New tools
Check out the latest calculators.
Equipment Rent vs Buy Calculator
Decide whether to rent or buy construction equipment. Compare the annual cost of ownership against rental rates to get the break-even utilization, your monthly cost either way, and a clear buy-or-rent recommendation. Free, no sign-up.
Change Order Calculator
Price a construction change order with overhead, profit, and bond markup. Add labor, material, equipment, and subcontractor costs to get the total price, the markup added, and the true margin vs markup. Free, no sign-up.
Prevailing Wage Calculator (Davis-Bacon)
Calculate the Davis-Bacon prevailing wage. Enter the base rate and required fringe to get the total wage package, the fringe credit from the benefits you provide, the cash due in lieu, and the overtime rate. Free, no sign-up.
CCTV Lens & FOV Calculator
Calculate CCTV camera field of view and DORI distances. Enter sensor format, resolution, and lens focal length to get HFOV/VFOV angles and Detect, Observe, Recognize, and Identify ranges in feet per EN/IEC 62676-4. Free, no sign-up.
Labor Burden Calculator
Calculate the fully burdened labor rate for construction. Add payroll taxes (FICA, FUTA, SUTA), workers' comp, insurance, and benefits to a base wage to get the labor burden % and the true cost per productive hour for accurate bids. Free, no sign-up.
Man-Hours Calculator
Estimate construction labor man-hours, crew duration, and cost. Enter a quantity and a production rate or labor unit, your crew size, and a productivity factor to get total man-hours, work days, and labor cost. Free, no sign-up.
Retainage Calculator
Calculate construction retainage and your net progress payment. Enter the contract amount, percent complete, and retainage rate — with optional tiered reduction — to get the amount withheld, the net payment due this period, and the cumulative retainage held. Free, no sign-up.
PoE Power Budget Calculator
Check a PoE switch power budget per IEEE 802.3af/at/bt. Add powered devices by type and PD class to total the watts drawn, see the utilization and headroom, and confirm the load fits the switch budget and port count. Free, no sign-up.
Fiber Optic Loss Budget Calculator
Calculate a fiber optic link loss budget per TIA-568 and FOA. Add fiber length, connectors, and splices to total the cable plant loss in dB, then compare it to the transceiver power budget for the link margin and pass/fail. Free, no sign-up.
CCTV / NVR Storage Calculator
Calculate CCTV / NVR storage and bandwidth. Add IP cameras by resolution and codec (H.264/H.265) to get the hard drive size in TB for your retention days, plus the total network bandwidth. Free, no sign-up.
Solar String Sizing Calculator
Size a PV string per NEC 690.7. Get the maximum and minimum modules per string from module Voc/Vmp, temperature coefficients, your record-low and high design temperatures, and the inverter voltage window. Free, no sign-up.
EV Charger Circuit Calculator
Size a Level 2 EV charger circuit per NEC 625. Get the minimum breaker and copper or aluminum wire from the 125% continuous-load rule, plus charging power in kW and approximate miles added per hour. Free, no sign-up.
Concrete Block (CMU) Calculator
Estimate a CMU wall from its size: block count, mortar (cement + sand), core-fill grout, and rebar for 6, 8, and 12 in units per NCMA TEK 14-13. Subtract openings and add a waste allowance. Free, no sign-up.
Insulation Calculator
Find the DOE-recommended R-value for your climate zone and assembly, then the insulation thickness, blown-in bags or batt area, and cost — attic, wall, and floor per the 2021 IECC. Free, no sign-up.
Mortar Calculator
Estimate mortar for brick and block: bags of premixed mortar, or masonry cement and sand, by unit count or wall area. Includes Type N, S, M, O mix ratios per ASTM C270. Free, no sign-up.
Stucco Calculator
Estimate 3-coat stucco: bags of scratch, brown, and finish coat, or field-mixed cement and sand, from your wall area. Per ASTM C926 / SMA thicknesses. Free, no sign-up.
Drywall Calculator
Estimate drywall: sheets, screws, joint tape, and joint compound (mud) from your area or room size. Pick 4×8, 4×10, or 4×12 panels with a waste allowance. Free, no sign-up.
Drain Slope Calculator
Calculate drain pipe slope for DWV and sewer lines. Find the total fall from a run and pitch, or the slope from a measured drop, and check it against the IPC minimum grade by pipe size. Free, no sign-up.