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Everyday Legal Arithmetic Center

User-entered payment schedules, ownership shares, document amounts and time-unit arithmetic. 20 tools with purposes, formulas and worked examples.

Simple mode uses starting defaults for extra scenario controls. Advanced exposes those controls where available. Change an entry, then press Calculate.

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Formula, calculation steps & example

All 20 tools: purposes and formulas

Ownership share percentage — Use the labeled measurements to calculate ownership share percentage.
A ÷ B × 100 (A, B, C refer to the labeled entries)
Entered ownership value share — Use the labeled measurements to calculate entered ownership value share.
A × B (A, B, C refer to the labeled entries)
Equal amount division — Use the labeled measurements to calculate equal amount division.
A ÷ B (A, B, C refer to the labeled entries)
Equal payment count — Use the labeled measurements to calculate equal payment count.
ceiling(A ÷ B) (A, B, C refer to the labeled entries)
Scheduled equal payments total — Use the labeled measurements to calculate scheduled equal payments total.
A × B (A, B, C refer to the labeled entries)
Balance after entered payments — Use the labeled measurements to calculate balance after entered payments.
A − B (A, B, C refer to the labeled entries)
Documented simple-interest scenario — Use the labeled measurements to calculate documented simple-interest scenario.
A × B × C (A, B, C refer to the labeled entries)
User-entered percentage fee — Use the labeled measurements to calculate user-entered percentage fee.
A × B (A, B, C refer to the labeled entries)
Deposit as amount share — Use the labeled measurements to calculate deposit as amount share.
A ÷ B × 100 (A, B, C refer to the labeled entries)
Entered refundable amount less entered fees — Use the labeled measurements to calculate entered refundable amount less entered fees.
A − B (A, B, C refer to the labeled entries)
Proportional allocation — Use the labeled measurements to calculate proportional allocation.
A × B (A, B, C refer to the labeled entries)
Logged professional time cost — Use the labeled measurements to calculate logged professional time cost.
A × B (A, B, C refer to the labeled entries)
Entered expense total — Use the labeled measurements to calculate entered expense total.
A + B + … (A, B, C refer to the labeled entries)
Specified percentage of amount — Use the labeled measurements to calculate specified percentage of amount.
A × B (A, B, C refer to the labeled entries)
Amount multiplier from document — Use the labeled measurements to calculate amount multiplier from document.
A × B (A, B, C refer to the labeled entries)
Obligation paid percentage — Use the labeled measurements to calculate obligation paid percentage.
A ÷ B × 100 (A, B, C refer to the labeled entries)
Specified total less allocations — Use the labeled measurements to calculate specified total less allocations.
A − B (A, B, C refer to the labeled entries)
Elapsed calendar days — Count date-only intervals using explicit endpoint conventions.
Days = end date − start date.
Calendar days including both dates — Count date-only intervals using explicit endpoint conventions.
Days = end date − start date + 1.
Monday–Friday days including both dates — Count date-only intervals using explicit endpoint conventions.
Count Monday–Friday dates in the inclusive interval.

Definitions and source references

Unit definitions and selected model references:

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