Cessna 172S Weight and Balance Calculator
Cessna 172S historical N21767 historical example: empty weight 1718.2 lb at 41.07 in. Fuel arm 48 in; front 37, rear 73, baggage 95 in. Forward CG interpolates from 35 to 41 inches above 1950 lb; maximum 2550 lb. These records must not replace your aircraft's approved POH.
Cessna 172S Weight and Balance Calculator reference last updated · reference source
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Dated static reference; no live data is fetched. Verify current source values and assumptions before relying on results.
What this tool does
Cessna 172S historical N21767 historical example: empty weight 1718.2 lb at 41.07 in. Fuel arm 48 in; front 37, rear 73, baggage 95 in. Forward CG interpolates from 35 to 41 inches above 1950 lb; maximum 2550 lb. These records must not replace your aircraft's approved POH.
How to use the Cessna 172S Weight and Balance Calculator
- Check Stations: name, weight lb, moment arm inches (one per line): Empty aircraft (N21767 historical example),1718.2,41.07 Front occupants,340,37 Rear occupants,0,73 Baggage,20,95.
- Check Fuel onboard (US gallons): 30.
- Check Fuel density (lb/US gallon): 6.
- Check Fuel moment arm (inches): 48.
- Check Entered minimum CG (inches): 35.
- Check Entered maximum CG (inches): 47.3.
- Check Entered maximum weight (lb): 2550.
- Review the Cessna 172S Weight and Balance Calculator result and its exact-value comparison table.
- Verify assumptions before applying the result.
Formula
weight=sum station weights+fuel gallons×density; moment=sum(weight×arm); CG=total moment/total weight
- stations
- Stations: name, weight lb, moment arm inches (one per line)
- fuel
- Fuel onboard (US gallons)
- density
- Fuel density (lb/US gallon)
- arm
- Fuel moment arm (inches)
- minCg
- Entered minimum CG (inches)
- maxCg
- Entered maximum CG (inches)
- maxWeight
- Entered maximum weight (lb)
Generic editable example, NOT aircraft-certified data. Real CG envelopes often vary with weight; entered rectangular limits do not model a full envelope.
Worked example
Cessna 172S Weight and Balance Calculator: Stations: name, weight lb, moment arm inches (one per line) = Empty aircraft (N21767 historical example),1718.2,41.07 Front occupants,340,37 Rear occupants,0,73 Baggage,20,95; Fuel onboard (US gallons) = 30; Fuel density (lb/US gallon) = 6; Fuel moment arm (inches) = 48; Entered minimum CG (inches) = 35; Entered maximum CG (inches) = 47.3; Entered maximum weight (lb) = 2550. Cessna 172S historical N21767 historical example: empty weight 1718.2 lb at 41.07 in. Fuel arm 48 in; front 37, rear 73, baggage 95 in. Forward CG interpolates from 35 to 41 inches above 1950 lb; maximum 2550 lb. These records must not replace your aircraft's approved POH.
Inputs
- Stations: name, weight lb, moment arm inches (one per line)Empty aircraft (N21767 historical example),1718.2,41.07 Front occupants,340,37 Rear occupants,0,73 Baggage,20,95
- Fuel onboard (US gallons)30
- Fuel density (lb/US gallon)6
- Fuel moment arm (inches)48
- Entered minimum CG (inches)35
- Entered maximum CG (inches)47.3
- Entered maximum weight (lb)2550
Result
- Within reference envelope?Within reference limits — verify current aircraft POH
- Total weight (lb)2,258.2
- Total moment (lb-in)93,686.47
- Center of gravity (inches)41.49
- Weight-dependent forward CG limit (inches)38.08
Cessna 172S reference stations and envelope
| Reference | Value |
|---|---|
| Record | N21767 historical example |
| Empty weight lb | 1718.2 |
| Empty arm in | 41.07 |
| Front seats arm in | 37 |
| Rear seats arm in | 73 |
| Fuel arm in | 48 |
| Baggage arm in | 95 |
| Maximum weight lb | 2550 |
| Aft CG in | 47.3 |
Results explained
- Within entered rectangular limits?
- Within entered rectangular limits? from the formula above. Generic editable example, NOT aircraft-certified data. Real CG envelopes often vary with weight; entered rectangular limits do not model a full envelope.
- Total weight (lb)
- Total weight (lb) from the formula above. Generic editable example, NOT aircraft-certified data. Real CG envelopes often vary with weight; entered rectangular limits do not model a full envelope.
- Total moment (lb-in)
- Total moment (lb-in) from the formula above. Generic editable example, NOT aircraft-certified data. Real CG envelopes often vary with weight; entered rectangular limits do not model a full envelope.
- Center of gravity (inches)
- Center of gravity (inches) from the formula above. Generic editable example, NOT aircraft-certified data. Real CG envelopes often vary with weight; entered rectangular limits do not model a full envelope.
Frequently asked questions
Historical N21767 historical example: 1718.2 lb, CG 41.07 inches; replace with current aircraft records.
At arm 48 inches; 30 US gallons at entered 6 lb/gal adds 180 lb and 8640 lb-in.
2550 lb normal-category takeoff reference; verify the actual model and serial number.
Yes. 35 inches up to 1950 lb, linearly to 41 inches at 2550 lb. Aft limit 47.3 inches.
No. This historical training reference is not flight authorization. Use current approved loading records, full POH limitations, seat positions, fuel and performance checks before flight.