Review Carpet Purchase Length for a Straight Stair

Derive equal stair risers and treads,then review runner purchase length and area at supplied allowances,waste and sale increment with both reports.

• Choose JSON:totalRiseMetres,maximumRiserMetres,goingMetres as numeric STRING fields. Source4KiB/1024units;single-line fields128units. Original equal-riser layout has2-1000risers;treads=risers-1,upperfloor final landing. Native going is the carpet horizontal tread path;actual riser/going convert m tocm without rounding. Enter runner width,additional landing,per-tread/end allowances,waste and sale increment. Original exact decimal path/waste/purchase ceiling retained. Invalid carpet assumptions or derived ranges keep the full geometry checkpoint. Both full reports,raw source,args and projection operands remain unredacted. ZIP256KiB/expanded128KiB/member64KiB. No curved/winder stairs,pattern repeat,seam optimization,nosing geometry,underlay,material selection,installation,building-code,headroom,stringer,structural,safety or measured-fit recommendation. Original30sworkers;90sstages.
• Original risers=max(2,ceil(exact entered rise/maximum)),with original1billion rounded-count bound and final max1000risers. Treads=risers-1,upperfloor is final landing. ActualRiserM=Number(totalRise)/risers,totalRunM=treads*Number(going). Step pitch=atan2(actualRiserM,goingM)*180/Math.PI;floor-to-floor diagonal=Math.hypot(totalRiseM,totalRunM). Retain all9nativefields in original order. No legal maximumriser/going recommendation,headroom,nosing,stringer cutting or safety certification.
• Read actual complete original geometry report. Pass treads=String(actual native treads),risers=String(actual native risers),depth=String(actual goingM*100),rise=String(actual actualRiserM*100) to original carpet estimator. Explicit binary64 metres-to-centimetres conversions use actual native values,not reconstructed source lexical decimals. Record all four native operands,100conversionfactor,operation and resulting strings. No rounding,clamp,count/dimension override or alternative geometric algorithm. Valid geometry whose derived centimetres exceed original consumer ranges keeps full CP/refuses.
• Six explicit original carpet controls match standalone defaults:runner width80cm,additional landing length100cm,per-tread allowance2cm,total end allowance30cm,extra material5%,roll sale increment0.5m. These are supplied assumptions,not an installation recommendation or inferred landing. Source example rise2.9m/maximumriser0.185m/going0.27m is an illustration, not a building-code compliance claim. Original standalone defaults unchanged.
• Original treads/risers whole0..10000,positive depth/rise/runnerwidth1e-12..1e12cm,nonnegative landing/stepExtra/endExtra0..1e12cm,waste0..100,positive saleincrement1e-12..1e12m. Exact rational pathCm=treads*(deriveddepth+stepExtra)+risers*derivedrise+landing+endExtra;pathM=pathCm/100,required=pathM*(1+waste/100),saleIncrements=ceil(required/increment)0..1e9. Original descriptive Number(numerator)/Number(denominator) path/required and percentage operation order retained;purchasedLength=steps*saleIncrementNumber,purchasedArea=purchasedLength*runnerWidthNumber/100. All15 native fields retained. No float-only retail ceil,arbitrary rounding/reassociation or alternate geometry. Extreme exact rationals can trigger original nonfinite descriptive-report refusal even with finite scalar Number inputs;keep CP.
• straight-stair-geometry-checkpoint.zip3members:source/stair-input.json exactraw,stair/stair-geometry-calculator.json full9fieldnative,stair/manifest.json complete original args/source/report metadata/policy. Role straight-stair-geometry-source. Whole source-to-native association validated against unchanged original pure geometry using actual new source;not old processing replay.
• straight-stair-carpet-purchase-review.zip6members:threeCPmembers unchanged;carpet/calculator-input.json actual all-string original args treads,risers,depth,rise,width,landing,stepExtra,endExtra,waste,increment;carpet/stair-carpet-estimator.json complete15fieldnative;manifest.json settings/checkpoint hash/full actual counts/metre-to-cm projection operands/argstrings/metadata/policy. ZIP262144bytes/expanded131072/member65536/6entries;whole member/order/CRC independent,no Deflate/time/authenticity comparison.
• Declared straight single-flight equal-riser geometry only;upperfloor final landing,treads=risers-1. Additional landing run/width/allowances/waste/sale unit explicitly supplied. No curved/winder stairs,pattern repeat,seams,underlay/adhesive,material/product selection,installation instructions,building-code/headroom/nosing/stringer/structural/safety certification. Actual native binary64 dimension-to-cm conversion preserved;not source-token exact-equivalence or measured-fit guarantee. Original exact purchasing ceilings use derived argument strings. Full rawsource/args/both reports unredacted;no secure-erasure guarantee. Original30sworkers,owned90sstages/singleflight/Cancel/reset;consumer errors/Cancel keep full geometryCP and source.