# What is 30% of 300? — Percentage Calculator

> Calculate 30% of 300 instantly — the answer is 90. Plus percentage change, percentage difference, and add or subtract a percent, with step-by-step formulas.

- **Answer:** 90
- **Category:** Math
- **Interactive calculator:** https://youcalc.com/en/math/percentage/30-percent-of-300/
- **Price:** Free, no sign-up required
- **Full calculator:** [Percentage Calculator](https://youcalc.com/en/math/percentage/)
- **Pre-filled inputs:** `of=30%2C300`

| Metric | Value |
| --- | --- |
| Percentage | 30% |
| Of | 300 |
| Result | 90 |


## Overview

30% of 300 is 90. The easiest path is to find 10% (move the decimal one place: 30) and multiply by 3, giving 90. As a decimal it is 0.30 × 300 = 90. Try any percentage and number in the calculator below.

## Method

Each mode uses a direct formula. "What is X% of Y" computes (X / 100) × Y. "X is what % of Y" computes (X / Y) × 100, requiring Y ≠ 0. "X is P% of what" solves for the base as X / (P / 100), requiring P ≠ 0. Percentage change is ((new − old) / |old|) × 100, signed, requiring the old value ≠ 0. Percentage difference is |A − B| / ((|A| + |B|) / 2) × 100, order-independent, requiring the two values not both be zero. "Add / subtract a percent" gives base × (1 + p / 100) and base × (1 − p / 100). All formulas follow standard mathematical definitions as documented on MathIsFun.

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## Sources

- https://www.mathsisfun.com/percentage.html
- https://www.mathsisfun.com/numbers/percentage-change.html
- https://www.mathsisfun.com/percentage-difference.html

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Interactive version: https://youcalc.com/en/math/percentage/30-percent-of-300/ · From YouCalc — https://youcalc.com