Meta-Calculators Calculators — Australia
Calculators about calculating. When one number is not enough — because the inputs are uncertain, or there are several futures, or several options — these are the tools that turn a spread of possibilities into something you can decide on.
Scenarios & projections
Scenario Comparison Calculator
Compare up to five named scenarios with probabilities — the expected value, the best and worst cases, the spread, and how much of the expected value the single most likely scenario carries.
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What-If Change Calculator
Change several inputs at once and see the combined effect on a result — each change on its own, and all of them together, which is not the same as adding them up.
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Multi-Year Projection Calculator
Project a value over many years at a growth rate — with an optional step change part-way through, the doubling time, and the year a target is reached.
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Weighted Scoring Calculator
A decision matrix — score up to four options against up to six weighted criteria, and see which wins, by how much, and whether changing one weight would flip it.
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Uncertainty & sensitivity
Monte Carlo Simulation Calculator
Run a Monte Carlo simulation on up to three uncertain inputs, each given as a minimum, most likely and maximum — and read off the mean, the P10, P50 and P90, and the chance of clearing a target.
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Sensitivity Analysis Calculator
A one-at-a-time sensitivity analysis — swing each input across its range while holding the others at base, and rank them by how far the result moves.
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Assumption Chain Calculator
Multiply a chain of assumptions — a market size, a reach, a conversion, a retention — into one number, and see which link would move the result most if it were 20% wrong.
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About these calculators
These work on numbers you supply and make no assumptions about what the numbers mean, so the same page serves a business case, a research estimate or a household decision. The Monte Carlo and scenario tools are seeded from your inputs, so a result is reproducible: change nothing and you get the same answer.