How we verify our calculators
Every calculator on dincalculator.com is built directly from the official standard or manufacturer specification it cites. We do not invent formulas or rely on unverified sources.
Before any calculator is published, we verify it against the original source: running test cases through the official lookup tables and checking edge cases at minimum and maximum input values.
The standards we use are publicly available documents from recognised international bodies. Where a standard is updated, we update the calculator to match.
If you find an error in any calculation, please contact us. We treat accuracy corrections as the highest priority.
Standards and sources
Three things can be true of a row above, and the wording says which. A standard covers this: a published document settles the question and this site cites it by title. A standard exists but does not settle it: a standard exists and is named, but it does not answer what the calculator answers, which is the case for helmet sizes, bicycle weight limits, climbing gear ages and goggle lens categories. Nobody publishes this, the figures are ours: nobody publishes it, the figures are this site’s own convention, and the calculator page says so in its own words.
Calculator risk tiers
Not all calculators carry the same consequences if the result is wrong. We classify every calculator into one of three tiers and display a matching safety notice on the page.
Examples: Ski size, paddle length, swim pace, tyre pressure
An incorrect result means a suboptimal equipment choice. There is no direct safety risk. These calculators show a brief reference note.
Examples: MTB suspension, ski binding DIN, backpack weight
An incorrect result could affect control or cause injury. These calculators show a visible warning and recommend verification with a qualified technician or instructor.
Examples: Diving NDL, freediving tables, avalanche (future)
An incorrect result or misuse could cause serious injury or death. These calculators display a prominent warning before the form and require the user to acknowledge that a certified course and professional supervision are necessary.
When to consult a professional
Ski bindings
Always have your final DIN setting verified by a certified ski technician with a calibrated binding tester. A calculator gives you the correct value. A technician confirms it is applied correctly.
Scuba diving
Never dive based on a calculator alone. Dive with a calibrated dive computer and always within the limits of your certification. If you are new to diving, complete a certified course (PADI / SSI / CMAS) before entering open water.
Freediving
Never practise breath-hold diving alone. The buddy system is not optional: shallow water blackout occurs without warning. Complete a certified freediving course before attempting pool or open water breath-hold training.
MTB suspension
Starting values from a calculator give you a baseline. Fine-tune by riding and making small adjustments. If you are unsure, a bike shop with suspension expertise can set up your fork and shock in 30 minutes.
Avalanche terrain (future calculator)
A calculator cannot replace on-site snow assessment. Always check the local avalanche bulletin (EAWS), carry a beacon, probe and shovel, and complete an avalanche safety course before touring in the mountains.
Found an error?
Despite careful verification, errors can occur. If you find a calculation that produces a result which does not match the official standard or manufacturer specification, we want to know immediately.
Please include:
- The calculator URL
- The inputs you used
- The result you received
- The correct result and its source
Accuracy corrections are treated as the highest priority and addressed before any new feature work.