Seven tools, three families. Expand a family to see its tools — every plate
states what the tool outputs, where its data comes from, and what it can't know.
Field calculators04 tools
No. 01 · HitchMath
Calculator · Towing
Fifth-wheel and travel-trailer payload calculators that check the number that actually
decides it — your door-sticker payload, not the brochure tow rating. Pass/fail verdicts
per limit, the limiting factor named, and a summary you can paste into any forum thread.
- Output
- Pass / Marginal / Fail per limit — payload, tow rating, GCWR, rear axle
- Source
- Your door-sticker numbers; pin- and tongue-weight planning factors per the published methodology
- Runs
- In your browser; nothing sent
Can't know: your truck's real loaded weight — a CAT-scale ticket beats
every calculator, including this one.
Open fifth-wheel calculator → ·
Travel trailer ·
Why payload beats tow rating ·
FAQ ·
Methodology
No. 02 · Heat Pump Sizing
Calculator · HVAC
Estimates your design-day heating load as an honest range, checks any unit's certified
capacity at your design temperature (47/17/5°F rating points, conservatively
interpolated), and finds right-sized cold-climate certified models from ENERGY STAR data.
- Output
- Design-day load range (BTU/h) + right-sized certified model matches
- Source
- EPA ENERGY STAR certified products list; published design temperatures
- Runs
- In your browser; nothing sent
Can't know: your actual insulation R-values — it gives a range, not a point.
Open Heat Pump Sizing tool → ·
Methodology & sources
No. 03 · Backup Power Planner
Calculator · Electrical
Pick the appliances you must keep running; get the minimum generator size with the correct
single-largest-surge math, a battery option with a real inverter-surge check, and a 20-year
cost comparison — with the carbon-monoxide safety rules front and center.
- Output
- Minimum generator watts, battery + inverter option, 20-year cost comparison
- Source
- Published appliance running and surge wattages, cited in the methodology
- Runs
- In your browser; nothing sent
Can't know: your appliances' actual nameplate watts — check the labels;
surge draw varies by model.
Open Backup Power Planner tool → ·
Methodology
No. 04 · Passport Timeline
Calculator · Travel
Enter your travel date and how you're applying; get a dated SAFE / cutting-it-close /
won't-make-it verdict from the current official State Department processing and
mailing times — including the four weeks of mail most checklists forget.
- Output
- Dated SAFE / cutting-it-close / won't-make-it verdict
- Source
- U.S. State Department current published processing and mailing times
- Runs
- In your browser; nothing sent
Can't know: your application's actual place in the queue — these are
published averages, not a tracking number.
Open Passport Timeline tool →
SEC data · Chrome extensions02 tools
No. 06 · FilingSheet
Chrome extension · SEC data
A free Chrome extension that pulls any US public company's numbers from SEC EDGAR and
exports clean CSV — no API key, no account, nothing leaves your browser.
- Format
- Clean CSV (Pro adds all fiscal years, full line items, Excel)
- Source
- SEC EDGAR public company-facts API
- Runs
- In your browser; nothing leaves it
Can't know: anything EDGAR doesn't publish — if the SEC doesn't have
the number, neither do we.
Add FilingSheet to Chrome → ·
Details & Free-vs-Pro
No. 07 · FilingScout
Chrome extension · SEC data
Real filters, saved searches, match preview, CSV export — free, entirely in your browser.
- Format
- Filtered results with match preview; CSV export
- Source
- SEC EDGAR full-text search index (filings since 2001)
- Runs
- In your browser; nothing leaves it
Can't know: filings before 2001 — EDGAR's full-text coverage starts there.
Add FilingScout to Chrome → ·
Details