Engineering tools
Small calculators built from the same reference formulas and figures I use on real project work, free to use for anyone.
Solar string sizing calculator
Solar PV array sizing and inverter matching: how many modules go in series and how many strings in parallel, checked against cold open circuit voltage, hot MPP voltage, current per MPPT and DC to AC ratio.
Open tool →Nepali date converter
Convert between Bikram Sambat and Gregorian dates, find the difference between two dates, calculate age in both calendars, and add or subtract time from a date, with Nepal's fiscal year worked out for you.
Open tool →Voltage drop calculator
AC and DC voltage drop, cable power loss, the smallest standard cable size that meets your target, and an indicative current carrying capacity check. Copper or aluminium, mm2 or AWG.
Open tool →Pipe friction loss calculator
Head loss and pressure drop for water pipes, using the Hazen Williams equation. Enter flow rate, diameter and pipe material.
Open tool →Nepal land area converter
Convert between Ropani, Aana, Paisa, Daam, Bigha, Kattha, Dhur, square feet, square metres, acres and hectares.
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