Day-Count Convention Comparator
Days and year-fractions between two dates under 30/360, ACT/360, ACT/365 and ACT/ACT — see how much the convention itself moves interest.
Formula
On ₹1 crore at 6% a six-month period can differ by thousands purely from the day-count clause. Loan agreements, swaps and bonds each default to different conventions — this comparator quantifies exactly what signing one vs the other costs.
Not financial advice — for informational and analytical use only. Verify all figures with a qualified professional before acting on them.
Need day-count convention comparator results fast? Analysts, founders, traders and finance professionals use the Day-Count Convention Comparator to skip the spreadsheet and get a defensible answer in one step — free, private and instant.
About Day-Count Convention Comparator
Days and year-fractions between two dates under 30/360, ACT/360, ACT/365 and ACT/ACT — see how much the convention itself moves interest. On ₹1 crore at 6% a six-month period can differ by thousands purely from the day-count clause. Loan agreements, swaps and bonds each default to different conventions — this comparator quantifies exactly what signing one vs the other costs. The governing relationship is 30/360: (Y₂−Y₁)·360 + (M₂−M₁)·30 + (D₂−D₁), D capped at 30. The Day-Count Convention Comparator computes entirely in your browser — free, private (your figures never leave your device) and instant, recalculating live as you change any input.
How to use Day-Count Convention Comparator
- 1Enter Start year, Start month, Start day, End year, End month, End day into the Day-Count Convention Comparator.
- 2The result is computed automatically using 30/360: (Y₂−Y₁)·360 + (M₂−M₁)·30 + (D₂−D₁), D capped at 30 — there is no button to press.
- 3Change any input to model a different scenario, then copy or share the result.
Why use Day-Count Convention Comparator?
- ✓Computes day-count convention comparator instantly with the correct formula — no spreadsheet needed
- ✓100% free and unlimited, with no sign-up, login or paywall
- ✓Runs entirely in your browser, so the figures you enter stay private
- ✓Shows the formula, a live worked example and references so you can defend the number
Frequently asked questions
What is the formula behind the Day-Count Convention Comparator?+
Day-Count Convention Comparator uses 30/360: (Y₂−Y₁)·360 + (M₂−M₁)·30 + (D₂−D₁), D capped at 30. On ₹1 crore at 6% a six-month period can differ by thousands purely from the day-count clause. The tool substitutes your actual inputs into this relationship and shows the worked example step by step.
What inputs does the Day-Count Convention Comparator need?+
Enter Start year, Start month, Start day, End year, End month, End day and the result updates immediately — there is no button to press. Change any value to model a different scenario in real time.
Is the Day-Count Convention Comparator free, and is my data private?+
Yes — it is completely free with no sign-up or usage limit, and it runs entirely in your browser, so the numbers you enter are never uploaded or stored on any server. It is for informational and analytical use, not financial advice.
What should I watch out for when using the Day-Count Convention Comparator?+
Loan agreements, swaps and bonds each default to different conventions — this comparator quantifies exactly what signing one vs the other costs.
What is the Day-Count Convention Comparator based on?+
The method follows authoritative sources: ISDA 2006 Definitions §4.16 — day count fractions. The formula and references are shown on the page so you can verify and cite the result.
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