Travel Packing Calculator
Overpacking is easy to avoid once you frame it as a wear-cycle problem. This calculator works out how many days of clothing you actually need to carry by dividing your trip length by how often you plan to do laundry, then multiplying by your own daily-use rate for tops, underwear, and socks. Set the rates to match your habits and the laundry interval to your plans. The result rounds up to whole garments so you are never caught short, helping you pack light without running out of clean clothes.
Packing formula
Wash cycles = ceil(trip days / laundry interval)
Wear-cycle days = min(trip days, laundry interval)
Tops = ceil(wear-cycle days * tops per day)
Underwear = ceil(wear-cycle days * underwear per day)
Socks = ceil(wear-cycle days * socks per day)
You only need enough clothing to last between washes, so the count is driven by the wear-cycle, not the whole trip. All rates are your own inputs, and quantities round up to whole garments.
Packing smart
- The fewer days between washes, the less you carry.
- Set the laundry interval to your trip length if you will not wash anything.
- Reuse outer layers like trousers across several days to cut bulk.
- Add formal or activity-specific items on top of the daily rotation.
- Rounding up guarantees a clean set for every day of the wear-cycle.
Travel packing: frequently asked questions
How does the packing calculator decide quantities?
It divides your trip length by how often you do laundry to find how many wear-cycles you must cover, then multiplies by your daily-use rate for each item. For example 12 days with laundry every 6 days is two cycles, so you pack enough for 6 days of wear of each item.
How does the laundry cycle change the count?
Doing laundry more often means you pack less. If you never plan to wash clothes, set the laundry interval equal to or greater than your trip length and the calculator packs for the whole trip. Shorter intervals reduce the number you carry.
What daily-use rates should I use?
Set them to your habits. One top and one pair of underwear per day is common; some travellers pack a fresh pair of socks per day and reuse trousers across several days. The calculator multiplies the wear-cycle days by whatever rate you enter for each category.
Does it account for special outfits?
Add any formal or activity-specific items on top of the calculated daily quantities. The calculator covers everyday rotation; one-off needs like a wedding outfit or hiking gear should be added separately to your list.
Why round up?
You cannot pack a fraction of a garment, and underpacking leaves you short. The calculator rounds each category up to the next whole item so you always have enough to cover the wear-cycle you specified.
Official sources
- U.S. Transportation Security Administration: What Can I Bring (packing rules).
- U.S. Department of State: Before You Go travel guidance.
Reviewed by the CalculatorHub team, edited by James Graham, 16 June 2026. See our methodology.