – 522	618 – 630
80 – 89	523 – 537	631 – 646
90 – 99	538 – 559+	648 – 682+

7th Grade

Fall

Below are the diagnostic scores and corresponding percentiles for 7th grade students taken between the beginning of the school year and November 15th.

Percentile	Math	Reading
1 – 9	<=401 – 441	<=418 – 501
10 – 19	444 – 462	508 – 538
20 – 29	463 – 475	540 – 559
30 – 39	476 – 486	560 – 574
40 – 49	486 – 493	576 – 589
50 – 59	493 – 500	590 – 604
60 – 69	501 – 507	605 – 618
70 – 79	508 – 514	619 – 630
80 – 89	516 – 529	632 – 645
90 – 99	530 – 558+	648 – 687+

Winter

Below are the diagnostic scores and corresponding percentiles for 7th grade students taken between the beginning November 16th and March 1st.

Percentile	Math	Reading
1 – 9	<=402 – 444	<=423 – 514
10 – 19	447 – 467	518 – 548
20 – 29	468 – 480	551 – 569
30 – 39	482 – 490	571 – 585
40 – 49	491 – 498	587 – 600
50 – 59	499 – 506	602 – 614
60 – 69	506 – 513	616 – 627
70 – 79	514 – 524	628 – 637
80 – 89	525 – 538	639 – 655
90 – 99	540 – 566+	657 – 695+

Spring

Below are the diagnostic scores and corresponding percentiles for 7th grade students taken between the beginning March 2nd and the end of the school year.

Percentile	Math	Reading
1 – 9	<=403 – 448	<=424 – 516
10 – 19	451 – 471	522 – 551
20 – 29	473 – 486	554 – 575
30 – 39	487 – 495	577 – 591
40 – 49	496 – 503	593 – 608
50 – 59	504 – 513	609 – 621
60 – 69	513 – 521	622 – 632
70 – 79	522 – 532	633 – 644
80 – 89	533 – 548	645 – 660
90 – 99	550 – 575+	662 – 695+

8th Grade

Fall

Below are the diagnostic scores and corresponding percentiles for 8th grade students taken between the beginning of the school year and November 15th.

Percentile	Math	Reading
1 – 9	<=406 – 447	<=431 – 518
10 – 19	450 – 469	523 – 550
20 – 29	471 – 483	555 – 573
30 – 39	484 – 492	575 – 589
40 – 49	493 – 500	591 – 605
50 – 59	501 – 509	607 – 619
60 – 69	510 – 517	620 – 631
70 – 79	518 – 527	632 – 641
80 – 89	529 – 543	642 – 660
90 – 99	545 – 572+	663 – 696+

Winter

Below are the diagnostic scores and corresponding percentiles for 8th grade students taken between the beginning November 16th and March 1st.

Percentile	Math	Reading
1 – 9	<=406 – 451	<=434 – 525
10 – 19	454 – 474	531 – 562
20 – 29	476 – 488	564 – 583
30 – 39	489 – 496	584 – 600
40 – 49	497 – 505	601 – 615
50 – 59	506 – 515	616 – 626
60 – 69	515 – 524	627 – 636
70 – 79	525 – 536	637 – 648
80 – 89	537 – 551	650 – 666
90 – 99	552 – 579+	669 – 704+

Spring

Below are the diagnostic scores and corresponding percentiles for 8th grade students taken between the beginning March 2nd and the end of the school year.

Percentile	Math	Reading
1 – 9	<407 – 453	<=434 – 529
10 – 19	457 – 478	535 – 567
20 – 29	480 – 491	569 – 589
30 – 39	492 – 500	590 – 607
40 – 49	501 – 511	609 – 621
50 – 59	512 – 521	622 – 632
60 – 69	522 – 531	633 – 642
70 – 79	532 – 542	643 – 654
80 – 89	544 – 556	655 – 669
90 – 99	558 – 585+	671 – 704+

Conclusion

We hope this guide has helped you get a better idea of what your child’s i-Ready Diagnostic score means and where they fall in the percentile range. For more detailed data, please check out the official i-Ready Diagnostic National Norms Tables for Reading and Mathematics resource.

Understanding i-Ready Diagnostic Scores & Percentiles | Mastery Genius (2024)

FAQs

What is a good percentile for iready diagnostic? ›

If they're in the 90th percentile, they performed as well or better than 90 percent of students. The Norms Tables also provide a range of scores for each grade level called the 'typical' range.

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How to understand IReady scores? ›

How to read your student's i-Ready Scores

The score uses our standard 4-point scale (seen on the right or below).
The score is based on the expectation for each topic at the time the test was taken.
A score of 3.00 or above, means the student is at or above the score expected on that test.

More items...

Read The Full Story ›

What score is 461 in an I-ready diagnostic? ›

For example, if your child has a scale score of 461, they would fall in the mid-on grade level category for first grade.

What grade is 500 in IReady? ›

The image above is an example of i-Ready diagnostics scores placement tables for 2023-2024 with descriptions of the colors. As seen in the image above, if a student in the third grade achieves a reading overall score of 500, this score falls within the 474-510 range, indicating a second-grade reading level.

Get More Info ›

Is 99th percentile good for Iready? ›

Those Talent Development Kindergarten students who scored at the 90th to 99th percentile on the NNAT3 and then hit at least the 90th percentile on the i-Ready mathematics assessment are then formally identified as Gifted learners.

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What is the highest iready diagnostic score ever? ›

i-Ready's diagnostic assessment provides a scaled score (ranges from 0 to 800) that can be tracked and compared across grades.

Learn More Now ›

How to explain IReady to parents? ›

Also, explain that i-Ready Diagnostic & Instruction will show teachers where your child is doing well and which topics need some more review. Encourage your child to use the tools provided during lessons (reference to objectives, key terms, etc.) and to use scrap paper for math computation.

What is the most difficult level in iready? ›

This is the highest i-Ready level since i-Ready instruction only goes up to 8th grade. Therefore, this is the most advanced level in i-Ready. Level H is in the last level in the middle school line.

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What is the iready grading scale? ›

Student performance is measured on a scale of 100–800, with your student's current score indicating the skills they have mastered up to that point in the school year and the skills they still need to work on moving forward.

Find Out More ›

Is 498 a good I-Ready diagnostic score? ›

Proficient for fifth grade is a mid on-grade level scale score of 498. The i-Ready Diagnostic is reported using a vertical scale that allows for comparing growth within and across years. Students receive a scale score each time they take the Diagnostic assessment.

Is 400 a good diagnostic score? ›

A student's diagnostic level represents their working grade level. So a level of 400 represents a readiness to start working on 4th-grade skills, and a level of 450 means the student is about halfway through the 4th-grade curriculum.

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What is a good I-ready diagnostic score for 12th grade? ›

iReady Math Diagnostic Scores 2024

Grade	Fall Exam	Spring Exam
Grade 9	515 – 555	586 – 598
Grade 10	556 – 585	599 – 610
Grade 11	564 – 589	611 – 629
Grade 12	572 – 601	630 – 800

9 more rows

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Is level G in i-Ready 7th grade? ›

Level G is a level that appears in some i-Ready Reading and Math lessons. Level G is equivalent to 7th Grade in the U.S. In these i-Ready lessons, many characters appear.

Keep Reading ›

What level is 5th grade in i-Ready? ›

Level E is a level in i-Ready. Level E is 5th grade. Multiple characters such as Azul, G.O, and Olive appear in Level E. Level E is the last level in the Elementary School line.

Understanding i-Ready Diagnostic Scores & Percentiles | Mastery Genius (2024)

i-Ready Diagnostic Scores & Percentiles by Grade

Kindergarten

Fall

Winter

Spring

1st Grade

Fall

Winter

Spring

2nd Grade

Fall

Winter

Spring

3rd Grade

Fall

Winter

Spring

4th Grade

Fall

Winter

Spring

5th Grade

Fall

Winter

Spring

6th Grade

Fall

Winter

Spring

7th Grade

Fall

Winter

Spring

8th Grade

Fall

Winter

Spring

Conclusion

FAQs

What is a good percentile for iready diagnostic? ›

Is 400 a good diagnostic score? ›