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Loan calculator
Estimate fixed monthly payments, total interest, and payoff time, then see how extra payments could change the loan.
- Monthly payment
- Extra payments
- Amortization
Plain Finance Tools
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Free calculators that keep the assumptions visible. Explore a scenario, inspect the formula, and separate your money from estimated interest.
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Financial calculators
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Fixed term
Fixed-term saving
CD calculator
Estimate maturity value and interest from an opening deposit, APY, and term, or compare a second CD offer.
- Maturity value
- Offer comparison
- Interest milestones
Planning
Saving
Savings goal calculator
Find the recurring amount needed by a deadline, or estimate when your current saving plan could reach its goal.
- Amount needed
- Time to goal
- APY growth
Growth
Compound growth
Compound interest calculator
Project a starting amount and regular deposits, then separate everything you contributed from estimated interest.
- Flexible deposits
- Frequency controls
- Annual schedule
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Calculators and guides that work together
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Borrowing
Understand a loan before comparing payments
Estimate the required payment, follow the balance through amortization, and test recurring extra principal.
Open the loan calculator Browse loan guidesSaving goals
Turn a target into a contribution plan
Solve for the amount to save or the time a recurring plan may need, using one visible set of assumptions.
Open the savings goal calculator Browse savings guidesCertificates of deposit
Compare fixed-term deposit assumptions
Estimate maturity value, separate deposit from interest, and compare APY, term, and opening balance.
Open the CD calculator Browse CD guidesCompound growth
See how deposits, time, and rate interact
Project a starting balance and recurring deposits, then separate contributions from estimated growth.
Open the compound interest calculator Browse compound interest guidesBuilt for clarity
The result is only useful when the assumptions are clear.
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The method is inspectable
Every calculator explains its formula, timing assumptions, examples, and limitations.
Estimates stay estimates
Fixed-rate scenarios help you explore a plan. They are not forecasts, guarantees, or financial advice.
Learning center
Understand the inputs before trusting the output.
Use the complete guide library to move from a financial question to a reproducible example.