TRIMSHEET

DWG NO. TRIMSHEET-001 · TITLE

Recompute your aircraft’s weight & balance every time you change equipment

Enter the current empty weight and CG, add or remove equipment, and get the amendment record for your aircraft file — the sheet your IA or shop signs, or the one you keep yourself for an experimental.

Open the calculator ↓
RevA
ScaleNTS
DrawnOwner/Op
Approved—
DATUMNAV/COMM10 LB · ARM 46 INBALLAST4 LB · ARM -18 IN

Every equipment change moves this beam.

Why an amendment record

Every equipment change moves the CG

Add a radio, pull an old ELT, swap a prop, reupholster the seats — the aircraft’s empty weight and CG changed, and the weight-and-balance record on file needs to change with it.

The record, not the math:the arithmetic is simple; keeping a signed, dated amendment for every change is the part that gets skipped. TrimSheet does the recompute and lays out the sheet — your IA or shop still signs it for a certified aircraft, and you keep it in your own records for an experimental.

The amendment calculator

Enter the current record, then work the change

Current record

Your numbers stay in your browser — nothing is uploaded.

Equipment changes

Enter the current empty weight and CG to start the amendment.

Revision history

How the amendment gets drawn up

AEnter the current recordType the aircraft's current empty weight and CG (or moment) straight off the existing W&B sheet.
BAdd or remove equipmentOne row per item: label, weight, and its arm from the datum. Fore-of-datum arms are negative.
CGet the amendment recordThe recomputed empty weight, CG, and moment, with a before/after and a per-item breakdown, ready to sign.

Planned pricing

Free for one aircraft. Pro when you run more than one.

Free

$0

  • One aircraft
  • Compute the amendment
  • Print the record

Pro

$9/mo or $69/yr

  • Unlimited aircraft
  • Full amendment history
  • PDF export with shop letterhead
  • Custom envelopes

Early access

Get TrimSheet

The calculator above is free and always will be. An account adds what it can’t do on its own: this aircraft’s amendment history saved across sessions, a printable/PDF copy of the record for your file, and more than one aircraft under one login. Leave your email and you’re first in line when it opens.

We only email you when it opens. No list sales.

Questions

Before you sign anything

Does this replace my IA's sign-off?

No. For a certified aircraft, TrimSheet produces the amendment sheet — the recomputed empty weight, CG, and equipment list — that your IA or shop reviews and signs into your records. For an experimental, you're the one who signs your own W&B record, and TrimSheet is the sheet you keep.

Does it file or generate an FAA form?

No. TrimSheet computes the new weight and balance and lays out the amendment record. It doesn't submit anything to the FAA or generate a federal form.

Is my aircraft data private?

Yes. The free tier keeps your one aircraft in your browser; Pro accounts store your history so it's there next time you open it. We don't sell or share it.

Is TrimSheet open yet?

Early access is rolling out. Leave your email and you're on the list for the next opening.

Why not just use ForeFlight or my own spreadsheet?

A per-flight W&B app like ForeFlight computes today's load against your aircraft's CURRENT empty weight and CG — it doesn't produce the amendment record itself. A spreadsheet can do the same arithmetic, but it's easy to fat-finger a transposition and there's nothing that stamps a dated, signable record of what changed. TrimSheet is specifically for the moment equipment changes: an updated equipment list, the new empty weight and CG, and a record laid out to be signed into your aircraft's permanent file.