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比率計算機

Ratio calculator: solve missing term from known ratios with cross-multiplication for recipes, scaling and allocation, with one-click copy, offline and multilingual.

使い方

a、b、c の値を入力し、計算モードを選択。結果と式がリアルタイム表示。

Overview

Ratio Calculator is a Math tool. Solve missing term from known ratios with cross-multiplication for recipes, scaling and allocation, with one-click copy, offline and multilingual. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

  • Daily use of Ratio Calculator: Enter a, b and c, choose a mode. The result and formula update live. — enter and get instant results without manual lookup.
  • One-click copy keeps results ready to save, check or share with family and pros.
  • Use Ratio Calculator offline or on poor network — all calculations stay local and private.
  • Geometry solving
  • Combinatorics and EV

How to use

  1. 1 Enter a, b and c, choose a mode. The result and formula update live..
  2. 2 See step-by-step derivation
  3. 3 Switch precision/display
  4. 4 Save frequent formulas

Highlights

  • Local & private: processing stays in your browser
  • Live validation with tolerant parsing
  • One-click copy and export for docs, code or sheets
  • Batch and offline support under poor network

Notes

  • Use high-precision mode for big numbers
  • Floating errors are denoised but verify extremes
  • Small samples fluctuate

FAQ

Fractions?
Type 3/4 to calculate as fraction.
Formulas reliable?
Standard formulas with sources shown.
How is Ratio Calculator different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “ratio calculator, a:b” and one-click copy for reuse.
Can I use results in official reports?
Use it as a working draft and cross-check with authoritative sources; keep the exported log and parameters for traceability.
Tip：Tip: Bookmark this page or pin the tab; find related tools via categories and search.
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すべての計算はブラウザ内で実行され、データはアップロードされません。