Sleep Cycle Calculator
Find the best time to wake up in Pakistan — aligned to 90-minute sleep cycles.
About the Sleep Cycle Calculator
If you have ever wanted a fast, reliable Sleep Cycle Calculator that works on your phone without sign-ups or ads getting in the way, this is it — the figures update the moment you type.
Health numbers — BMI, BMR, calorie needs, ideal weight — are the foundation of any fitness or weight plan. This Sleep Cycle Calculator computes one of them accurately so you can set goals based on your body's actual numbers rather than generic advice.
The calculation follows established medical formulas: the Mifflin-St Jeor equation for BMR, the standard BMI classification, and the activity multipliers used by dietitians to estimate total daily energy needs.
For Pakistanis, the same BMI and calorie standards apply, but body composition varies — which is why these tools are starting points, not diagnoses. Combine the number with professional advice for serious health goals.
Track the number over time rather than once. Whether it is BMI trending down or calorie needs changing with activity, the trend tells you whether your plan is working.
Come back to the Sleep Cycle Calculator whenever your numbers change; because everything runs live in your browser, you can re-run it as many times as you need at no cost.
How to use the health calculator
- 1
Enter your weight, height, age and sex as labelled.
- 2
Adjust activity level where the tool asks.
- 3
Read your BMI, BMR or calorie target, updated live.
- 4
Repeat periodically to track your trend.
Frequently Asked Questions
Why 90-minute cycles?
Sleep runs in roughly 90-minute cycles through light, deep and REM stages. Waking at the end of a cycle leaves you refreshed; waking mid-cycle leaves you groggy.
Is BMI accurate for everyone?
BMI is a screening tool, not a diagnosis. Muscular individuals may show a high BMI while being healthy, and it doesn't account for age, sex or body composition. Use it as a guide, not a verdict.
How many calories should I eat to lose weight?
Eat 300–500 calories below your total daily energy needs (BMR × activity factor). A deficit of 500 calories per day leads to roughly 0.5 kg of fat loss per week.