> For the complete documentation index, see [llms.txt](/llms.txt).
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- miscellaneous
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.
[Start free →](/billing/checkout/?plan=free) [View OpenAPI](/v1/docs) [All categories](/tools/)
Automotive
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Engine Displacement Calculator engine-displacement-calculator
Calculate total and per-cylinder engine displacement from bore, stroke and cylinder count.
1cr · v2026-04-22
](/tools/engine-displacement-calculator/)
Construction
[
Bend Allowance Calculator bend-allowance-calculator
Calculate sheet-metal bend allowance, setback, deduction and flat-pattern length.
1cr · v2026-04-22
](/tools/bend-allowance-calculator/)
Electronics
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Battery Series/Parallel Calculator battery-series-parallel-calculator
Calculate battery-pack voltage, capacity, energy, resistance, discharge current and runtime from an S/P layout.
1cr · v2026-04-22
](/tools/battery-series-parallel-calculator/) [
kVA Calculator kva-calculator
Solve kVA, kW, kVAR, volts or amps for DC, single-phase and three-phase systems.
1cr · v2026-04-22
](/tools/kva-calculator/) [
RC Low-Pass Filter Calculator rc-low-pass-filter-calculator
Calculate RC low-pass cutoff, time constant, gain, attenuation and phase at a selected frequency.
1cr · v2026-04-22
](/tools/rc-low-pass-filter-calculator/) [
Resistors in Series Calculator resistors-in-series-calculator
Add up to 200 series resistors and report each resistor's voltage-divider share.
1cr · v2026-04-22
](/tools/resistors-in-series-calculator/) [
Series/Parallel Capacitor Calculator series-parallel-capacitor-calculator
Calculate equivalent capacitance for a list of capacitors connected in series or parallel.
1cr · v2026-04-22
](/tools/series-parallel-capacitor-calculator/) [
Watts to Amps Calculator watts-to-amps-calculator
Convert watts to amps for DC, single-phase AC or three-phase AC systems.
1cr · v2026-04-22
](/tools/watts-to-amps-calculator/)
General Tools
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Tire Size Calculator tire-size-calculator
Calculate tire sidewall, diameter, circumference, and revolutions per mile.
1cr · v2026-04-22
](/tools/tire-size-calculator/)
Physics
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Mechanical Advantage Calculator mechanical-advantage-calculator
Calculate ideal and efficiency-adjusted mechanical advantage for levers, pulleys, ramps and gears.
1cr · v2026-04-22
](/tools/mechanical-advantage-calculator/)
Student Calculators
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Test Score Calculator test-score-calculator
Convert earned and total test points into a percentage, letter grade, and GPA points.
1cr · v2026-04-22
](/tools/test-score-calculator/) [
Weighted Grade Calculator weighted-grade-calculator
Calculate a weighted course grade from category weights and scores.
1cr · v2026-04-22
](/tools/weighted-grade-calculator/)
Time
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Daily Time Savings Calculator daily-time-savings-calculator
Calculate yearly, monthly, and weekly time saved from a small daily savings habit.
1cr · v2026-04-22
](/tools/daily-time-savings-calculator/)
API OPERATIONAL v1 · OpenAPI 3.1 · MCP 2025-06-18
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