Instant calculators for life's biggest decisions.
Free calculators for mortgages, salaries, solar power, electric vehicles and construction projects.
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Pick a tool below to get instant, accurate results.
Mortgage Repayment Calculator
Estimate monthly repayments, total interest and the impact of extra repayments.
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Solar Payback Calculator
Work out annual savings, payback period and 20-year returns on a solar system.
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Salary After Tax Calculator
Calculate take-home pay and effective tax rate across multiple countries.
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EV vs Petrol Cost Calculator
Compare the running costs of electric and petrol vehicles over five years.
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Concrete Volume Calculator
Calculate the cubic metres, cubic feet and bags of concrete you need.
Open calculatorAbout Instantora
Instantora is a growing collection of free online calculators and decision-making tools. Every calculator is built to be fast, accurate and genuinely useful, so you can make confident decisions in seconds.
Completely free
Every calculator is free to use, with no hidden costs.
Instant results
Calculations update live as you type. No waiting, no reloads.
No signups
Use any tool right away. We never ask you to create an account.
Mobile friendly
Designed mobile-first so it works beautifully on any device.