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loan · emi · amortization · local

Calculate your loan EMI

Standard EMI formula gives the monthly payment for any loan. The amortization preview shows how much of the first year goes to interest vs principal.

Loan EMI Calculator
Monthly EMI
2,013.98
payment
Total paid
483,355.92
240 months
Total interest
233,355.92
7.5% APR
Principal
250,000.00
borrowed
Quick terms (mo)
input · loan terms

EMI = P · r · (1+r)n / ((1+r)n − 1) where r is monthly rate.

output · amortization (first 12 months)
MonthInterestPrincipalBalance
11,562.50451.48249,548.52
21,559.68454.30249,094.21
31,556.84457.14248,637.07
41,553.98460.00248,177.07
51,551.11462.88247,714.19
61,548.21465.77247,248.42
71,545.30468.68246,779.74
81,542.37471.61246,308.13
91,539.43474.56245,833.57
101,536.46477.52245,356.05
111,533.48480.51244,875.54
121,530.47483.51244,392.03
Quick Start

How EMI works

An EMI is a fixed monthly payment of principal + interest. Early on most of it is interest; the principal share grows each month.

  1. 01

    Enter principal

    The loan amount.

    Inputs are treated as UTF-8 throughout the pipeline and validated client-side as you type — nothing dispatches until the value is well-formed.

    Pinpututf-8client-sidevalidated
    P · text$250k · set
    $250,000
    loaded · parsedclient-side
  2. 02

    Annual rate

    APR as %. Monthly rate = APR / 12.

    Each toggle re-computes through a memoised hook, so flipping options never resets your input and the UI stays snappy on large inputs.

    roptionslivememoisedtoggles
    r · memoised7.5% · live
    0.625%/mo
    options set · memoisedlive
  3. 03

    Term in months

    120 = 10y, 240 = 20y, 360 = 30y.

    Randomness — where used — comes from crypto.getRandomValues, never Math.random. Heavy work sits in useMemo.

    ncomputeinstantlocaldeterministic
    n · instant240 · computed
    20 years
    computed · instantinstant
  4. 04

    Read result

    EMI plus first-year amortization shown live.

    Copy writes through navigator.clipboard and downloads use a Blob — zero network traffic. Same input plus same options always yield the same bytes.

    readcopydownloadzero-networkreproducible
    ok · copiedready · copied
    $2,014/mo
    shipped · ready to shipsuccess
Pro tips

Pro tips for everyday utilities

Reach for crypto.getRandomValues

Cryptographically random for IDs, tokens, salts. Math.random is for animation and games, not security.

Sort IDs lexicographically

UUID v4 has no time ordering. Use ULID or UUID v7 if you need sorted IDs.

Mock data with seeds

Faker-style libraries can be seeded so tests are reproducible. Embed the seed in the fixture file.

Reference cards beat memory

Cheatsheets for Vim, Git, Docker, Linux signals are faster than man pages when you’re mid-flow.

Browser APIs vary

Touch events, gamepads, and clipboard differ across vendors. Feature-detect before use.

Persist in the right place

localStorage for user preferences, sessionStorage for transient state, IndexedDB for structured data.

Related toolsCompound InterestPercentageDiscountTipCurrencyCurrency Format
Use Cases

When to model an EMI

Home, car, education loans.

Home loans

Mortgages and refinances. Random values come from crypto.getRandomValues — cryptographically secure for tokens, salts, and session IDs. Math.random is deterministic enough for animations but predictable enough to be a security bug.

CSPRNG-backed

Car loans

Compare 36 vs 60 vs 72 month terms. Pair with hashids, ULID, or UUID v7 when you need both random and sortable — useful for primary keys, public-facing IDs, and event log ordering without a sequence column.

reproducible

Education loans

See total interest over a 10-year repayment. Output is deterministic given the same seed, so fixtures and tests stay reproducible across CI runs and contributor machines. Embed the seed in the fixture file for full replay.

snappy

Refinancing

Compare current vs proposed terms. Heavy work runs through useMemo so the UI stays snappy on large inputs. Same input + same options yields identical bytes — the kind of stability snapshot tests rely on.

feature-detected

Pre-purchase planning

Set a budget before talking to a lender. Storage tools persist to the right backend: localStorage for user preferences, sessionStorage for transient state, IndexedDB for structured data. Pick the right shelf and quota worries disappear.

deterministic

Loan comparisons

Side-by-side scenarios across rates. Browser feature detection: clipboard, fullscreen, gamepad, and Web Bluetooth APIs gracefully fall back when unavailable. No surprise white screens on Safari or older Firefox.

production-ready
FAQ

Frequently asked questions

Equated Monthly Installment — a fixed monthly payment that includes both interest and principal.
The principal + interest part, yes. Property tax, insurance, and PMI are added separately by your lender.
Interest accrues on the remaining balance. Early on the balance is the entire principal; as it shrinks, interest does too.
We handle the zero-rate edge case explicitly — EMI = principal / months.
Yes — all math runs in your browser. Nothing is sent to a server.
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