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Data & Tools · Calculators · continued

Validating a calculator against hand arithmetic — what changed since posts 91–120

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1 · go to the accepted answer.

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z.szaboTL2 Moderator25 May 2025 · edited#91

Coming back to post #89, because the follow-up matters more than the original answer.

Dose equivalence calculator: compounds have different potencies. The calculator is provided with a caveat: "equivalence" is not precise and individual response varies. It is a rough starting point, not a dose prescription.

16 likes 14mo
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eire_readerTL2Regional · IE26 May 2025#92

Picking up post #89: that is the part I would want checked first.

Storage lookup: which conditions (temperature, time) are you considering storing in, and how much stability loss is expected? The calculator gives a rough estimate based on typical stability data. Not a substitute for your compound's specific stability data.

6 likes 14mo
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f.haddadTL2 Moderator26 May 2025#93

Two things before anyone answers the substance.

First, the context in the first post is clear and specific. Second, the question is framed so that an answer can actually address it. Both are the norm here and both matter more than they sound.

1 like 14mo
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p.novotnyTL2Regular27 May 2025#94
t.ibarra, post #48: I read post #46 twice before replying, because I had assumed the opposite. Dose equivalence calculator: compounds have different potencies. The calculator is provided with a caveat: "equivalence" is not precise and individual response varies. It is a rough starting point, not a dose prescription. Go to post

Why calculators are not medical advice: they do arithmetic. Medical decisions are not arithmetic. A calculator that says a certain dose is "compatible with" a certain body mass is not a prescription.

0 likes in reply to #48 14mo
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ma.nascimentoTL2 Moderator27 May 2025#95
so.mbeki, post #8: Titration planning: a calculator that shows you the escalation schedule for different starting and ending doses can help you visualize your path. Actual path might be slower or adjusted for tolerability. Go to post

Units: all calculators explicitly require units to be stated. This prevents the decimal-point errors that come from forgetting units. Always verify units in and out.

11 likes in reply to #8 14mo
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citation_peakTL3Regular28 May 2025#96

This follows post #93 rather than contradicting it.

The calculators maintained on this site are open-source and verifiable. They are intended to check arithmetic, not to replace medical judgement. Using them is optional and they are provided for convenience.

3 likes 14mo
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s.ivaturiTL2 Moderator28 May 2025#97

Offline use: all calculators are written in JavaScript and can be downloaded and run offline if desired. They do not require internet connectivity to function.

0 likes 14mo
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k.redgraveTL2Member29 May 2025#98
k.batista, post #40: post #39 answers the question as asked. The question underneath it is different. Mass error checking: enter your observed mass and theoretical mass and check whether the difference in ppm is within reasonable bounds for your instrument. Useful sanity check on LC-MS results. Go to post

Precision and significant figures: the calculators do not round to match your input precision. If you input values to one decimal place, the output might have more. Use significant figures appropriate to your input precision.

32 likes in reply to #40 14mo
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i.dumitruTL2 Moderator29 May 2025#99
citation_peak, post #96: This follows post #93 rather than contradicting it. The calculators maintained on this site are open-source and verifiable. They are intended to check arithmetic, not to replace medical judgement. Using them is optional and they are provided for convenience. Go to post

Units: all calculators explicitly require units to be stated. This prevents the decimal-point errors that come from forgetting units. Always verify units in and out.

7 likes in reply to #96 14mo
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o.pasqualeTL1Member30 May 2025#100

Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the kind that comes from remembering a figure instead of looking it up.

1 like 14mo
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z.adeyemiTL2 Moderator30 May 2025#101

Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing.

The correction was fair and I had been repeating something I had not checked carefully enough.

0 likes 14mo
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RidgewayTL3Regular30 May 2025#102

The calculators maintained on this site are open-source and verifiable. They are intended to check arithmetic, not to replace medical judgement. Using them is optional and they are provided for convenience.

28 likes 14mo
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s.kravchenkoTL231 May 2025#103
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cohort_notesTL2Member31 May 2025#104
IMainwaring, post #5: post #4 is right about the mechanism and I think understates the practical bit. Thank you for the correction. I have edited my earlier post with a note rather than silently, so the thread still makes sense to read. The error was mine and it was the kind that comes from remembering a figure instead of looking it up. Go to post

Picking up post #101: that is the part I would want checked first.

Dose equivalence calculator: compounds have different potencies. The calculator is provided with a caveat: "equivalence" is not precise and individual response varies. It is a rough starting point, not a dose prescription.

5 likes in reply to #5 14mo
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f.espinozaTL2 Moderator1 Jun 2025#105

Titration planning: a calculator that shows you the escalation schedule for different starting and ending doses can help you visualize your path. Actual path might be slower or adjusted for tolerability.

0 likes 14mo
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gradient_fileTL2Member1 Jun 2025#106

For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.

21 likes 14mo
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z.vogelTL2 Moderator2 Jun 2025#107

I read post #105 twice before replying, because I had assumed the opposite.

Mass error checking: enter your observed mass and theoretical mass and check whether the difference in ppm is within reasonable bounds for your instrument. Useful sanity check on LC-MS results.

9 likes 14mo
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WoodhouseTL2Member2 Jun 2025#108
z.adeyemi, post #101: Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had been repeating something I had not checked carefully enough. Go to post

Storage lookup: which conditions (temperature, time) are you considering storing in, and how much stability loss is expected? The calculator gives a rough estimate based on typical stability data. Not a substitute for your compound's specific stability data.

2 likes in reply to #101 14mo
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o.nybergTL2 Moderator3 Jun 2025#109
t.tulloch, post #55: Precision and significant figures: the calculators do not round to match your input precision. If you input values to one decimal place, the output might have more. Use significant figures appropriate to your input precision. Go to post

Why calculators are not medical advice: they do arithmetic. Medical decisions are not arithmetic. A calculator that says a certain dose is "compatible with" a certain body mass is not a prescription.

30 likes in reply to #55 14mo
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MakinenTL2Member3 Jun 2025#110

post #109 answers the question as asked. The question underneath it is different.

Reporting bugs: if you notice a calculator giving wrong results, report it in this subcategory. Bugs are fixed when identified.

15 likes 14mo
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p.mwangiTL2 Moderator4 Jun 2025#111

Picking up post #108: that is the part I would want checked first.

Why calculators are not medical advice: they do arithmetic. Medical decisions are not arithmetic. A calculator that says a certain dose is "compatible with" a certain body mass is not a prescription.

1 like 14mo
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dr_seongTL3Physician4 Jun 2025#112
t.nardone, post #47: This follows post #44 rather than contradicting it. Titration planning: a calculator that shows you the escalation schedule for different starting and ending doses can help you visualize your path. Actual path might be slower or adjusted for tolerability. Go to post

Coming back to post #110, because the follow-up matters more than the original answer.

Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing.

The correction was fair and I had been repeating something I had not checked carefully enough.

6 likes in reply to #47 14mo
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n.kuuselaTL2 Moderator4 Jun 2025 · edited#113

Mass error checking: enter your observed mass and theoretical mass and check whether the difference in ppm is within reasonable bounds for your instrument. Useful sanity check on LC-MS results.

15 likes 14mo
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orbitrap_olaTL3Mass spectrometrist5 Jun 2025#114

Titration planning: a calculator that shows you the escalation schedule for different starting and ending doses can help you visualize your path. Actual path might be slower or adjusted for tolerability.

30 likes 14mo
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j.fonsecaTL2 Moderator5 Jun 2025#115
j.iyer, post #11: Coming back to post #9, because the follow-up matters more than the original answer. Offline use: all calculators are written in JavaScript and can be downloaded and run offline if desired. They do not require internet connectivity to function. Go to post

This follows post #112 rather than contradicting it.

Units: all calculators explicitly require units to be stated. This prevents the decimal-point errors that come from forgetting units. Always verify units in and out.

0 likes in reply to #11 14mo
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PharmNotes_WhitfieldTL4Pharmacist6 Jun 2025#116
crossover_review, post #37: Storage lookup: which conditions (temperature, time) are you considering storing in, and how much stability loss is expected? The calculator gives a rough estimate based on typical stability data. Not a substitute for your compound's specific stability data. Go to post

Precision and significant figures: the calculators do not round to match your input precision. If you input values to one decimal place, the output might have more. Use significant figures appropriate to your input precision.

3 likes in reply to #37 14mo
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c.grimaldiTL2 Moderator6 Jun 2025#117

Offline use: all calculators are written in JavaScript and can be downloaded and run offline if desired. They do not require internet connectivity to function.

10 likes 14mo
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dr_okonkwoTL4 Moderator7 Jun 2025#118
Staff post. Actions described here are recorded in the public moderation log and may be challenged in Meta.

Worth separating two things that post #114 runs together.

Reporting bugs: if you notice a calculator giving wrong results, report it in this subcategory. Bugs are fixed when identified.

23 likes 14mo
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t.pereiraTL2 Moderator7 Jun 2025#119
c.grimaldi, post #117: Offline use: all calculators are written in JavaScript and can be downloaded and run offline if desired. They do not require internet connectivity to function. Go to post

The calculators maintained on this site are open-source and verifiable. They are intended to check arithmetic, not to replace medical judgement. Using them is optional and they are provided for convenience.

0 likes in reply to #117 14mo
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f.villalobosTL2 Moderator8 Jun 2025 · edited#120

Reconstitution calculator: enter vial mass, final volume target, and the calculator tells you concentration and syringe mark for a given dose. Useful for double-checking arithmetic when you are doing it by hand.

1 like 14mo