Z and T Distribution Tables

Standard Normal (Z) Table

Extreme Z-Value Calculator (|Z| > 3.4)
For Z-values beyond ±3.9 (not in table), this computes P(Z ≤ z) using numerical approximation.
Note: For |Z| ≤ 3.9, use the table below.
Z .00.01.02.03.04.05.06.07.08.09
-3.9.00005.00005.00004.00004.00004.00004.00004.00004.00003.00003
-3.8.00007.00007.00007.00006.00006.00006.00006.00005.00005.00005
-3.7.00011.00010.00010.00010.00009.00009.00008.00008.00008.00008
-3.6.00016.00015.00015.00014.00014.00013.00013.00012.00012.00011
-3.5.00023.00022.00022.00021.00020.00019.00019.00018.00017.00017
-3.4.00034.00032.00031.00030.00029.00028.00027.00026.00025.00024
-3.3.00048.00047.00045.00043.00042.00040.00039.00038.00036.00035
-3.2.00069.00066.00064.00062.00060.00058.00056.00054.00052.00050
-3.1.00097.00094.00090.00087.00084.00082.00079.00076.00074.00071
-3.0.00135.00131.00126.00122.00118.00114.00111.00107.00104.00100
-2.9.00187.00181.00175.00169.00164.00159.00154.00149.00144.00139
-2.8.00256.00248.00240.00233.00226.00219.00212.00205.00199.00193
-2.7.00347.00336.00326.00317.00307.00298.00289.00280.00272.00264
-2.6.00466.00453.00440.00427.00415.00402.00391.00379.00368.00357
-2.5.00621.00604.00587.00570.00554.00539.00523.00508.00494.00480
-2.4.00820.00798.00776.00755.00734.00714.00695.00676.00657.00639
-2.3.01072.01044.01017.00990.00964.00939.00914.00889.00866.00842
-2.2.01390.01355.01321.01287.01255.01222.01191.01160.01130.01101
-2.1.01786.01743.01700.01659.01618.01578.01539.01500.01463.01426
-2.0.02275.02222.02169.02118.02068.02018.01970.01923.01876.01831
-1.9.02872.02807.02743.02680.02619.02559.02500.02442.02385.02330
-1.8.03593.03515.03438.03362.03288.03216.03144.03074.03005.02938
-1.7.04457.04363.04272.04182.04093.04006.03920.03836.03754.03673
-1.6.05480.05370.05262.05155.05050.04947.04846.04746.04648.04551
-1.5.06681.06552.06426.06301.06178.06057.05938.05821.05705.05592
-1.4.08076.07927.07780.07636.07493.07353.07215.07078.06944.06811
-1.3.09680.09510.09342.09176.09012.08851.08691.08534.08379.08226
-1.2.11507.11314.11123.10935.10749.10565.10383.10204.10027.09853
-1.1.13567.13350.13136.12924.12714.12507.12302.12100.11900.11702
-1.0.15866.15625.15386.15151.14917.14686.14457.14231.14007.13786
-0.9.18406.18141.17879.17619.17361.17106.16853.16602.16354.16109
-0.8.21186.20897.20611.20327.20045.19766.19489.19215.18943.18673
-0.7.24196.23885.23576.23270.22965.22663.22363.22065.21770.21476
-0.6.27425.27093.26763.26435.26109.25785.25463.25143.24825.24510
-0.5.30854.30503.30153.29806.29460.29116.28774.28434.28096.27760
-0.4.34458.34090.33724.33360.32997.32636.32276.31918.31561.31207
-0.3.38209.37828.37448.37070.36693.36317.35942.35569.35197.34827
-0.2.42074.41683.41294.40905.40517.40129.39743.39358.38974.38591
-0.1.46017.45620.45224.44828.44433.44038.43644.43251.42858.42465
-0.0.50000.49601.49202.48803.48405.48006.47608.47210.46812.46414
0.0.50000.50399.50798.51197.51595.51994.52392.52790.53188.53586
0.1.53983.54380.54776.55172.55567.55962.56356.56749.57142.57535
0.2.57926.58317.58706.59095.59483.59871.60257.60642.61026.61409
0.3.61791.62172.62552.62930.63307.63683.64058.64431.64803.65173
0.4.65542.65910.66276.66640.67003.67364.67724.68082.68439.68793
0.5.69146.69497.69847.70194.70540.70884.71226.71566.71904.72240
0.6.72575.72907.73237.73565.73891.74215.74537.74857.75175.75490
0.7.75804.76115.76424.76730.77035.77337.77637.77935.78230.78524
0.8.78814.79103.79389.79673.79955.80234.80511.80785.81057.81327
0.9.81594.81859.82121.82381.82639.82894.83147.83398.83646.83891
1.0.84134.84375.84614.84849.85083.85314.85543.85769.85993.86214
1.1.86433.86650.86864.87076.87286.87493.87698.87900.88100.88298
1.2.88493.88686.88877.89065.89251.89435.89617.89796.89973.90147
1.3.90320.90490.90658.90824.90988.91149.91309.91466.91621.91774
1.4.91924.92073.92220.92364.92507.92647.92785.92922.93056.93189
1.5.93319.93448.93574.93699.93822.93943.94062.94179.94295.94408
1.6.94520.94630.94738.94845.94950.95053.95154.95254.95352.95449
1.7.95543.95637.95728.95818.95907.95994.96080.96164.96246.96327
1.8.96407.96485.96562.96638.96712.96784.96856.96926.96995.97062
1.9.97128.97193.97257.97320.97381.97441.97500.97558.97615.97670
2.0.97725.97778.97831.97882.97932.97982.98030.98077.98124.98169
2.1.98214.98257.98300.98341.98382.98422.98461.98500.98537.98574
2.2.98610.98645.98679.98713.98745.98778.98809.98840.98870.98899
2.3.98928.98956.98983.99010.99036.99061.99086.99111.99134.99158
2.4.99180.99202.99224.99245.99266.99286.99305.99324.99343.99361
2.5.99379.99396.99413.99430.99446.99461.99477.99492.99506.99520
2.6.99534.99547.99560.99573.99585.99598.99609.99621.99632.99643
2.7.99653.99664.99674.99683.99693.99702.99711.99720.99728.99736
2.8.99744.99752.99760.99767.99774.99781.99788.99795.99801.99807
2.9.99813.99819.99825.99831.99836.99841.99846.99851.99856.99861
3.0.99865.99869.99874.99878.99882.99886.99889.99893.99896.99900
3.1.99903.99906.99910.99913.99916.99918.99921.99924.99926.99929
3.2.99931.99934.99936.99938.99940.99942.99944.99946.99948.99950
3.3.99952.99953.99955.99957.99958.99960.99961.99962.99964.99965
3.4.99966.99968.99969.99970.99971.99972.99973.99974.99975.99976
3.5.99977.99978.99978.99979.99980.99981.99981.99982.99983.99983
3.6.99984.99985.99985.99986.99986.99987.99987.99988.99988.99989
3.7.99989.99990.99990.99990.99991.99991.99992.99992.99992.99992
3.8.99993.99993.99993.99994.99994.99994.99994.99995.99995.99995
3.9.99995.99995.99996.99996.99996.99996.99996.99996.99997.99997

Student's t Table

Confidence Levels: 50% to 99.9%
df t.50t.75t.80t.85t.90t.95t.975t.99t.995t.999t.9995
50%60%70%80%90%95%97.5%99%99.5%99.8%99.9%
10.0001.0001.3761.9633.0786.31412.7131.8263.66318.31636.62
20.0000.8161.0611.3861.8862.9204.3036.9659.92522.32731.599
30.0000.7650.9781.2501.6382.3533.1824.5415.84110.21512.924
40.0000.7410.9411.1901.5332.1322.7763.7474.6047.1738.610
50.0000.7270.9201.1561.4762.0152.5713.3654.0325.8936.869
60.0000.7180.9061.1341.4401.9432.4473.1433.7075.2085.959
70.0000.7110.8961.1191.4151.8952.3652.9983.4994.7855.408
80.0000.7060.8891.1081.3971.8602.3062.8963.3554.5015.041
90.0000.7030.8831.1001.3831.8332.2622.8213.2504.2974.781
100.0000.7000.8791.0931.3721.8122.2282.7643.1694.1444.587
110.0000.6970.8761.0881.3631.7962.2012.7183.1064.0254.437
120.0000.6950.8731.0831.3561.7822.1792.6813.0553.9304.318
130.0000.6940.8701.0791.3501.7712.1602.6503.0123.8524.221
140.0000.6920.8681.0761.3451.7612.1452.6242.9773.7874.140
150.0000.6910.8661.0741.3411.7532.1312.6022.9473.7334.073
160.0000.6900.8651.0711.3371.7462.1202.5832.9213.6864.015
170.0000.6890.8631.0691.3331.7402.1102.5672.8983.6463.965
180.0000.6880.8621.0671.3301.7342.1012.5522.8783.6103.922
190.0000.6880.8611.0661.3281.7292.0932.5392.8613.5793.883
200.0000.6870.8601.0641.3251.7252.0862.5282.8453.5523.850
210.0000.6860.8591.0631.3231.7212.0802.5182.8313.5273.819
220.0000.6860.8581.0611.3211.7172.0742.5082.8193.5053.792
230.0000.6850.8581.0601.3191.7142.0692.5002.8073.4853.768
240.0000.6850.8571.0591.3181.7112.0642.4922.7973.4673.745
250.0000.6840.8561.0581.3161.7082.0602.4852.7873.4503.725
260.0000.6840.8561.0581.3151.7062.0562.4792.7793.4353.707
270.0000.6840.8551.0571.3141.7032.0522.4732.7713.4213.690
280.0000.6830.8551.0561.3131.7012.0482.4672.7633.4083.674
290.0000.6830.8541.0551.3111.6992.0452.4622.7563.3963.659
300.0000.6830.8541.0551.3101.6972.0422.4572.7503.3853.646
400.0000.6810.8511.0501.3031.6842.0212.4232.7043.3073.551
600.0000.6790.8481.0451.2961.6712.0002.3902.6603.2323.460
800.0000.6780.8461.0431.2921.6641.9902.3742.6393.1953.416
1000.0000.6770.8451.0421.2901.6601.9842.3642.6263.1743.390
10000.0000.6750.8421.0371.2821.6461.9622.3302.5813.0983.300
z0.0000.6740.8421.0361.2821.6451.9602.3262.5763.0903.291
© 2025 Attila Asghari — Computer Engineer
This resource is free and open for educational use.
Contact: attilaasghari@gmail.com
Website: https://ata.vitren.ir