All Calculators by Category
Every tool on LetUsCalc in one place, grouped by the job it does. Pick a category below to find the calculator that produces the number you need — shipping dimensions and freight class, generator and battery sizing, or quarterly self-employment tax.
Streamline your supply chain operations and calculate shipping configurations instantly.
Smart sizing estimation tools for household management, hardware, and engineering projects.
Estimate quarterly taxes, deductions, and self-employment liabilities for freelancers and 1099 contractors.
Free Online Calculators for Shipping, Sizing, and Self-Employment
LetUsCalc is a growing library of free online calculators built around one idea: you arrive needing a specific number, and you should leave with it in seconds. Every calculator on this page runs entirely in your browser, so there is no sign-up, no paywall, no waiting on a server, and nothing you type is ever sent to us or stored. The three categories below cover logistics and freight, home and technical sizing, and self-employment finance.
Logistics and freight calculators
Freight pricing hinges on which mode you ship. LTL carriers in North America rate shipments by NMFC freight class derived from density, which the freight class calculator works out from your dimensions and weight. Parcel carriers bill on the greater of actual or dimensional weight, so the DIM weight calculator applies your carrier's divisor before you book. For ocean freight, the CBM calculator converts carton sizes into cubic metres and estimates 20ft and 40ft container fill, while the pallet calculator shows how many cases fit on a 48x40 GMA pallet or a custom footprint.
Home and technical sizing calculators
Sizing electrical equipment comes down to separating running watts from starting watts. The generator size calculator accounts for motor surge and adds a safety margin for home standby, RV, and job-site loads. The battery runtime calculator estimates how long a UPS or battery bank holds a load once depth of discharge and inverter losses are taken out, and the solar panel calculator works back from monthly kWh use and local peak sun hours to a panel count and array size.
Finance and self-employment calculators
Contractors owe both halves of self-employment tax and pay it in quarterly instalments rather than through withholding. The 1099 tax calculator estimates self-employment tax, federal income tax, and what to set aside each quarter, so you can budget from net rather than gross income.
Each result uses the standard published formula for its field and is accurate for planning and estimation. For binding freight quotes, electrical installations, or filed tax returns, confirm the figures with your carrier, a licensed electrician, or your accountant.