Sound absorption converter

The browser tool runs free on your device; the prepaid API charges $0.002 per successful item when acoustic pipelines need the same contract from servers and automation.

Supported units and how absorption conversion is computed

Factors follow the exact international foot: one foot is exactly zero point three zero four eight metres, so one square foot is exactly zero point zero nine two nine zero three zero four square metres, and one square yard is exactly zero point eight three six one two seven three six square metres. Because the intermediate is always metric sabins, converting A to B and B to A is consistent up to the published rounding of twelve decimal places, and there is no pairwise matrix that can drift out of sync. Material absorption coefficients, room volumes, and reverberation formulas are intentionally out of scope so laboratory and design users get predictable unit conversion under one clear SI-foot convention. The converter accepts six absorption families under stable canonical codes: sabin for the imperial or English sabin, metric_sabin for the metric sabin, m2 for square metres of absorption, ft2 for square feet of absorption, cm2 for square centimetres, and yd2 for square yards. Friendly aliases such as sabins, imperial sabin, metric sabins, square metre, square meter, square foot, square feet, sq m, sq ft, and common hyphen or underscore spellings are normalized case-insensitively so forms and APIs can pass either short codes or full names. By definition one imperial sabin equals the absorption of one square foot of a perfectly absorbing surface, and one metric sabin equals the absorption of one square metre of a perfectly absorbing surface; therefore sabin and ft2 share the same magnitude factor, and metric_sabin and m2 share magnitude one. Every request multiplies the input value by the exact metric-sabins-per-unit factor for the source, then divides by the factor for the target.

Request shape, response fields, and unknown-unit errors

The error message names the bad field and lists the supported set so clients can correct forms without guessing. Negative values are allowed when you need signed absorption deltas in engineering pipelines; zero converts cleanly to zero in every target unit. Send a JSON body with three required fields: value as a finite number, from as the source unit string, and to as the target unit string. Aliases amount, quantity, and absorption are accepted for value; unit_from and source for from; unit_to and target for to. On success the response echoes the canonical from and to codes, human-readable from_label and to_label strings, the converted result, the intermediate metric_sabins quantity, the dimensionless factor from source to target, a short formula line suitable for UI display, the method tag sound_absorption_si_foot, and the fixed list of units_supported. Missing value, non-finite numbers such as NaN or Infinity, missing unit fields, and any token that does not map to a supported unit fail with invalid_input and are not charged after the engine rejects the request. Identical inputs always yield identical JSON because the path is pure arithmetic with no randomness, no remote lookup, and no dependence on the wall clock, which makes the endpoint safe to pin in continuous-integration goldens and SDK contract tests. Extremely large magnitudes are rejected above a published safety cap so Worker isolates stay bounded while still covering every practical room-acoustic inventory.

Browser use, API pricing, and everyday acoustic workflows

Switch to the prepaid API when an acoustic consultancy tool, auditorium design app, classroom HVAC noise pipeline, material catalogue, or homework checker must convert absorption areas at scale under a stable KIT contract at $0.002 per successful item; validation failures that raise invalid_input do not consume balance after rejection. Pair this endpoint with sound-pressure level conversion when a product pipeline needs both absorption area and decibel SPL, or call it alone when search traffic is specifically for sabins, metric sabins, and square metres of absorption rather than a general unit switchboard.