# Calculators

These calculators are a quick way for you to see how to improve productivity. Call your HP Representative for a direct comparison analysis.

• Time to Square Foot per Hour Conversion Formula

To calculate total square footage measurements per hour use the formula below.

60 / ISSA Min. = __________ x # square feet = per hour

First divide 60 (minutes) by the listed ISSA time per 1000 square feet. The total of this calculation multiplied by 1000 gives you the number of square feet per hour that may be accomplished by performing this task. Remember that many factors can affect this number in your particular facility.

Example:
Task #187 ‘Dust mop with a 24” Mop using Dust Treatment Chemical’ @ 7.2 minutes per 1000 square feet.

Calculation:
60 / 7.2 = 8.333 x 1000 = 8333 square feet per hour

• Conversion Chart : Time in Worker Hours
SecondsWorker Hours
10.0003
20.0005
30.0008
40.0011
50.0014
60.0017
70.0019
80.0022
90.0025
100.0028
150.0042
200.0055
250.0069
300.0083
350.0097
400.0111
450.0125
500.0138
550.0153
600.0167
MinutesWorker Hours
10.01670
20.03330
30.05000
40.06670
50.08333
60.10000
70.11670
80.13330
90.15000
100.16670
150.25000
200.33330
250.41670
300.50000
350.58330
400.66670
450.75000
500.83333
550.91670
601.00000
MinutesWorker Hours
1 hr 5 min1.0833
1 hr 10 min1.1667
1 hr 15 min1.2500
1 hr 20 min1.3333
1 hr 25 min1.4167
1 hr 30 min1.5000
1 hr 35 min1.5833
1 hr 40 min1.6667
1 hr 45 min1.7500
1 hr 50 min1.8333
1 hr 55 min1.9167
2 hr2.0000
2 hr 5 min2.0833
2 hr 10 min2.1667
2 hr 15 min2.2500
2 hr 20 min2.3333
2 hr 25 min2.4167
2 hr 30 min2.5000
2 hr 35 min2.5833
2 hr 40 min2.6667
• Team Cleaning
350Light Duty Specialist Office Building Cleaning1000 sq ft1006
351Vacuum Specialist Office Building Cleaning1000 sq ft1006
352Restroom Specialist Office Building CleaningEach Fixture 2
353Light Duty Specialist School Cleaning w/o Sink in classroomEach Room 4.5
354Light Duty Specialist School Cleaning with Sink in classroomEach Room 5.75
355Vacuum Specialist School CleaningEach Room 7.5
356Restroom Specialist School CleaningEach Fixture 3
357Check-in and Travel to Area, beginning of shiftEach 2
358Equipment Clean-Up and Restock, end of shiftEach 5
• Direct Metric Conversion
ApplicationSquare Meters per GallonSquare Meters per Liter
Stripper Application9.302.46
Wet Mop18.604.91
Damp Mop37.209.85
Auto Scrub with Gravity Feed Tank46.5012.2
Auto Scrub with Solution Dosing69.7518.4
Floor Seal Application139.5036.9
Floor Finish Application186.0049.1
• Cleaning Solution Coverage
SolutionSq Ft per Gallon
Stripping Solution100
Wet Mop Solution200
Damp Mop Solution400
Auto Scrub with Gravity Feed Tank500
Auto Scrub with Solution Dosing750
Floor Seal (water based) application1500
Floor Finish (water based) application2000
• Weights and Measures
 100 pounds = 45.35 kilograms 40 pounds = 18.14 kilograms 15 pounds = 6.79 kilograms 1 pound (16 oz.) = 0.45 kilograms 1 ounce = 28.35 grams 55 gallons = 208.18 liters 30 gallons = 113.55 liters 5 gallons = 18.93 liters 1 gallon (128 fl. oz.) = 3.79 liters 1 gallon water = 8.34 lbs. 1 quart (32 fl. oz.) = 0.95 liters 1 pint (16 fl. oz.) = 0.47 liters 1 cup (8 fl. oz.) = 0.24 liters 1 fl. oz. (8 fl. drams) = 29.57 milliliters
 1 fluid dram = 3.70 milliliters 1 kilogram = 2.05 pounds 1 gram = 0.353 ounce 1 milliliter = 0.27 fl. dr. (0.034 fl. oz.) 1 centiliter = 0.34 fluid ounce 1 deciliter = 3.38 fluid ounces 3 liters = .792 gallons 1 liter = 33.81 fluid ounces 1 liter = 1.057 quarts 1 liter = .264 gallons 1 cubic centimeter = 0.061 cu. inch 1 centimeter = 0.39 inch 1 meter = 39.37 inches
• pH Scale

The pH scale measures the amount of acidity or alkalinity in a chemical solution. Each number is ten times larger than the next number. Thus a pH of 1 is 10 times more acidic than a pH of 2; a pH of 2 is 100 times more acidic than a pH of 4. pH is derived from the Greek word for “Potency” and H is the symbol for hydrogen—thus, pH stands for the potency of the hydrogen ion in an aqueous solution.

Note the following:

1. Urine fluctuates from 5.5 to 8.0 depending on age, sex, food consumption, etc.
2. Never mix cleaning chemicals, especially those found on opposite sides of the pH scale because adverse reactions or neutralization of the mixture may occur.
3. All pH values are approximates.
4. Solvents do not have a pH because they do not ionize in aqueous solution.
5. pH does not measure the corrosiveness of an acid (i.e., HCL with a pH of 1 is stronger than Phosphoric with a pH of 1).