What this calculator does
This flight logbook calculator adds one flight's entered time to your existing totals. It updates total flight time and separately entered categories for pilot in command (PIC), second in command (SIC), solo, dual received, cross-country, night, actual instrument, and simulated instrument time.
The calculator performs addition only. It does not decide whether a flight qualifies for a particular category, determine whether a record meets a regulatory requirement, or replace your official logbook.
How to use the calculator
For each category, enter the current total from your logbook and the time you intend to add for this flight. Use decimal hours, such as 1.4 for one hour and 24 minutes if that is how your source record represents the time. Enter zero for a category that does not apply.
The updated totals recalculate as you edit the fields. The inputs are encoded in the page URL so you can reopen a calculation or share it. The URL may reveal logbook totals, so remove its query string before sharing if the figures are private. Use Download CSV to save an ungated copy of the current totals.
Understanding the categories
The category fields are independent. Some time can appear in more than one category, so category totals are not added together to create total flight time. Enter only the amounts already recorded or otherwise determined for each category. This calculator does not classify a flight or infer category time from total time.
Use the same definitions and recording method as your existing logbook. In particular, do not assume that a flight qualifies as PIC, cross-country, night, or instrument time merely because the calculator has a field for it.
How the calculation works
For each row, the calculator rounds the current total and the new flight value to the nearest hundredth of an hour, then adds them:
updated category total = current category total + this flight's category time
For example, an existing total of 125.30 hr plus a flight entry of 1.40 hr produces 126.70 hr. Each category is calculated separately. No flight duration or category allocation is inferred from another field.
Worked example
Suppose your current totals show 125.30 hr total time and 110.50 hr PIC. You enter a new flight as 1.40 hr total and 1.40 hr PIC. The updated values are 126.70 hr total and 111.90 hr PIC. If your records also support adding time to another category, enter that amount in its own flight field. Nothing is copied automatically between categories.
Practical use
This tool is useful when transferring a paper entry into a running summary, checking the arithmetic on a new entry, or maintaining a separate total for a training goal. Compare each result with your own source records before changing an official logbook.
If your logbook stores hours and minutes rather than decimal hours, convert the time using your normal recordkeeping method before entering it. For instance, 24 minutes is 0.40 decimal hours, not 0.24 hours. The calculator does not convert clock times or minutes.
Assumptions and limitations
The calculator assumes that all entered values are non-negative decimal hours and rounds each value to two decimal places before addition. It accepts values up to 100,000 hours to reject malformed or accidental inputs, not to state a logging limit.
Your logbook remains the record of flight experience. Check the current requirements and category definitions in 14 CFR 61.51 and applicable FAA guidance. The calculator does not establish that an entry satisfies those requirements.
Frequently asked questions
Does the calculator save my logbook?
No. It calculates from the values currently in the fields and provides a CSV download. The tool does not create an account or maintain a separate flight-by-flight log.
Why can my category totals add up to more than total flight time?
Categories such as PIC, cross-country, night, and instrument describe different attributes of logged time and may overlap. They are shown as separate running totals, not as parts that must sum to total flight time.
Can I enter hours and minutes?
Enter decimal hours. Convert minutes to a fraction of an hour first. For example, 30 minutes is 0.50 hours.
Is the result an official logbook entry?
No. It is an arithmetic aid. Review the entry and applicable logging requirements, then record it in your official logbook using the definitions and evidence that apply to your flight.
Sources and methodology
The calculation is direct addition with rounding to hundredths of an hour. The calculator does not encode regulatory eligibility rules. For current logging requirements, consult 14 CFR 61.51 and current FAA publications.
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