Construction · Equipment rental
Equipment rental period cost calculator.
Enter the three rates from the quote and how many days you need the machine. The page finds the cheapest way to cover the days.
At $200 a day, $600 a week and $1,800 for four weeks, a 10-day rental costs $1,200.00 (one week plus three days) instead of $2,000.00 at the day rate, and a 30-day rental costs $2,200.00. Those rates are examples, not a quote.
Rates and days
Your result
The rate you pay depends on which period you land in
Rental yards quote a day rate, a week rate and a 4-week rate, and the three are not proportional. A week rate is set by the yard and need not be seven times the day rate (in the example below it equals three day rates), so a job that runs six days can cost the same as one that runs seven, and a 27-day job can be cheaper on a 4-week rate than on three weeks plus six days. That makes the question “how many days do I need?” less useful than “which periods cover those days most cheaply?”, and that is what this page answers.
It takes the three rates from your own quote. Nothing here is a market rate: yards price differently by region, machine and season, and the numbers in the example are made up to show the arithmetic.
Worked example
With a day rate of $200, a week rate of $600 and a 4-week rate of $1,800, a 10-day rental costs $1,200.00: one week plus three days (or two weeks, which costs the same). The day rate alone would be $2,000.00, so the periods save $800.00, an effective $120.00 per day. A 12% damage waiver adds $144.00 and $75 of delivery brings the total to $1,419.00. For 30 days the best cover is one 4-week period plus two days: $2,200.00, or $73.33 per day against $6,000 at the day rate. Because the week rate equals three day rates, it matches the day-rate cost at day 3 and beats it from day 4.
How it is calculated
- For each number of days up to yours, the page tries ending the rental with a 1-day, 7-day or 4-week (28-day) period and keeps the cheapest total; a period may run past your last day. That finds the lowest-cost mix of the three.
- Damage waiver = rental charges × the percentage you enter. Total = rental charges + waiver + fees.
- Week-rate break-even = the week rate ÷ the day rate, rounded up to a whole day: from that day the week costs no more than day rates.
The period lengths come from one real contract. United Rentals contract #41156 (a NASPO ValuePoint master agreement hosted by South Carolina Procurement), Attachment A-1, section 1, says monthly rental rates reflect a 28-day cycle (7 days × 4 weeks), the weekly rate is based on 40 hours of usage but no more than 7 calendar days, the daily rate is based on an 8-hour day, and use beyond 8 hours a day adds the daily rate divided by 8 per hour. It also says a rental that runs past its period is re-rated to the longer period. That is a public-sector contract: your yard’s own terms may differ, so read the rental agreement. Calculation as of October 26, 2026.
What this does not cover
- Overtime hours. Rates are for a standard day or week of use; extra hours are billed on top under many agreements, and this page does not model them.
- Sales tax, fuel, cleaning, damage and late-return charges unless you put them in fees.
- Any yard’s actual prices. Rates are yours to enter.
Sources
- United Rentals contract #41156, Attachment A-1: standard increments of rental intervals (NASPO ValuePoint) (opened 2026-10-26)
Sources
Common mix-ups
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Often assumedA monthly rental rate covers a calendar month.
What the source saysIn United Rentals contract #41156, Attachment A-1, monthly rental rates reflect a 28-day cycle, 7 days times 4 weeks. The rate is for 28 days of rental, not for a calendar month. [1]
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Often assumedA weekly rate lets me run the machine as many hours as I like for seven days.
What the source saysThat contract bases the weekly rate on 40 hours of usage and no more than 7 calendar days, and the daily rate on an 8-hour day. Hours past 8 a day add the daily rate divided by 8 per hour. [1]
Checked against these sources on .
Frequently asked questions
How do I work out the cheapest equipment rental period?
Enter the day, week and 4-week rates and the days you need. The page tries every combination of day, week and 4-week periods that covers those days and shows the cheapest.
Is a week rate the same as seven day rates?
No. The yard sets it; in the example it equals three day rates. The weekly rate in the United Rentals contract is based on 40 hours of use within no more than 7 calendar days.
How long is a 4-week or monthly rental period?
In United Rentals contract #41156 a monthly rate reflects a 28-day cycle, 7 days times 4 weeks, not a calendar month. Check your own agreement.
What if I keep the equipment longer than planned?
In that contract a rental that runs past its period is re-rated to the longer period, so the earlier days can be repriced. Your terms may differ; read the agreement.
Does the page include overtime hours?
No. The day rate is based on an 8-hour day in that contract, and extra hours cost the daily rate divided by 8 each. Add them to fees if they apply.
Estimate only
This page is a planning aid, not a rental quote or advice. Results use the numbers you enter and the formulas and sources named above, as read on October 26, 2026. Everything runs in your browser; nothing is sent anywhere.