Calculators
Planning tools for practical computer care, with visible assumptions and units.
Estimate a planning budget for replacing a computer inventory by multiplying device counts by user-entered replacement costs and adding a contingency allowance. This worksheet assumes one average cost per device category and does not include taxes, labor, or financing unless included in your inputs.
Estimate the total cost of a planned computer mentoring session block from reader-supplied hours and hourly rate. This is a simple budget estimate; it does not schedule sessions or include taxes, fees, or other costs.
Estimate a parts budget by adding the prices of selected components and a user-entered reserve for compatible cables, adapters, or small extras. This is a planning worksheet based on your own prices, not a live market quote or compatibility check.
Multiply your estimated repair labor hours by the hourly rate quoted to you. This worksheet does not predict repair time, market rates, billing increments, tax or parts costs.
Estimate a computer repair part's selling price from its purchase cost and markup percentage. The result is a per-part price before tax, labor, shipping, or other charges.
Estimate a practical number of weeks between routine computer care checks from your weekly operating hours, workload, environment, and preferred baseline interval. This is a planning estimate, not a manufacturer service schedule.
Estimate how long a desktop computer can run from a battery backup using its measured power draw, usable battery energy, and an efficiency allowance. This is a planning estimate, not a runtime guarantee.
Calculate the listed cost per terabyte of a hard drive using its total price and usable capacity. Enter price and capacity in the same currency and in decimal terabytes (TB).
Calculate the horizontal desk space remaining in front of a monitor by subtracting the monitor stand depth and any other equipment depth from the desk depth. Measure all dimensions in centimeters.
Estimate the time needed to transfer a specified amount of data at a sustained transfer rate. Enter the data size in gigabytes and the rate in megabits per second. The estimate assumes a constant rate and decimal gigabytes.
Estimate backup storage in gigabytes from the size of one full PC backup, the number of full backups you keep each week, your retention period, and extra capacity headroom. This model assumes every retained backup uses the full stated size.
Estimate hands-on transfer time from the amount of data, effective transfer speed, and a fixed setup and verification allowance. The estimate assumes one continuous transfer and does not include unattended time or troubleshooting.
Estimate a PC's annual electricity cost from its average power use, daily operating time, days used per year, and your electricity price per kilowatt-hour. The estimate covers the PC only and assumes steady average power use.
Estimate a PC's monthly electricity use and cost from its average power draw, daily operating hours, and electricity rate. This worksheet assumes a 30-day month and steady average power draw.
Compare the listed price of a RAM kit with its advertised capacity to calculate its price per gigabyte. This simple comparison excludes taxes, shipping, discounts, and differences in memory performance or compatibility.
Estimate an hourly rate for a computer repair job from your base labor rate, job hours, parts cost, overhead, and selected complexity factor. This worksheet spreads parts and overhead across labor hours and applies the chosen factor to the base rate.
Estimate a repair toolkit budget from item counts, average prices, and a contingency allowance. This planning estimate uses your own prices and does not verify product compatibility or current listings.
Calculate a screen's diagonal from its width and height. Enter both dimensions in the same unit to get the diagonal in that unit.
Estimate the percentage of a UPS's rated watt capacity used by connected equipment. Enter the UPS watt rating and the total equipment load in watts.
Estimate a workstation upgrade budget from the parts and labor you enter, plus a contingency allowance. This worksheet uses your own prices and assumes the selected contingency applies to parts and labor together.