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Everyday Math Calculator
Everyday arithmetic, reviewed October 2026 — exact for the inputs typed, not a substitute for certified measurement or medical advice.
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Percentage change is (new − old) ÷ old × 100, always measured against the starting value. 100 → 150 is +50%, while the return trip 150 → 100 is −33.33% — a positive result is a rise, a negative one a fall. Price moves, exam marks, salary hikes, and any before/after pair read correctly with the sign attached.
Put the earlier figure in Old and the later one in New; swapping them flips the answer because each direction uses its own base. The classic trap: up 50% then down 50% does not return to start (150 → 75), since the fall applies to the larger number. Chain multi-step changes sequentially instead of adding percents.
It does not work from a zero starting value, annualise multi-year moves into a CAGR, or separate quantity from price effects — for growth-rate comparisons across years, use the CAGR calculator.
Needs a non-zero starting value.
Because each is measured against its own starting value. Going up then down by the same percentage does not return to the original number.
No — dividing by a starting value of zero is undefined, so percentage change needs a non-zero old value.
This covers one jump between two values; CAGR spreads growth evenly across years. Use this for single moves, CAGR for multi-year comparisons.
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