Free ToolsRule of 72: Estimate Doubling Time Fast
Rule of 72 explained: how to estimate how long an investment takes to double, worked examples, how accurate it is, and the practical ways to use it.
Bullynx Editorial Team · Jul 7, 2026 · 5 min read
Topic · 9 guides
Free Tools
Guides to the free calculators on Bullynx: risk-reward, position size, stock averaging, pip value, and how to fold them into a repeatable pre-trade checklist.
Free ToolsFree ToolsBreakeven Price: How to Calculate It
How to calculate breakeven price on a trade: the formula including fees, how averaging down moves it, and a worked example for stocks and positions.
Bullynx Editorial Team · Jul 1, 2026 · 6 min read
Free ToolsHow to Calculate Profit and Loss on Trades
How to calculate profit and loss on trades: the formula for longs and shorts, accounting for fees and slippage, and a worked example with numbers.
Bullynx Editorial Team · Jun 30, 2026 · 6 min read
Free ToolsPip Value Explained: Forex Sizing Made Easy
Pip value explained: what a pip is, the formula to calculate pip value by currency pair and lot size, a worked example, and how it drives position sizing.
Bullynx Editorial Team · Jun 28, 2026 · 6 min read
Free ToolsHow to Calculate Position Size Correctly
Learn how to calculate position size step by step: the risk-based formula, a worked example, forex and crypto units, and the common errors to avoid.
Bullynx Editorial Team · Jun 28, 2026 · 7 min read
Free ToolsStock Average Calculator: How to Average Down a Position
A stock average calculator finds your weighted average cost basis. See the formula, a worked averaging-down example, and the pitfalls of lowering your average.
Bullynx Editorial Team · May 24, 2026 · 6 min read
Free ToolsCompound Interest in Trading: Formula and Calculator Guide
How compound interest works in trading and investing: the formula, a worked example, the compounding curve, and why drawdowns hurt compounding the most.
Bullynx Editorial Team · May 22, 2026 · 6 min read
Free ToolsRisk Reward Ratio Explained: Formula and Breakeven Win Rate
Risk reward ratio explained: the formula, what a good ratio looks like, and the breakeven win rate each ratio needs. Worked examples and common pitfalls.
Bullynx Editorial Team · May 20, 2026 · 7 min read
Free ToolsPosition Size Calculator: How to Size a Trade by Risk
A position size calculator turns your account risk, entry, and stop into the exact number of shares to trade. See the formula, a worked example, and pitfalls.
Bullynx Editorial Team · May 19, 2026 · 7 min read