Is First-Month-Free Storage Cheaper for a Three-Month Stay?
Start with the whole stay
Under the hypothetical inputs below, offer A costs 314 USD for three billed months and B costs 360 USD: A is 46 USD lower. At six months they nearly tie; at seven, B is 14 USD lower. A cheaper opening month therefore does not settle the comparison.
These are invented arithmetic inputs, not current provider prices or a recommendation. The task is to compare entered storage costs for equivalent needs, then separate those costs from cash needed before a possible deposit refund. Unit suitability, availability and contract interpretation require separate confirmation.
Collect a matched pair of quotes
Use the same intended move-in date, billed duration, currency and storage requirements for both offers. Check the unit dimensions and relevant access or service conditions before comparing money; a low total for an unsuitable unit does not solve your storage problem. Geometric box volume alone cannot determine the unit you need.
Record the billing period rather than converting calendar days into an assumed number of months. Ask what period the quoted rent covers and when the promotion applies. This calculator models a discount at the beginning of the stay followed by fixed regular rent. A promotion only in a later month, changing charges or prorating needs a separate worksheet.
Use this input worksheet with each quote:
| Quote item | Where it belongs | What to establish |
|---|---|---|
| Discount | Discount months and promotional monthly rent | Starting duration and rent amount |
| Recurring rent | Regular monthly rent | Amount after the opening discount |
| Monthly extras | Insurance, tax or other monthly rows | Included, separate, not applicable or unknown |
| Opening charges | Administration, tax or other one-time rows | Amount charged once |
| Refundable cash | Deposit row | Amount and refund treatment |
For separate charges, enter the confirmed USD amount. Choose included only when it is already counted in rent; choose not applicable only after confirmation. An unknown charge is not zero. Check the quote checklist when two offers describe the same item differently.
Read three different money results
For this fixed-rate model, let n be billed months, p opening discount months, d discount rent, r regular rent, e monthly extras and f one-time fees. With all charges resolved:
cost = p × d + (n − p) × r + n × e + f
The modeled first payment is first-month rent plus one month of extras, one-time fees and the deposit. With no discount months, first-month rent is regular rent. Period cash outlay before refund is modeled cost plus the deposit. These cash figures assume the displayed first-payment pattern; they do not model several months prepaid or a provider’s exact payment schedule.
A confirmed-refundable deposit is excluded from modeled cost but included in cash outlay. This does not guarantee repayment. A nonrefundable charge belongs in a one-time cost row. If the amount or refund treatment is unresolved, keep the result as a known subtotal with unresolved items.
Example 1: the promotion loses its lead
Both hypothetical offers use whole billed months and fixed recurring amounts. Deposits and taxes are not applicable in this example; other unlisted charges are also marked not applicable.
- A: one opening month at 0 USD rent, then 120 USD/month; other monthly costs 15 USD; one-time administration 29 USD.
- B: no discount months, rent 105 USD/month; other monthly costs 15 USD; no one-time charge.
For integer months n >= 1, A is 135n − 91 and B is 120n.
| Billed months | A cost | B cost | Lower modeled cost |
|---|---|---|---|
| 1 | 44 USD | 120 USD | A by 76 USD |
| 3 | 314 USD | 360 USD | A by 46 USD |
| 6 | 719 USD | 720 USD | A by 1 USD |
| 7 | 854 USD | 840 USD | B by 14 USD |
At three months, A is 0 + 2 × 120 + 3 × 15 + 29 = 314; B is 3 × 105 + 3 × 15 = 360. The free rent does not remove A’s 15 USD monthly extra or 29 USD opening charge.
A minus B equals 15n − 91. It remains negative through month six and becomes positive at month seven. The fractional equality, about 6.07 months, is not a supported booking duration: this example bills whole months. If the stay could last three to seven billed months, keep both totals for those durations instead of describing A as always cheaper.
Example 2: lower cost, higher cash requirement
Keep Example 1’s three-month inputs, but give A a hypothetical 100 USD deposit with confirmed-refundable treatment; B has none. Actual refund remains unguaranteed.
| Three-month measure | A | B |
|---|---|---|
| Modeled cost excluding refundable deposit | 314 USD | 360 USD |
| First payment before refund | 144 USD | 120 USD |
| Period cash outlay before refund | 414 USD | 360 USD |
A’s first payment is 0 + 15 + 29 + 100 = 144. Its modeled cost is still 46 USD lower, while its first payment is 24 USD higher and period cash before refund is 54 USD higher. Decide which cash requirement you can meet separately from the cost ranking.
Now consider an unresolved fee: if A’s administration charge is unknown instead of known at 29 USD, its known three-month rent-and-extras subtotal is 285 USD. That subtotal cannot establish that A beats B’s 360 USD. Do not carry the old 46 USD saving into this incomplete comparison.
Reproduce the comparison in the calculator
Enter three months and one discount month for A. Use promotional rent 0, regular rent 120, other monthly costs 15 and administration 29. Resolve every remaining extra and the deposit as not applicable for Example 1. Calculate, then choose “Keep current quote as A”.
Replace the fields with B: three months, zero discount months, regular rent 105, other monthly costs 15, and remaining extras and deposit not applicable. Recalculate. The comparison covers at least 12 months, or the longer entered duration, up to 120 months; unresolved costs prevent a definitive crossover. A stays only in page memory and clears on Reset or reload.
“Try an example” loads a different example: promotional rent 1 USD and deposit 100 USD. At three months, it yields a cost of 315 USD, first payment of 145 USD and period cash outlay of 415 USD. Set the fields above explicitly to reproduce the zero-rent comparison.
Check errors and limits before choosing
Count each included fee once; double-counting inflates one offer. Keep monthly and one-time charges separate; repeating an opening fee makes longer stays look too expensive. Compare the same billed durations; comparing A at three months with B at six gives a different question. Revisit the inputs if the quote changes.
The model excludes future rent increases, variable monthly charges, later-only promotions, prorating, availability, insurance obligations, refund guarantees and contract advice. If you also need transport, compare its entered costs separately with the truck/container guide.
STORAGE-FEES — Public Storage search listings, accessed October 3, 2026, show promotional rent alongside a separate one-time administration fee. This supports only that narrow distinction, not our invented amounts, eligibility or tax, insurance, deposit and refund terms. Confirm the exact offer directly.
AI-assisted content. Examples are hypothetical; check current product and provider terms.