CFI FYI

Weight

Pressure Altitude

Temperature

Headwind (enter negative for tailwind)

Runway Surface

Paved
Dry Grass

Ground Roll: 992 feet

50 Foot Obstacle Distance: 1690 feet

Ground Roll Figures

Ground Roll Distance at 2550 Pounds
Pressure Alt. (feet)	0°C	10°C	20°C	30°C	40°C
0	860	925	995	1070	1150
1000	940	1010	1090	1170	1260
2000	1025	1110	1195	1285	1380
3000	1125	1215	1310	1410	1515
4000	1235	1335	1440	1550	1660
5000	1355	1465	1585	1705	1825
6000	1495	1615	1745	1875	2010
7000	1645	1785	1920	2065	2215
8000	1820	1970	2120	2280	2450

Ground Roll Distance at 2400 Pounds
Pressure Alt. (feet)	0°C	10°C	20°C	30°C	40°C
0	745	800	860	925	995
1000	810	875	940	1010	1085
2000	885	955	1030	1110	1190
3000	970	1050	1130	1215	1305
4000	1065	1150	1240	1335	1430
5000	1170	1265	1360	1465	1570
6000	1285	1390	1500	1610	1725
7000	1415	1530	1650	1770	1900
8000	1560	1690	1815	1950	2095

Ground Roll Distance at 2200 Pounds
Pressure Alt. (feet)	0°C	10°C	20°C	30°C	40°C
0	610	655	705	760	815
1000	665	720	770	830	890
2000	725	785	845	905	975
3000	795	860	925	995	1065
4000	870	940	1010	1090	1165
5000	955	1030	1110	1195	1275
6000	1050	1130	1220	1310	1400
7000	1150	1245	1340	1435	1540
8000	1270	1370	1475	1580	1695

Total Distance Figures

Total Distance Over 50 Foot Obstacle at 2550 Pounds
Pressure Alt. (feet)	0°C	10°C	20°C	30°C	40°C
0	1465	1575	1690	1810	1945
1000	1600	1720	1850	1990	2135
2000	1755	1890	2035	2190	2355
3000	1925	2080	2240	2420	2605
4000	2120	2295	2480	2685	2880
5000	2345	2545	2755	2975	3205
6000	2605	2830	3075	3320	3585
7000	2910	3170	3440	3730	4045
8000	3265	3575	3880	4225	4615

Total Distance Over 50 Foot Obstacle at 2400 Pounds
Pressure Alt. (feet)	0°C	10°C	20°C	30°C	40°C
0	1275	1370	1470	1570	1685
1000	1390	1495	1605	1720	1845
2000	1520	1635	1760	1890	2030
3000	1665	1795	1930	2080	2230
4000	1830	1975	2130	2295	2455
5000	2015	2180	2355	2530	2715
6000	2230	2410	2610	2805	3015
7000	2470	2685	2900	3125	3370
8000	2755	3000	3240	3500	3790

Total Distance Over 50 Foot Obstacle at 2200 Pounds
Pressure Alt. (feet)	0°C	10°C	20°C	30°C	40°C
0	1055	1130	1205	1290	1380
1000	1145	1230	1315	1410	1505
2000	1250	1340	1435	1540	1650
3000	1365	1465	1570	1685	1805
4000	1490	1605	1725	1855	1975
5000	1635	1765	1900	2035	2175
6000	1800	1940	2090	2240	2395
7000	1985	2145	2305	2475	2650
8000	2195	2375	2555	2745	2950

Explanation of Calculation

This calculator uses data from the Cessna 172S POH, which assumes flaps set at 10 degrees, full throttle applied prior to brake release, a paved, level, and dry runway, and zero wind.

First, data is interpolated from the weight, temperature, and pressure numbers given.

Next, headwind and tailwind is used to modify the previous calculations. For this calculator, distances are decreased by 10% for each 9 knots of headwind, and distances are increased by 10% for each 2 knots of tailwind.

Finally, if a grass runway is selected, the ground roll is increased by 15%, and that increase is then added into the total value.

Disclaimer

This calculator is intended to be used for demonstration purposes only to aid in understanding how takeoff and landing calculations are made. This calculator should never be used as a replacement to required performance calculations.