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Featured
Monthly payments, amortization, and total interest — with a breakdown that actually makes sense.
Health
Body mass index plus what it really means — and where it falls short.
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See how savings grow over time — daily, monthly, or yearly.
Math
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Most used
Mortgage Calculator
Finance · monthly payments, interest, full breakdown
BMI Calculator
Health · body mass index, metric + imperial
Compound Interest
Finance · watch savings grow over time
Calorie Calculator
Health · daily needs by age, weight, activity
Dog Pregnancy
Animal Pregnancy · gestation & due date
GPA Calculator
Education · current GPA or target projection
Percentage Calculator
Math · increases, decreases, differences
TDEE Calculator
Health · total daily energy expenditure
Showcase
Every result comes with the formula, a clear breakdown, and a plain-English read-out. No clutter, no waiting.
Finance · example
Home price
$320,000
Down payment
$64,000
Rate / Term
5.5% · 30y
Monthly payment
$1,454
Principal & interest on a $256,000 loan
Amortization · 30 years
M = P · [ i(1+i)ⁿ ] / [ (1+i)ⁿ − 1 ]
Transparent math
No black boxes. Every calculator shows the exact formula it used — so you can check it, trust it, and actually learn it.
Browse the calculators ›# Markup
Markup % = ((Price − Cost) / Cost) × 100
# Profit margin
Margin % = ((Price − Cost) / Price) × 100
# Body mass index
BMI = weight(kg) / height(m)²
# Mortgage payment
M = P · [ i(1+i)ⁿ ] / [ (1+i)ⁿ − 1 ]Why us
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Finance · 8 min
Most people guess, or copy what HR suggested. Here’s how to find the right number for your situation.
Health · 7 min
BMI is quick but tells only part of the story. We compare both so you know which to trust.
Finance · 7 min
Contribution limits, tax treatment, employer match — which account fits your situation.
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