Seven daily totals against the live target band and rolling meanLive current inputs
Health & Fitness
Protein Intake Trend Calculator
Analyze seven daily protein totals against a live target band, quantify slope and variability, count in-range days, and separate a consistent pattern from a misleading one-day high.
Seven-day average—
Seven-day total—
Daily trend slope—
Day-to-day variability—
Days meeting lower target—
Lowest-intake day—
Average gap to target—
Consistency interpretation—
Protein intake control chart
Seven daily totals against the live target band and rolling mean
Daily points, a target zone, mean line, and least-squares trend distinguish consistency from a late-week catch-up pattern.
Daily intake audit
Day-level target gaps and contribution to the weekly pattern
The table makes low days visible even when the weekly average appears acceptable.
| Day | Protein | Gap to lower target | Target met | Share of weekly total | Three-day rolling mean |
|---|
Trend setup
Enter a complete representative week
- Use daily totals from the same tracking method.
- Enter the lower bound of the chosen target range.
- Include rest days and weekends.
- Avoid replacing missing days with a typical estimate.
- Interpret the mean together with variability and target-day count.
Consistency logic
A weekly average can hide an unstable intake pattern
Two weeks can share the same average while one meets the target every day and the other alternates between very low and very high intake. The control chart makes that difference visible.
A seven-day slope is descriptive, not a forecast. It may reflect meal preparation, schedule, reporting error, or a deliberate transition.
Calculation method
Summarize level, direction, and consistency separately
The mean describes average intake, standard deviation describes day-to-day spread, and least-squares slope describes direction. Target-day count prevents a high average from hiding repeated low days.
Detailed calculation process and general formulas
Mean = sum(P_i) / 7SD = sqrt(sum((P_i - Mean)^2) / 7)Slope = sum((i-i_bar)(P_i-Mean)) / sum((i-i_bar)^2)Days_met = count(P_i >= Target)Mean_gap = max(Target - Mean, 0)Symbols, meanings, and units
- P_i
- protein intake on day ig/day
- Mean, SD
- weekly mean and population standard deviationg/day
- i, i_bar
- day index and mean day indexdimensionless
- Slope
- least-squares change across the weekg/day per day
- Target, Days_met
- lower daily target and count meeting itg/day; days
Pattern diagnosis
Four views of the same seven-day record
Level, total exposure, variability, and target frequency answer different questions.
Average level
—Mean daily intake across all seven days.
Consistency
—Population standard deviation of daily intake.
Target frequency
—Number of days at or above the lower bound.
Direction
—Least-squares slope across the entered week.
Decision takeaway: Improve the recurring low days before using one large day to raise the weekly average.
Trend review
Questions to ask after the chart
- Were low days rest days or tracking gaps?
- Did meal preparation differ by day?
- Was total energy unusually low?
- Did training timing change intake?
- Is the week representative of normal behavior?
Tracking evidence
Records that make the trend useful
- Food-log timestamps
- Serving weights
- Recipe ingredients
- Supplement labels
- Training and travel calendar
Practical applications
Decisions this calculator is designed to support
Weekend intake collapse
Weekday intake meets the target but weekend totals fall sharply.
What the result clarifies: Target-day count and the line chart identify the schedule problem hidden by the mean.
Gradual meal-prep improvement
Daily totals rise steadily after a new breakfast routine.
What the result clarifies: A positive slope describes the transition while variability shows whether it is stable yet.
Worked example
Current-input substitution and reconciliation
Model limitations
This calculator analyzes entered intake data; it does not determine an appropriate medical target or validate tracking accuracy. Seven days may not represent long-term intake, and self-reported food records carry measurement error.
Protein Intake Trend Calculator | Seven-Day Average and Consistency FAQ
Why use seven days?
It includes weekdays and weekends while remaining practical to track.
Is a positive slope always good?
No. Direction must be interpreted against the selected target and context.
Can one high day compensate for a low day?
The weekly total rises, but distribution and daily sufficiency remain separate considerations.
What does variability mean?
It is the population standard deviation of the seven daily totals.