FREE PRACTICAL CALCULATORS
Make the numbers
part of the plan.
Compare your own estimates, expose missing costs and keep the assumptions with your trip. No live prices or booking recommendations.
Open my trips →ESTIMATE · COMPARE · ASK
Numbers with their assumptions attached.
Inputs save to your selected trip on this device. Blank costs are unknown, not zero. These tools do not calculate dive limits or determine fitness to dive.
Complete trip cost
Whole-group AUD totals. Leave unknown costs blank; enter 0 only when an item is included or not needed. Deposits already paid are part of the total, not another expense.
Six practical tutorials, with worked examples
The examples below use invented figures to explain the arithmetic. They are not current prices, quotes or airline allowances.
Complete trip cost
What will the whole trip cost, and what remains unpaid?
Whole-group AUD totals. Leave unknown costs blank; enter 0 only when an item is included or not needed. Deposits already paid are part of the total, not another expense.
- Use whole-group totals throughout. If a quote is per person, multiply it by the number of people before entering it.
- Separate transport, transfers, accommodation, diving, hire and everyday costs. Put each expense in one category only.
- Enter confirmed inclusions as zero. Leave unanswered prices blank and keep the quote date in your trip notes.
- Add a contingency if wanted, then record payments already made. A deposit reduces the outstanding amount; it does not increase the trip price.
Worked example
Two people enter $400 transport, $600 accommodation and $500 diving, with all other categories confirmed as $0. A 10% contingency adds $150 to the $1,500 subtotal. The estimate is $1,650, or $825 each. After $300 paid, $1,350 remains.
Read the result carefully
A partial total is a lower-information estimate, not a complete quote. Revisit it when transfers, hire or other blanks are resolved. Equal splitting assumes both people share the same costs; use group expenses for personal extras.
Open complete trip cost ↑Course quote comparison
What is actually included in each course offer?
Compare three real offers in AUD per learner. Enter 0 for included extras. Missing prices remain visible. This compares costs, not course equivalence or eligibility.
- Label each offer with the provider and exact course name. Keep currency and the per-learner basis consistent.
- Start with the headline price, then enter only additional charges for materials, equipment, practical sessions and travel.
- Use the notes field for the quote date, scheduled sessions, supervision and how extra practice is arranged.
- Ask the provider to resolve missing prices before comparing complete totals. Record policies for rescheduling and unfinished training separately.
Worked example
Offer A has a $650 headline price, $80 materials and $70 travel, with equipment and practical extras included: $800 entered total. Offer B is $720 plus $50 travel but has an unknown equipment charge. Its $770 is partial and cannot yet be treated as the cheaper complete offer.
Read the result carefully
Price does not establish course equivalence, teaching quality or eligibility. Use the course tutorials to prepare questions, then confirm the exact training arrangement with the provider.
Open course quote comparison ↑Rent or own: cost model
How do rental and ownership costs compare under my assumptions?
Compare your own estimates over a chosen period. Initial cost should include required accessories; annual costs should include servicing, consumables and other ownership expenses. Resale value is excluded.
- Compare the same set of equipment on both sides. Include necessary initial accessories in the purchase figure.
- Estimate recurring ownership expenses from actual service quotes and your situation. The model applies this annual amount in every year.
- Count outings, not individual dives, if your rental quote is charged per outing. Keep the same billing unit throughout.
- Try another usage estimate and a shorter ownership period. The result depends heavily on how often the equipment is used.
Worked example
A $1,200 purchase plus $150 annual ownership costs totals $1,650 over three years. Renting at $50 per outing for 12 outings a year totals $1,800. Ownership is $150 lower in this model; the estimated crossover is 1,200 ÷ (600 − 150), or 2.67 years.
Read the result carefully
This comparison excludes resale value and does not assess fit, suitability or maintenance condition. Crossover is a cost-model result, not a recommendation to buy. Update the inputs if costs or intended use change.
Open rent or own: cost model ↑One-bag weight planner
How much does this one bag weigh against its allowance?
Use measured weights and your actual carrier’s allowance for this bag. A weight calculation does not check dimensions, batteries, restricted items or sports-equipment policies.
- Check the allowance for the specific carrier, fare and bag. Keep the source and date in the carrier field.
- Weigh the empty bag, then group its contents without counting any item twice.
- Use kilograms throughout. Up to three decimal places lets you enter measured gram-level weights.
- Leave unweighed items blank. After packing, weigh the complete bag to catch missed items or measurement differences.
Worked example
A 3 kg bag with 12.5 kg equipment, 3 kg clothing, 1 kg footwear, 0.8 kg accessories and 0.2 kg other items weighs 20.5 kg. Against an entered 23 kg allowance, 2.5 kg remains.
Read the result carefully
Remaining weight does not confirm airline acceptance. Dimensions, item restrictions, batteries and separate sports-equipment rules still need checking with the carrier. This calculator models one bag, not pooled allowances.
Open one-bag weight planner ↑Group expenses and deposits
Who still owes what after shared costs and deposits?
Split a shared AUD total between up to four people, then add personal expenses and subtract payments already made. Enter a name to include someone. Extra cents are allocated in the displayed order.
- Enter the shared expenses once, then name each participating person. Unnamed rows are excluded and incomplete rows are flagged.
- Add each person’s own extras separately. Do not repeat costs already included in the shared total.
- Record payments already made by that person and explicitly enter zero where there are no extras or payments.
- Check the result together. The tool allocates leftover cents in the displayed order so the shared portions add up exactly.
Worked example
For $100 shared between Alex, Blair and Casey, the shares are $33.34, $33.33 and $33.33. If Alex has $10 personal expenses and has paid $20, Alex has $23.34 remaining. If Blair has paid $40 with no personal extras, Blair is $6.67 overpaid.
Read the result carefully
An overpayment describes the balance in this model. It does not process a refund or decide which person should reimburse someone. Keep receipts and agree which costs are shared before settling up.
Open group expenses and deposits ↑Diving unit converter
How do I read a measurement expressed in another unit?
Convert a measurement for reading and discussion. Converting a number does not make it a suitable operating limit.
- Choose the direction first: metres/feet, bar/psi or Celsius/Fahrenheit.
- Enter the value in the source unit shown by that direction. Negative inputs are accepted only for temperatures.
- Read the output unit as well as the number. Results display up to three decimal places.
- Keep the original value when copying information into notes so another reader can check the conversion.
Worked example
10 metres converts to 32.808 feet; 100 feet converts to 30.48 metres. 20 °C converts to 68 °F. These are measurement conversions only.
Read the result carefully
Rounding can affect the last displayed digit. A converted number does not establish an operating limit, training requirement or suitable dive plan.
Open diving unit converter ↑Saving and privacy
Entries save in your browser on this device. They are not sent to YouDive. Other people using the same browser may see them. Open My trips to download an editable backup or a readable trip pack before clearing browser storage or travelling without reception.
Questions about the results
Why does a blank amount show as unknown?
An absent price is not evidence that something is free. Enter zero only for an item confirmed as included or not required. Partial totals exclude unknown costs.
Does the cheapest course mean the best course?
No. Compare the exact course, training arrangement, supervision, assessment, equipment and support. The calculator totals entered costs and does not establish equivalence or eligibility.
Does a saved trip work without internet?
The website still needs a connection to load. Download the text trip pack or save a PDF before leaving reception. Browser storage is not offline website access.
Are these gas or decompression calculators?
No. These tools organise travel costs and measurements. They do not calculate gas reserves, dive profiles, decompression or personal fitness to dive.