Put change in perspective.

Compare changes, recover original amounts, annualize growth and combine weighted figures with clear formulas.

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7 calculators

Measure an increase or decrease relative to a starting value.

Compare two non-negative values symmetrically using their average as the denominator.

Recover an original amount from the final amount and a known increase or decrease.

Show the absolute difference between rates alongside the relative percent change.

Find the constant annual growth rate connecting a positive start value to an ending value.

Combine values with different weights, quantities or shares in a single calculation.

Simplify a whole-number ratio and divide a chosen total between its two parts.

Each calculator includes a formula, worked example, assumptions and reference. Defaults are illustrative inputs, not recommended targets.