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Read the Oil-Based Calculator

Enter your weekly amount, the concentration printed on your vial and your schedule, and read back what those numbers mean: the draw per injection, its syringe units, and how long a vial lasts — your own values, saved nowhere.

Written for Keel 1.0.0Guides v1Screens from build 1 (4cbadaa)

Before you begin

It is free; only From Your Routine (Pro) is gated. There is no error text: results stay hidden until weekly dose, schedule and concentration are all numbers above zero.

Keel tracks. It never advises. This calculator divides and multiplies the numbers you enter; nothing here suggests an amount, a concentration or a schedule.

Steps

  1. Open Tools › Calculators › Oil-Based Calculator.
  2. Under Your dose, enter Weekly dose in mg. It has no presets.
  3. Enter Concentration in mg/mL as printed on the vial; the chips (50–400) are shortcuts only for a value already on the label.
  4. Under Injection schedule, select the schedule you already follow: ED, Every 36h, EOD, E3D, Twice weekly, Weekly, Bi-weekly or Custom. From Tools the screen opens on Twice weekly — a starting position, not a suggestion.
    • Custom adds an Every field in days.
  5. Optional: under Your vial, enter Vial size in mL (above zero, or the supply section stays hidden).
  6. Optional: enter Number of vials (from Tools it starts at 1; empty, invalid or below one counts as one).
  7. Read the result card: DRAW PER INJECTION in mL, ON YOUR SYRINGE in units (on an insulin barrel), then Per injection (mg), Injections per week and Weekly volume (mL). The footer reads "Calculated from your values."
  8. Read Your supply: On hand, Injections per vial, Total injections, Supply lasts about (weeks) and Runs out around (a date counted from today).
  9. Under Your syringe, pick the barrel you use; the drawing and On this syringe show the draw on it.

What it looks like

Oil-Based Calculator inputs: Weekly dose 150 mg, Concentration 200 mg/mL with the 200 chip selected, Twice weekly selected, Vial size 10 mL, Number of vials 1.
Fictional example: a weekly amount, a concentration printed on a vial, a schedule and a vial size — the inputs, none of them a suggested amount or schedule.
  1. Weekly dose
  2. Concentration
  3. schedule chips
  4. Vial size

Fictional example. The values are the app’s own sample inputs, shown to explain how the fields relate; they are not a preparation, a protocol or a recommendation.

Result card reading Draw per injection 0.38 mL, On your syringe 37.5 u, then rows Per injection 75 mg, Injections per week 2, Weekly volume 0.75 mL, and the footer Calculated from your values.
Fictional example continued — not a suggested draw: the volume Keel computes from those inputs, its U-100 units, and the per-injection, per-week figures beneath.
  1. DRAW PER INJECTION
  2. ON YOUR SYRINGE
  3. Per injection / Injections per week / Weekly volume
Your supply rows (On hand 2,000 mg (10 mL), Injections per vial 26, Total injections 26, Supply lasts about 13 weeks, Runs out around Dec 11, 2026) above a drawn 1 mL syringe filled to 37.5 units with an On this syringe row reading 37.5 units.
The same fictional example continued — not a suggested supply or schedule: what one 10 mL vial holds, how many injections and weeks it covers, and the draw on a 1 mL syringe.
  1. On hand
  2. Supply lasts about
  3. Runs out around
  4. barrel picker
  5. On this syringe

Runs out around reads Dec 11, 2026: this panel comes from a launch opened on 11 September 2026 and captured the next day, so the date was computed from the earlier day. On your device it counts from today.

Your syringe with the 0.3 mL · 30 u barrel selected, the drawing filled to the top with its callout at 30 u, On this syringe 37.5 units, and the warning This draw is more than this syringe holds.
Fictional example, not a suggested draw: the smaller barrel’s callout caps at 30 u; On this syringe still reads 37.5 units, with an overflow warning.
  1. barrel picker
  2. warning

What you’ll see

Results appear only while Weekly dose, a schedule and Concentration are all valid; empty or zero hides the card rather than showing an error. Injections per vial is the whole number of draws that fit; Runs out around counts from today, so it changes day to day.

ON YOUR SYRINGE appears only for the insulin barrels and uses the U-100 scale, 100 units per mL. If the draw exceeds the barrel you picked, the drawing fills to the top and the line This draw is more than this syringe holds. appears.

Notes and troubleshooting

Read the reconstitution calculatorUse the Syringe Units converter

Where these screens come from
  • g9-f1 — G9-F1.png from Keel-V1-4cbadaa-guide-figures-C-20260912-171753-79960; package seal de2629f2fc7b9aeed83f059dc0f92be4a6d6641cf4f79478b4fb9d1e9425e9b6; source f46f9a840cf55782bdd3a2606015f5f0fe07d16c390ab0a83c59493f7616d674; figure acbe07a08649b593f2c5dfd8726ad77a947ce485890386acbe7eab6abb240fca
  • g9-f1b — G9-F1b.png from Keel-V1-4cbadaa-guide-figures-C-20260912-171753-79960; package seal de2629f2fc7b9aeed83f059dc0f92be4a6d6641cf4f79478b4fb9d1e9425e9b6; source d26050a46ce2a36003df95dfc79dd57f2a48c6404457336975b77cc968ac80e1; figure 25772b913022bc4f22e4a695a39cf9c98677c61a9d33a5adfb8106a501825966
  • g9-f1c — G9-F1c.png from Keel-V1-4cbadaa-guide-figures-C-20260912-171753-79960; package seal de2629f2fc7b9aeed83f059dc0f92be4a6d6641cf4f79478b4fb9d1e9425e9b6; source e619323202545995c43d54eb1fa10876cd7b30f10ca1bc0859682ac2973afffe; figure 427017e6c55339b76f2e1e609e6fa40e0679ac156a7dd7a03f25d88df7fdbfc3
  • g9-f2 — G9-F2.png from Keel-V1-4cbadaa-guide-figures-C-20260912-171753-79960; package seal de2629f2fc7b9aeed83f059dc0f92be4a6d6641cf4f79478b4fb9d1e9425e9b6; source e424081ec79b0283d2013d198a8d0bf780251bcd897431c3a472e813e1e34954; figure 50b8f82be1148ffda46d91d2d1ed6cf36027feb7a8a0528558673ea967668868

Every screen is a real capture of Keel 1.0.0 (build 1, implementation 4cbadaa), cropped and otherwise unchanged, except the paywall illustration, whose price columns are masked in the image itself. The numbered markers are added on this page, not to the app. Crop and mask coordinates for every figure: where the screens come from.