{"chart":"standard-atmosphere-chart","generatedFrom":"All Unit Conversions shared conversion library","tables":[{"title":"Standard atmosphere by altitude in feet","headers":["Altitude (ft)","Metres","Temp. (°C)","Temp. (°F)","Pressure (hPa)","Pressure (inHg)","Density ratio σ","Speed of sound (kt)"],"rows":[["−1,000","−305","17.0","62.6","1,050.41","31.02","1.0296","663.7"],["0","0","15.0","59.0","1,013.25","29.92","1.0000","661.5"],["1,000","305","13.0","55.4","977.17","28.86","0.9711","659.2"],["2,000","610","11.0","51.9","942.13","27.82","0.9428","656.9"],["3,000","914","9.1","48.3","908.12","26.82","0.9151","654.6"],["4,000","1,219","7.1","44.7","875.11","25.84","0.8881","652.3"],["5,000","1,524","5.1","41.2","843.07","24.90","0.8617","650.0"],["6,000","1,829","3.1","37.6","812.00","23.98","0.8359","647.7"],["7,000","2,134","1.1","34.0","781.85","23.09","0.8106","645.4"],["8,000","2,438","−0.8","30.5","752.62","22.22","0.7860","643.0"],["9,000","2,743","−2.8","26.9","724.28","21.39","0.7620","640.7"],["10,000","3,048","−4.8","23.3","696.82","20.58","0.7385","638.3"],["11,000","3,353","−6.8","19.8","670.20","19.79","0.7156","636.0"],["12,000","3,658","−8.8","16.2","644.41","19.03","0.6932","633.6"],["13,000","3,962","−10.8","12.6","619.43","18.29","0.6713","631.2"],["14,000","4,267","−12.7","9.1","595.24","17.58","0.6500","628.8"],["15,000","4,572","−14.7","5.5","571.82","16.89","0.6292","626.4"],["16,000","4,877","−16.7","1.9","549.15","16.22","0.6090","624.0"],["17,000","5,182","−18.7","−1.6","527.22","15.57","0.5892","621.6"],["18,000","5,486","−20.7","−5.2","506.00","14.94","0.5699","619.2"],["19,000","5,791","−22.6","−8.8","485.48","14.34","0.5511","616.8"],["20,000","6,096","−24.6","−12.3","465.63","13.75","0.5328","614.3"],["21,000","6,401","−26.6","−15.9","446.45","13.18","0.5150","611.9"],["22,000","6,706","−28.6","−19.5","427.91","12.64","0.4976","609.4"],["23,000","7,010","−30.6","−23.0","410.01","12.11","0.4807","606.9"],["24,000","7,315","−32.5","−26.6","392.71","11.60","0.4642","604.4"],["25,000","7,620","−34.5","−30.2","376.01","11.10","0.4481","601.9"],["26,000","7,925","−36.5","−33.7","359.89","10.63","0.4325","599.4"],["27,000","8,230","−38.5","−37.3","344.33","10.17","0.4173","596.9"],["28,000","8,534","−40.5","−40.9","329.32","9.72","0.4025","594.4"],["29,000","8,839","−42.5","−44.4","314.85","9.30","0.3881","591.9"],["30,000","9,144","−44.4","−48.0","300.90","8.89","0.3741","589.3"],["31,000","9,449","−46.4","−51.6","287.45","8.49","0.3605","586.8"],["32,000","9,754","−48.4","−55.1","274.49","8.11","0.3473","584.2"],["33,000","10,058","−50.4","−58.7","262.01","7.74","0.3345","581.6"],["34,000","10,363","−52.4","−62.2","249.99","7.38","0.3220","579.0"],["35,000","10,668","−54.3","−65.8","238.42","7.04","0.3099","576.4"],["36,000","10,973","−56.3","−69.4","227.29","6.71","0.2981","573.8"],["37,000","11,278","−56.5","−69.7","216.63","6.40","0.2844","573.6"],["38,000","11,582","−56.5","−69.7","206.46","6.10","0.2710","573.6"],["39,000","11,887","−56.5","−69.7","196.77","5.81","0.2583","573.6"],["40,000","12,192","−56.5","−69.7","187.54","5.54","0.2462","573.6"],["41,000","12,497","−56.5","−69.7","178.74","5.28","0.2346","573.6"],["42,000","12,802","−56.5","−69.7","170.35","5.03","0.2236","573.6"],["43,000","13,106","−56.5","−69.7","162.36","4.79","0.2131","573.6"],["44,000","13,411","−56.5","−69.7","154.74","4.57","0.2031","573.6"],["45,000","13,716","−56.5","−69.7","147.48","4.35","0.1936","573.6"],["50,000","15,240","−56.5","−69.7","115.97","3.42","0.1522","573.6"],["55,000","16,764","−56.5","−69.7","91.20","2.69","0.1197","573.6"],["60,000","18,288","−56.5","−69.7","71.72","2.12","0.0941","573.6"],["65,000","19,812","−56.5","−69.7","56.40","1.67","0.0740","573.6"]]},{"title":"Standard atmosphere by altitude in metres","headers":["Altitude (m)","Feet","Temp. (°C)","Pressure (hPa)","Density (kg/m³)","Density ratio σ","Speed of sound (m/s)"],"rows":[["0","0","15.00","1,013.3","1.225","1.0000","340.3"],["500","1,640","11.75","954.61","1.167","0.9529","338.4"],["1,000","3,281","8.50","898.75","1.112","0.9075","336.4"],["1,500","4,921","5.25","845.56","1.058","0.8637","334.5"],["2,000","6,562","2.00","794.95","1.006","0.8216","332.5"],["2,500","8,202","−1.25","746.83","0.9569","0.7811","330.6"],["3,000","9,843","−4.50","701.09","0.9091","0.7421","328.6"],["3,500","11,483","−7.75","657.64","0.8632","0.7047","326.6"],["4,000","13,123","−11.00","616.40","0.8191","0.6687","324.6"],["4,500","14,764","−14.25","577.28","0.7768","0.6341","322.6"],["5,000","16,404","−17.50","540.20","0.7361","0.6009","320.5"],["5,500","18,045","−20.75","505.07","0.6971","0.5691","318.5"],["6,000","19,685","−24.00","471.81","0.6597","0.5385","316.4"],["6,500","21,325","−27.25","440.35","0.6238","0.5093","314.4"],["7,000","22,966","−30.50","410.61","0.5895","0.4812","312.3"],["7,500","24,606","−33.75","382.51","0.5566","0.4544","310.2"],["8,000","26,247","−37.00","356.00","0.5252","0.4287","308.1"],["8,500","27,887","−40.25","330.99","0.4951","0.4042","305.9"],["9,000","29,528","−43.50","307.42","0.4663","0.3807","303.8"],["9,500","31,168","−46.75","285.24","0.4389","0.3583","301.6"],["10,000","32,808","−50.00","264.36","0.4127","0.3369","299.5"],["10,500","34,449","−53.25","244.74","0.3877","0.3165","297.3"],["11,000","36,089","−56.50","226.32","0.3639","0.2971","295.1"],["11,500","37,730","−56.50","209.16","0.3363","0.2746","295.1"],["12,000","39,370","−56.50","193.30","0.3108","0.2537","295.1"],["12,500","41,010","−56.50","178.65","0.2873","0.2345","295.1"],["13,000","42,651","−56.50","165.10","0.2655","0.2167","295.1"],["13,500","44,291","−56.50","152.59","0.2454","0.2003","295.1"],["14,000","45,932","−56.50","141.02","0.2268","0.1851","295.1"],["14,500","47,572","−56.50","130.33","0.2096","0.1711","295.1"],["15,000","49,213","−56.50","120.45","0.1937","0.1581","295.1"],["15,500","50,853","−56.50","111.31","0.1790","0.1461","295.1"],["16,000","52,493","−56.50","102.87","0.1654","0.1350","295.1"],["16,500","54,134","−56.50","95.075","0.1529","0.1248","295.1"],["17,000","55,774","−56.50","87.867","0.1413","0.1153","295.1"],["17,500","57,415","−56.50","81.205","0.1306","0.1066","295.1"],["18,000","59,055","−56.50","75.048","0.1207","0.0985","295.1"],["18,500","60,696","−56.50","69.358","0.1115","0.0910","295.1"],["19,000","62,336","−56.50","64.100","0.1031","0.0841","295.1"],["19,500","63,976","−56.50","59.240","0.09526","0.0778","295.1"],["20,000","65,617","−56.50","54.749","0.08803","0.0719","295.1"]]},{"title":"Density altitude (feet) from pressure altitude and temperature","headers":["Pressure alt. (ft)","−10 °C","0 °C","10 °C","20 °C","30 °C","40 °C"],"rows":[["0","−3,130","−1,840","−600","590","1,720","2,820"],["1,000","−1,870","−590","640","1,820","2,940","4,030"],["2,000","−620","660","1,880","3,040","4,160","5,230"],["3,000","640","1,900","3,110","4,270","5,380","6,440"],["4,000","1,900","3,150","4,340","5,490","6,590","7,640"],["5,000","3,150","4,390","5,580","6,710","7,800","8,850"],["6,000","4,400","5,630","6,800","7,930","9,010","10,050"],["7,000","5,650","6,870","8,030","9,150","10,220","11,240"],["8,000","6,890","8,100","9,260","10,360","11,420","12,440"],["9,000","8,140","9,330","10,480","11,570","12,630","13,630"],["10,000","9,380","10,560","11,700","12,790","13,830","14,830"],["11,000","10,620","11,790","12,920","13,990","15,030","16,020"],["12,000","11,850","13,020","14,130","15,200","16,220","17,200"]]},{"title":"ISA constants and formulas","headers":["Quantity","Value or formula"],"rows":[["Sea-level temperature","288.15 K (15 °C, 59 °F)"],["Sea-level pressure","101,325 Pa = 1013.25 hPa = 29.921 inHg = 14.696 psi"],["Sea-level density","1.225 kg/m³ (0.002377 slug/ft³)"],["Lapse rate","6.5 K per km (1.98 °C per 1,000 ft) up to 11 km (36,089 ft)"],["Tropopause to 20 km","Constant 216.65 K (−56.5 °C); p = 22,632 Pa × e^(−(h − 11,000) ÷ 6,341.6 m)"],["Speed of sound","a = √(1.4 × 287.053 × T);  340.29 m/s = 661.5 kt at sea level"],["ISA deviation","ISA temperature at altitude: 15 − 1.98 × (altitude ÷ 1,000 ft) °C"]]}]}