Amount.si
The AI tutor for everyday quantities and conversions
Percentages, ratios, unit conversions, and estimation, explained step by step. Amount.si turns 'how much is that, really' into a clear, worked-through answer.
No card required · $9/mo Plus · $99/mo Premium
What you get
Everything Amount.si gives you
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Step-by-step math
Every answer shows its work, not just the result.
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Unit and currency conversions
Metric, imperial, cooking measurements, and more, explained.
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Real-world estimation practice
Learn to sanity-check quantities in daily life.
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Saved study history
Sign in free and keep every worked problem for later review.
Go deeper
Quantitative Literacy Knowledge Base
The conversion systems and math skills behind everyday quantities.
Conversion Systems
- Metric System — A base-10 system of units used for length, mass, and volume worldwide.
- Imperial and US Customary — Units like inches, pounds, and gallons still used in the US and UK.
- Cooking Measurements — Cups, tablespoons, and grams, and how they convert between recipes.
- Currency Conversion — How exchange rates work and why they shift day to day.
Everyday Math Skills
- Percentages — Calculating discounts, tips, tax, and rates of change.
- Ratios and Proportions — Scaling recipes, mixing solutions, and comparing quantities fairly.
- Estimation — Quickly sanity-checking a number without a calculator.
- Unit Rates — Comparing price-per-unit or speed to make better decisions.
Pricing
Simple plans that grow with you
Most popular
Plus
$9/mo
- ✓200 questions per day
- ✓Full saved conversation history
- ✓Worked-example conversion tables
Premium
$99/mo
- ✓Unlimited questions
- ✓Extended deep-dive answers
- ✓Everything in Plus