For the complete documentation index, see llms.txt.
13 endpoints

Miscellaneous API

Same bearer token, same credit pool, same JSON envelope as every other endpoint — drop them into apps, sites, workflows, or agents without rebuilding formulas, validation, or docs.

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Automotive
Engine Displacement Calculatorengine-displacement-calculator
Calculate total and per-cylinder engine displacement from bore, stroke and cylinder count.
1cr · v2026-04-22
Construction
Bend Allowance Calculatorbend-allowance-calculator
Calculate sheet-metal bend allowance, setback, deduction and flat-pattern length.
1cr · v2026-04-22
Electronics
Battery Series/Parallel Calculatorbattery-series-parallel-calculator
Calculate battery-pack voltage, capacity, energy, resistance, discharge current and runtime from an S/P layout.
1cr · v2026-04-22
kVA Calculatorkva-calculator
Solve kVA, kW, kVAR, volts or amps for DC, single-phase and three-phase systems.
1cr · v2026-04-22
RC Low-Pass Filter Calculatorrc-low-pass-filter-calculator
Calculate RC low-pass cutoff, time constant, gain, attenuation and phase at a selected frequency.
1cr · v2026-04-22
Resistors in Series Calculatorresistors-in-series-calculator
Add up to 200 series resistors and report each resistor's voltage-divider share.
1cr · v2026-04-22
Series/Parallel Capacitor Calculatorseries-parallel-capacitor-calculator
Calculate equivalent capacitance for a list of capacitors connected in series or parallel.
1cr · v2026-04-22
Watts to Amps Calculatorwatts-to-amps-calculator
Convert watts to amps for DC, single-phase AC or three-phase AC systems.
1cr · v2026-04-22
General Tools
Tire Size Calculatortire-size-calculator
Calculate tire sidewall, diameter, circumference, and revolutions per mile.
1cr · v2026-04-22
Physics
Mechanical Advantage Calculatormechanical-advantage-calculator
Calculate ideal and efficiency-adjusted mechanical advantage for levers, pulleys, ramps and gears.
1cr · v2026-04-22
Student Calculators
Test Score Calculatortest-score-calculator
Convert earned and total test points into a percentage, letter grade, and GPA points.
1cr · v2026-04-22
Weighted Grade Calculatorweighted-grade-calculator
Calculate a weighted course grade from category weights and scores.
1cr · v2026-04-22
Time
Daily Time Savings Calculatordaily-time-savings-calculator
Calculate yearly, monthly, and weekly time saved from a small daily savings habit.
1cr · v2026-04-22